WORM_AUTORUN.PB

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

• %Program Files%\Microsoft Common\svchost.exe

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

It creates the following folders:

• %Program Files%\Microsoft Common

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

Other System Modifications

This worm adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
explorer.exe

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
explorer.exe
Debugger = "%Program Files%\Microsoft Common\svchost.exe"

Dropping Routine

This worm drops the following files:

• %User Temp%\rdl1.tmp
• %User Temp%\rdl2.tmp
• %System%\DRIVERS\asyncmac.sys
• A:\system.exe

(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% 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 worm connects to the following possibly malicious URL:

• http://{BLOCKED}xt.cn/ld.php?{random characters}
• http://{BLOCKED}iw123.com/ld.php?v=1&rs=1756172240&n=1&uid=1

This report is generated via an automated analysis system.