Trojan.Win32.ZBOT.E
Worm:Win32/Ainslot.A (Microsoft); Trojan.Win32.VBKrypt.hlkh (Kaspersky); Mal/VBCheMan-C, Mal/VBCheMan-C, Mal/VBCheMan-C, Mal/VBCheMan-C (Sophos)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan 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
Arrival Details
This Trojan 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 Trojan adds the following processes:
- "%Application Data%\test\testsonar.exe"
- %Application Data%\test\testsonar.exe
- %System%\reg.exe REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /v "testz.exe" /t REG_SZ /d "%Application Data%\test\testsonar.exe" /f
- %Application Data%\test\testsonar.exe
- cmd /c REG ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile /v "DoNotAllowExceptions" /t REG_DWORD /d "0" /f
- cmd /c REG ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List /v "%Application Data%\test\testsonar.exe" /t REG_SZ /d "%Application Data%\test\testsonar.exe:*:Enabled:Windows Messanger" /f
- cmd /c REG ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List /v "%User Temp%\iexplore.exe" /t REG_SZ /d "%User Temp%\iexplore.exe:*:Enabled:Windows Messanger" /f
- %System%\reg.exe REG ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile /v "DoNotAllowExceptions" /t REG_DWORD /d "0" /f
- %System%\reg.exe REG ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List /v "%Application Data%\test\testsonar.exe" /t REG_SZ /d "%Application Data%\test\testsonar.exe:*:Enabled:Windows Messanger" /f
- %System%\reg.exe REG ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List /v "%User Temp%\iexplore.exe" /t REG_SZ /d "%User Temp%\iexplore.exe:*:Enabled:Windows Messanger" /f
(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).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %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 creates the following folders:
- %Application Data%\test
(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).)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
testz.exe = "%Application Data%\test\testsonar.exe"
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
SrvID\ID
UA2LQ0GGVV = "DE287"
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
INSTALL\DATE
UA2LQ0GGVV = "October 14, 2019"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DoNotAllowExceptions = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List\%Application Data%\test
testsonar.exe = "%Application Data%\test\testsonar.exe:*:Enabled:Windows Messanger"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List\%User Temp%
iexplore.exe = "%User Temp%\iexplore.exe:*:Enabled:Windows Messanger"
Dropping Routine
This Trojan drops the following files:
- %User Temp%\data.dat
- %User Temp%\iexplore.exe
- %Application Data%\test\testsonar.exe
(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).)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://liqtoboy.{BLOCKED}p.biz
This report is generated via an automated analysis system.
SOLUTION
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 Trojan.Win32.ZBOT.E
- 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\Microsoft\Windows\CurrentVersion\Run
- testz.exe = "%Application Data%\test\testsonar.exe"
- In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\SrvID\ID
- UA2LQ0GGVV = "DE287"
- In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\INSTALL\DATE
- UA2LQ0GGVV = "October 14, 2019"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DoNotAllowExceptions = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\%Application Data%\test
- testsonar.exe = "%Application Data%\test\testsonar.exe:*:Enabled:Windows Messanger"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\%User Temp%
- iexplore.exe = "%User Temp%\iexplore.exe:*:Enabled:Windows Messanger"
Step 5
Search and delete these components
- %User Temp%\data.dat
- %User Temp%\iexplore.exe
- %Application Data%\test\testsonar.exe
Step 6
Search and delete this folder
- %Application Data%\test
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.Win32.ZBOT.E. 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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