Analysis by: Christopher Daniel So
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  TECHNICAL DETAILS

File Size: 57,344 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 20 Oct 2010

Installation

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

  • %User Profile%\Application Data\Common Files\iexplore.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 drops the following files:

  • %User Profile%\Application Data\Common Files\msupx.dll - non-malicious file

(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.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_UDER\Software\Microsoft\
Windows\CurrentVersion\Run
IMJAPMIG8.1 = "%User Profile%\Application Data\Common Files\iexplore.exe"

It drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • iexplore.exe