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:
- %User Profile%\Application Data\cQ1Vb72t6
- %User Profile%\Application Data\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B
- %User Profile%\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B\Logs
- %User Profile%\Logs\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.)
Other System Modifications
This Trojan deletes the following files:
- {malware path and file name}:zone.identifier
- %Windows%\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe:Zone.Identifier
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
Dropping Routine
This Trojan drops the following files:
- %User Profile%\cQ1Vb72t6\6294.xml
- %User Startup%\gNNL94gD.lnk
- %User Profile%\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B\run.dat
(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.. %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
This report is generated via an automated analysis system.
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
Search and delete these components
[ Learn More ]
[ back ]
There may be some components that are hidden. Please make sure you check the
Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
- %User Profile%\cQ1Vb72t6\6294.xml
- %User Startup%\gNNL94gD.lnk
- %User Profile%\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B\run.dat
To manually delete a malware/grayware file from an affected system:
• For Windows 2000, Windows XP, and Windows Server 2003:
- Right-click Start then click Search....
- In the File name* input box, type the following:
- %User Profile%\cQ1Vb72t6\6294.xml
- %User Startup%\gNNL94gD.lnk
- %User Profile%\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B\run.dat
- In the Look In drop-down list, select My Computer then press Enter.
- Once located, select the file then press SHIFT+DELETE to delete it.
*Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).
• For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:
- Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen,then click File Explorer.
- In the Search Computer/This PC input box, type:
- %User Profile%\cQ1Vb72t6\6294.xml
- %User Startup%\gNNL94gD.lnk
- %User Profile%\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B\run.dat
- Once located, select the file then press SHIFT+DELETE to delete it.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 3
Search and delete these folders
[ Learn More ]
[ back ]
Please make sure you check the
Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
- %User Profile%\Application Data\cQ1Vb72t6
- %User Profile%\Application Data\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B
- %User Profile%\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B\Logs
- %User Profile%\Logs\Wilbert
To delete malware/grayware/spyware folders:
For Windows 2000, Windows XP, and Windows Server 2003:
- Right-click Start then click Search... or Find..., depending on the version of Windows you are running.
- In the File name* input box, type:
- %User Profile%\Application Data\cQ1Vb72t6
- %User Profile%\Application Data\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B
- %User Profile%\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B\Logs
- %User Profile%\Logs\Wilbert
- In the Look In drop-down list, select My Computer, then press Enter.
- Once located, select the folder then press SHIFT+DELETE to permanently delete the folder.
- Repeat steps 2 to 4 for the remaining folders:
- %User Profile%\Application Data\cQ1Vb72t6
- %User Profile%\Application Data\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B
- %User Profile%\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B\Logs
- %User Profile%\Logs\Wilbert
*Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).
For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:
- Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen, then click File Explorer.
- In the Search Computer/This PC input box, type:
- %User Profile%\Application Data\cQ1Vb72t6
- %User Profile%\Application Data\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B
- %User Profile%\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B\Logs
- %User Profile%\Logs\Wilbert
- Once located, select the file then press SHIFT+DELETE to permanently delete the folder.
- Repeat steps 2-3 for the remaining folders:
- %User Profile%\Application Data\cQ1Vb72t6
- %User Profile%\Application Data\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B
- %User Profile%\6ABCE574-4AFC-42C5-8AB9-5739A84D8A8B\Logs
- %User Profile%\Logs\Wilbert
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_STIMILIK.YD. 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 5
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.
- {malware path and file name}:zone.identifier
- %Windows%\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe:Zone.Identifier
