Backdoor.Win32.REMCOS.USMANEAGGC
Windows
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
1,152,679 bytes
EXE
Yes
17 Apr 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:
- %User Temp%\bin\loaddrv.exe starttype giveio auto
- %User Temp%\Goldie.exe
- %System%\cmd.exe /c "COPY /Y /B "{malware file path and name}" "%Application Data%\Macromedia\netbtugc.exe""
- %System%\cmd.exe /c "COPY /Y /B "%User Temp%\2624bccb.lnk" "%User Startup%\netbtugc.lnk""
(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).. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)
It creates the following folders:
- %User Temp%\cgi-exe
- %User Temp%\webmasters\dealer
- %Application Data%\swfobject.js\special
- %User Temp%\webmasters
- %Application Data%\folder
- %Application Data%\swfobject.js
- %User Profile%\AppData
- %Application Data%\discovery\software
- %User Temp%\cgi-exe\xdb
- %Application Data%\system
- %User Temp%\blogspot
- %System Root%\Users
- %Application Data%\discovery
(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).. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Autostart Technique
This Backdoor drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\netbtugc.lnk
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)
Other System Modifications
This Backdoor deletes the following folders:
- %User Temp%\nss6578.tmp
(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).)
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Remcos-0AYDT9
exepath = "{random characters}"
HKEY_CURRENT_USER\Software\Remcos-0AYDT9
licence = "2634B4BC88ABED7A16B000348886CE5C"
Dropping Routine
This Backdoor drops the following files:
- %User Temp%\TowbarHamartia.dll
- %Application Data%\swfobject.js\special\sgen.exe
- %Application Data%\folder\x-vorbis+ogg.xml
- %Application Data%\folder\gutils.dll
- %Application Data%\discovery\software\18.opends60.dll
- %User Temp%\webmasters\dealer\metade.dll
- %User Temp%\Keystroke
- %User Temp%\2624bccb.lnk
- %User Temp%\webmasters\dealer\23.opends60.dll
- %Application Data%\discovery\software\normalization.dll
- %Application Data%\folder\rfc822.xml
- %Application Data%\folder\gtkwidgets.xml
- %User Temp%\webmasters\dealer\vjswebmigrationui.dll
- %Application Data%\folder\4.opends60.dll
- %Application Data%\folder\easthaven.xml
- %User Temp%\webmasters\dealer\VWDFormatOptions.xml
- %User Temp%\blogspot\VSLauncherUI.dll
- %User Temp%\cgi-exe\xdb\StatusNotifierWatcher.xml
- %Application Data%\folder\vcpropertymanagerui.dll
- %Application Data%\discovery\software\dpx.xml
- %User Temp%\webmasters\dealer\lc.exe
- %User Temp%\webmasters\dealer\isabel.xml
- %Application Data%\folder\x-dsl.xml
- %Application Data%\folder\model24.xml
- %Application Data%\system\logs.dat
- %User Temp%\Goldie.exe
- %Application Data%\discovery\software\model86.xml
- %Application Data%\discovery\software\62.opends60.dll
- %Application Data%\folder\pidgen.dll
- %Windows%\Tasks\netbtugc.job
- %Application Data%\folder\vnd.palm.xml
- %Application Data%\folder\vcencbld.dll
- %User Temp%\webmasters\dealer\vshost32.exe
- %Application Data%\folder\OfficeDevTechFilter20.xml
- %User Temp%\webmasters\dealer\jbimpui.dll
- %Application Data%\Macromedia\netbtugc.exe
- %Application Data%\folder\almsgs.dll
- %User Temp%\webmasters\dealer\org.gnome.evolution-data-server.calendar.gschema.xml
- %Application Data%\discovery\software\38.opends60.dll
- %Application Data%\discovery\software\dumpbin.exe
- %Application Data%\discovery\software\savedqueryheaders.xml
- %User Temp%\webmasters\dealer\rsnewfield.xml
(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).. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
Other Details
This Backdoor connects to the following possibly malicious URL:
- http://dominoduck2088.{BLOCKED}s.org
This report is generated via an automated analysis system.
SOLUTION
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
Restart in Safe Mode
Step 3
Identify and terminate files detected as Backdoor.Win32.REMCOS.USMANEAGGC
- 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.
- 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.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 4
Delete this registry value
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_CURRENT_USER\Software\Remcos-0AYDT9
- exepath = "{random characters}"
- In HKEY_CURRENT_USER\Software\Remcos-0AYDT9
- licence = "2634B4BC88ABED7A16B000348886CE5C"
Step 5
Search and delete these components
- %User Temp%\TowbarHamartia.dll
- %Application Data%\swfobject.js\special\sgen.exe
- %Application Data%\folder\x-vorbis+ogg.xml
- %Application Data%\folder\gutils.dll
- %Application Data%\discovery\software\18.opends60.dll
- %User Temp%\webmasters\dealer\metade.dll
- %User Temp%\Keystroke
- %User Temp%\2624bccb.lnk
- %User Temp%\webmasters\dealer\23.opends60.dll
- %Application Data%\discovery\software\normalization.dll
- %Application Data%\folder\rfc822.xml
- %Application Data%\folder\gtkwidgets.xml
- %User Temp%\webmasters\dealer\vjswebmigrationui.dll
- %Application Data%\folder\4.opends60.dll
- %Application Data%\folder\easthaven.xml
- %User Temp%\webmasters\dealer\VWDFormatOptions.xml
- %User Temp%\blogspot\VSLauncherUI.dll
- %User Temp%\cgi-exe\xdb\StatusNotifierWatcher.xml
- %Application Data%\folder\vcpropertymanagerui.dll
- %Application Data%\discovery\software\dpx.xml
- %User Temp%\webmasters\dealer\lc.exe
- %User Temp%\webmasters\dealer\isabel.xml
- %Application Data%\folder\x-dsl.xml
- %Application Data%\folder\model24.xml
- %Application Data%\system\logs.dat
- %User Temp%\Goldie.exe
- %Application Data%\discovery\software\model86.xml
- %Application Data%\discovery\software\62.opends60.dll
- %Application Data%\folder\pidgen.dll
- %Windows%\Tasks\netbtugc.job
- %Application Data%\folder\vnd.palm.xml
- %Application Data%\folder\vcencbld.dll
- %User Temp%\webmasters\dealer\vshost32.exe
- %Application Data%\folder\OfficeDevTechFilter20.xml
- %User Temp%\webmasters\dealer\jbimpui.dll
- %Application Data%\Macromedia\netbtugc.exe
- %Application Data%\folder\almsgs.dll
- %User Temp%\webmasters\dealer\org.gnome.evolution-data-server.calendar.gschema.xml
- %Application Data%\discovery\software\38.opends60.dll
- %Application Data%\discovery\software\dumpbin.exe
- %Application Data%\discovery\software\savedqueryheaders.xml
- %User Temp%\webmasters\dealer\rsnewfield.xml
Step 6
Search and delete these folders
- %User Temp%\cgi-exe
- %User Temp%\webmasters\dealer
- %Application Data%\swfobject.js\special
- %User Temp%\webmasters
- %Application Data%\folder
- %Application Data%\swfobject.js
- %User Profile%\AppData
- %Application Data%\discovery\software
- %User Temp%\cgi-exe\xdb
- %Application Data%\system
- %User Temp%\blogspot
- %System Root%\Users
- %Application Data%\discovery
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Backdoor.Win32.REMCOS.USMANEAGGC. 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 this Knowledge Base page for more information.
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