Analysis by: Sabrina Lei Sioting
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan modifies Internet Explorer security settings. This puts the affected computer at greater risk, as it allows malicious URLs to be accessed by the computer.

It attempts to access certain websites. However, the websites are inaccessible as of this writing. It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size: 360,328 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 26 Jan 2012

Installation

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

  • %System Root%\Documents and Settings\All Users\Application Data\{random}.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It drops the following files:

  • %System Root%\Documents and Settings\All Users\Application Data\{random}
  • %Application Data%\Microsoft\Internet Explorer\Quick Launch\System Check.lnk
  • %User Profile%\Desktop\System Check.lnk
  • %User Profile%\Start Menu\Programs\System Check\System Check.lnk
  • %User Profile%\Start Menu\Programs\System Check\Uninstall System Check.lnk

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %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 creates the following folders:

  • %User Profile%\Start Menu\Programs\System Check

(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.)

Web Browser Home Page and Search Page Modification

This Trojan modifies Internet Explorer zone settings.

Other Details

This Trojan attempts to access certain websites. However, the websites are inaccessible as of this writing.

It connects to the following possibly malicious URL:

  • http://{BLOCKED}.com
  • http://{BLOCKED}.com
  • http://{BLOCKED}.com
  • http://{BLOCKED}.com
  • http://{BLOCKED}.com
  • http://{BLOCKED}.com

It deletes the initially executed copy of itself