Analysis by: Abraham Latimer Camba
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This file infector 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 URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.

  TECHNICAL DETAILS

File Size: Varies
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 19 May 2009

Arrival Details

This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other System Modifications

This file infector adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
\??\C:\WINDOWS\system32\winlogon.exe = "\??\C:\WINDOWS\system32\winlogon.exe:*:enabled:@shell32.dll,-1"

Backdoor Routine

This file infector connects to any of the following IRC server(s):

  • {BLOCKED}c.{BLOCKED}ef.pl

Download Routine

This file infector connects to the following malicious URLs:

  • http://{BLOCKED}1.{BLOCKED}7.82.138/rus.php
  • http://{BLOCKED}kl23.com/fth.txt
  • http://{BLOCKED}1.{BLOCKED}4.242.31/temp/1.exe