TROJ_VB.JCT
MonitoringTool:Win32/Yakoza.gen!A (Microsoft); Trojan.Gen (Symantec); Trojan.Win32.VB.fpj (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.835082 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
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
209,270 bytes
EXE
Yes
27 Nov 2012
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 creates the following folders:
- %Windows%\Crystal
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
Autostart Technique
This Trojan registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\stuad
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\htuad
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
RTR\TR
It adds the following registry entries:
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
RTR\TR
RT = "{random characters}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control
ServicesPipeTimeout = "271"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\stuad
Description = "{random characters}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\stuad
DisplayName = "Transaction Coordinator"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\stuad
ErrorControl = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\stuad
ImagePath = "%Windows%\Crystal\smss.exe /service"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\stuad
ObjectName = "LocalSystem"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\stuad
Start = "2"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\stuad
Type = "11"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\htuad
Description = "{random characters}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\htuad
DisplayName = "Transaction Coordinator"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\htuad
ErrorControl = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\htuad
ImagePath = "%Windows%\msapps\csrss.exe /service"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\htuad
ObjectName = "LocalSystem"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\htuad
Start = "2"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\htuad
Type = "11"
This report is generated via an automated analysis system.
SOLUTION
9.300
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restart in Safe Mode
Step 3
Delete this registry key
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\CurrentControlSet\Services
- stuad
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- htuad
- In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\RTR
- TR
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\VB and VBA Program Settings\RTR\TR
- RT = "{random characters}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control
- ServicesPipeTimeout = "271"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\stuad
- Description = "{random characters}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\stuad
- DisplayName = "Transaction Coordinator"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\stuad
- ErrorControl = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\stuad
- ImagePath = "%Windows%\Crystal\smss.exe /service"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\stuad
- ObjectName = "LocalSystem"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\stuad
- Start = "2"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\stuad
- Type = "11"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\htuad
- Description = "{random characters}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\htuad
- DisplayName = "Transaction Coordinator"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\htuad
- ErrorControl = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\htuad
- ImagePath = "%Windows%\msapps\csrss.exe /service"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\htuad
- ObjectName = "LocalSystem"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\htuad
- Start = "2"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\htuad
- Type = "11"
Step 5
Search and delete this folder
- %Windows%\Crystal
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_VB.JCT. 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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