WORM_CMDLOH.AA

 Analysis by: Roland Marco Dela Paz

 ALIASES:

P2P-Worm.Win32.CMDloh.b (Kaspersky); Worm:Win32/Autorun.ABS (Microsoft)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm arrives via peer-to-peer (P2P) shares. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

102,400 bytes

File Type:

EXE

Initial Samples Received Date:

14 Feb 2012

Arrival Details

This worm arrives via peer-to-peer (P2P) shares.

It 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:

  • %System%\wcynsvc.exe

(Note: %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.)

Autostart Technique

This worm registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wnetwisk
ImagePath = "%System%\wcynsvc.exe"

Other Details

This worm connects to the following website to send and receive information:

  • {BLOCKED}ng55.{BLOCKED}2.org
  • {BLOCKED}ng33.{BLOCKED}p.net