BKDR_WOODINI.A

Upon execution, this backdoor terminates certain processes.

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_ARTIEF.MR
• TROJ_ARTIEF.EO
• TROJ_EXLDROP.SM

Installation

This backdoor drops the following copies of itself into the affected system:

• %Application Data%\ws2help.PNF
• %Application Data%\IECheck.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

It drops the following files:

• %Application Data%\msvcr.dll
• %system%\{random numbers}

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• VistaDLLPro RUNNING

Autostart Technique

This backdoor drops the following shortcut pointing to its copy in the User Startup folder to enable its automatic execution at every system startup:

• %Start Menu%\Programs\Startup\Internet Explorer Security Check.lnk

(Note: %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.)

Other Details

This backdoor deletes itself after execution.

NOTES:

It queries the value in the following registry to check installed applications:

SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall

If "DisplayName" matches any of the following strings, it does not continue with its routines:

• Kaspersky
• 360
• Trend
• COMODO
• AVG
• BitDefender
• Avira Premium Security Suite
• ESET
• Avira
• Norton Internet Security

It also terminates processes related to Kaspersky antivirus:

• KSafeSvc.exe
• KSafeTray.exe