BKDR_WOLYX.TYT

This malware checks if it is injected to certain processes.

It checks if it is injected to certain Web browsers.

It is capabable of executing certain commands.

This backdoor may be dropped by other malware.

It deletes itself after execution.

Arrival Details

This backdoor may be dropped by the following malware:

• TROJ_MDROP.TYT
• TROJ_HUPIGO.RUD

Installation

This backdoor drops a copy of itself in the following folders using different file names:

• %User Temp\{Random filename and extension}

It drops the following component file(s):

• %Program Files%\Common Files\Microsoft Shared\OFFICE12\MSO32.DLL - detected as BKDR_WOLYX.TYT

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

It creates the following folders:

• %System Root%\Users\Public\{AFAFB2EE-837C-4EA5-B933-998F94AEC654}
• %System Root%\ProgramData\{AFAFB2EE-837C-4EA5-B933-998F94AEC654}
• %Windows%\TEMP\TEMP
• %Program Files%\Common Files\Microsoft Shared\OFFICE12

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

Other System Modifications

This backdoor adds the following registry entries as part of its installation routine:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Session Manager
PendingFileRenameOperations = %User Temp\{Random filename and extension}

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WinSock2\mswsock32
1001 = %SystemRoot%\system32\mswsock.dll

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WinSock2\mswsock32
1002 = %SystemRoot%\system32\mswsock.dll

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WinSock2\mswsock32
1003 = %SystemRoot%\system32\mswsock.dll

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WinSock2\mswsock32
1004 = %SystemRoot%\system32\rsvpsp.dll

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WinSock2\mswsock32
1005 = %SystemRoot%\system32\rsvpsp.dll

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WinSock2\mswsock32
PathName = %Program Files%\Common Files\Microsoft Shared\OFFICE12\MSO32.DLL

Other Details

This backdoor connects to the following possibly malicious URL:

• {BLOCKED}.{BLOCKED}.172.177

It deletes itself after execution.

NOTES:

It checks if it is injected to the following processes:

• 360sd.exe
• 360rp.exe
• 360safe.exe
• 360tray.exe
• avp.exe
• dsmain.exe
• dumprep.exe

It checks if it is injected to the following Web browsers:

• firefox.exe
• maxthon.exe
• ttraveler.exe
• theworld.exe

It is capabable of the following commands:

• Command Shell
• Create/Delete Directories
• Create/Read/Delete Files
• Get System Info
• Create/Terminate Process
• Key Logging
• Take ScreenShot