TROJ_BANKER.WUVL
Trojan-Banker.Win32.Agent.kjf (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse PSW.Banker6.BMBH (AVG)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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.
It disables Task Manager, Registry Editor, and Folder Options.
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 drops the following copies of itself into the affected system:
- %User Profile%\CWS04_11-WILBERT\cws04_11dllhost.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
It creates the following folders:
- %User Profile%\Windows\Explorer
- %User Profile%\Explorer\CWS04_11-WILBERT
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
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
CWS04_11SysSSLV7R1 = "%User Profile%\CWS04_11-WILBERT\cws04_11SysSSLV7R1.bat"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
CWS04_11SysSSLV7R1 = "%User Profile%\CWS04_11-WILBERT\cws04_11SysSSLV7R1.bat"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer
NoTrayContextMenu = "1"
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoTrayContextMenu = "1"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\CWS04_11-WILBERT\cws04_11SysSSLV7R123.06.14 .zip
- %User Profile%\CWS04_11-WILBERT\Cliente2.pkg
- %User Profile%\CWS04_11-WILBERT\cws04_11SysSSLV7R1.bat
- %Common Startup%\cws04_11SysSSLV7R1.bat
- %User Profile%\CWS04_11-WILBERT\CWS04_112.zip
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Common Startup% is the system's shared Startup folder, which is usually C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003.)
Other Details
This Trojan connects to the following possibly malicious URL:
- {BLOCKED}4.121.63
- {BLOCKED}101.247
- {BLOCKED}.171.82
- {BLOCKED}101.90
This report is generated via an automated analysis system.
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
Enable Registry Editor, Task Manager, and Folder options
Step 4
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\Software\Microsoft\Windows\CurrentVersion\Policies
- Explorer
Step 5
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
- CWS04_11SysSSLV7R1 = "%User Profile%\CWS04_11-WILBERT\cws04_11SysSSLV7R1.bat"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- CWS04_11SysSSLV7R1 = "%User Profile%\CWS04_11-WILBERT\cws04_11SysSSLV7R1.bat"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
- NoTrayContextMenu = "1"
Step 6
Search and delete these components
- %User Profile%\CWS04_11-WILBERT\cws04_11SysSSLV7R123.06.14 .zip
- %User Profile%\CWS04_11-WILBERT\Cliente2.pkg
- %User Profile%\CWS04_11-WILBERT\cws04_11SysSSLV7R1.bat
- %Common Startup%\cws04_11SysSSLV7R1.bat
- %User Profile%\CWS04_11-WILBERT\CWS04_112.zip
Step 7
Search and delete these folders
- %User Profile%\Windows\Explorer
- %User Profile%\Explorer\CWS04_11-WILBERT
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BANKER.WUVL. 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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