TROJ_DLOADER.WCL
Trojan:Win32/Malagent (Microsoft); Trojan.Win32.Jorik.Llac.qiv (Kaspersky); LooksLike.Win32.Zbot.a (v) (Sunbelt)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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
198,144 bytes
EXE
No
09 Aug 2013
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:
- %Program Files%\Common Files\CreativeAudio.{2227A280-3AEA-1069-A2DE-08002B30309D}\upiucdlve.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
It creates the following folders:
- %Program Files%\Common Files\CreativeAudio.{2227A280-3AEA-1069-A2DE-08002B30309D}
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
Other System Modifications
This Trojan deletes the following files:
- %Program Files%\Common Files\CreativeAudio.{2227A280-3AEA-1069-A2DE-08002B30309D}\upiucdlve.exe:Zone.Identifier
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Win7zip
HKEY_CURRENT_USER\Software\Classes\
CLSID\{E668B397-51C7-E74E-8934-790CD824DE7D}\04200134\
CG1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
upiucdlve.exe
HKEY_LOCAL_MACHINE\Software\Win7zip
HKEY_CURRENT_USER\Software\Classes\
CLSID\{E668B397-51C7-E74E-8934-790CD824DE7D}\04200134\
CS1
HKEY_CURRENT_USER\Software\Classes\
CLSID\{E668B397-51C7-E74E-8934-790CD824DE7D}\04200134\
CW1
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Win7zip
Uuid = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Win7zip
Uuid = "{random values}"
It deletes the following registry keys:
HKEY_CURRENT_USER\CLSID\{E668B397-51C7-E74E-8934-790CD824DE7D}\
04200134\CW1
Dropping Routine
This Trojan drops the following files:
- %Program Files%\Common Files\CreativeAudio.{2227A280-3AEA-1069-A2DE-08002B30309D}\000109bf.txt
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
This report is generated via an automated analysis system.
SOLUTION
9.300
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
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_CURRENT_USER\Software
- Win7zip
- In HKEY_CURRENT_USER\Software\Classes\CLSID\{E668B397-51C7-E74E-8934-790CD824DE7D}\04200134
- CG1
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- upiucdlve.exe
- In HKEY_LOCAL_MACHINE\Software
- Win7zip
- In HKEY_CURRENT_USER\Software\Classes\CLSID\{E668B397-51C7-E74E-8934-790CD824DE7D}\04200134
- CS1
- In HKEY_CURRENT_USER\Software\Classes\CLSID\{E668B397-51C7-E74E-8934-790CD824DE7D}\04200134
- CW1
Step 3
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\Win7zip
- Uuid = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Win7zip
- Uuid = "{random values}"
Step 4
Search and delete this file
- %Program Files%\Common Files\CreativeAudio.{2227A280-3AEA-1069-A2DE-08002B30309D}\000109bf.txt
Step 5
Search and delete this folder
- %Program Files%\Common Files\CreativeAudio.{2227A280-3AEA-1069-A2DE-08002B30309D}
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADER.WCL. 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.
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.
- %Program Files%\Common Files\CreativeAudio.{2227A280-3AEA-1069-A2DE-08002B30309D}\upiucdlve.exe:Zone.Identifier
Step 8
Restore these deleted registry keys/values from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In HKEY_CURRENT_USER\CLSID\{E668B397-51C7-E74E-8934-790CD824DE7D}\04200134
- CW1
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