Arrival Details
This backdoor 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 backdoor creates the following folders:
- %User Temp%\par-57696c62657274
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d
(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Dropping Routine
This backdoor drops the following files:
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/{malware file name}
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/perl518.dll
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/libgcc_s_sjlj-1.dll
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/libstdc++-6.dll
(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
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 Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/{malware file name}
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/perl518.dll
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/libgcc_s_sjlj-1.dll
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/libstdc++-6.dll
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 Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/{malware file name}
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/perl518.dll
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/libgcc_s_sjlj-1.dll
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/libstdc++-6.dll
- 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 2003 (R2), Windows 8, Windows 8.1, and Windows Server 2012 (R2):
- Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 (R2) users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 (R2) 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 Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/{malware file name}
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/perl518.dll
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/libgcc_s_sjlj-1.dll
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d/libstdc++-6.dll
- 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 Temp%\par-57696c62657274
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d
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 Temp%\par-57696c62657274
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d
- 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 Temp%\par-57696c62657274
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d
*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 2003 (R2), Windows 8, Windows 8.1, and Windows Server 2012 (R2):
- Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 (R2) users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 (R2) 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 Temp%\par-57696c62657274
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d
- Once located, select the file then press SHIFT+DELETE to permanently delete the folder.
- Repeat steps 2-3 for the remaining folders:
- %User Temp%\par-57696c62657274
- %User Temp%\par-57696c62657274\cache-f348e3737b330e1c624f50510a156abac8b11f5d
*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 BKDR_IRCBOT.WPHH. 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.
