Analysis by: Jasen Sumalapao
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

It uses icons similar to those of legitimate applications to entice a user to click them.

This file contains a URL where it connects to possibly download other files. It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 49,152 bytes
File Type: EXE
Initial Samples Received Date: 24 Jun 2012

Arrival Details

This Trojan 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 Trojan drops a copy of itself in the following folders using different file names:

  • %User Profile%\{User Name}\Local Settings\Application Data\(Random Filename).exe

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

It injects itself into the following processes running in the affected system's memory:

  • svchost.exe

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random characters} = %User Profile%\{User Name}\Local Settings\Application Data\{random filename}.exe

Propagation

This Trojan uses icons similar to those of legitimate applications to entice a user to click them.

Other Details

This file contains a URL where it connects to possibly download other files. As of this writing, this file contains the following URLs:

  • http://bing.com/{BLOCKED}u/index.php?r=gate&gh=
  • http://twitter.com/{BLOCKED}l/index.php?r=gate&ac=
  • http://{BLOCKED}lands2012.ru/forum/index.php?r=gate&id=
  • http://google.com/{BLOCKED}h/index.php?r=gate&cc=
  • http://fb.com/{BLOCKED}h/index.php?r=gate&fg=
  • http://{BLOCKED}-of10.ru/forum index.php?r=gate&id=
  • http://{BLOCKED}aof.ru/forum/index.php?r=gate&id=
  • http://{BLOCKED}obin20.ru/forum/index.php?r=gate&id=

It deletes itself after execution.