BKDR_ZZSLASH_0000004.TOMA

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.

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%\1.tmp
• %Windows%\vqgw
• %System%\GroupPolicy\user\Scripts\Startup
• %System%\GroupPolicy
• %System%\GroupPolicy\user
• %System%\GroupPolicy\user\Scripts
• %System%\GroupPolicy\user\Scripts\Shutdown

(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.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Other System Modifications

This backdoor deletes the following files:

• %User Temp%\1.tmp
• %User Temp%\1.tmp\script.ini
• %System Root%\alg.exe
• %Temp%\scs2.tmp
• %Temp%\scs3.tmp

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

Dropping Routine

This backdoor drops the following files:

• won.dat
• woti.dat
• wg.exe
• %Program Files%\error.gg
• %System%\GroupPolicy\gpt.ini
• script.ini
• /alg.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Other Details

This backdoor connects to the following possibly malicious URL:

• http://www.{BLOCKED}u.ah163.net/jxc/Skin/logo.jpg
• http://www.{BLOCKED}7.info/bt/alg.exe
• http://www.{BLOCKED}u.ah163.net/jxc/Count/images/tj/count.asp?{random characters}

This report is generated via an automated analysis system.