Analysis by: Erika Bianca Mendoza
 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 connects to a server to wait for commands coming from a remote user. If the connection is successful, it may download/upload files or perform shell commands.

This Trojan may arrive bundled with malware packages as a malware component.

  TECHNICAL DETAILS

File Size: 32,768 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 19 Dec 2011

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

Installation

This Trojan adds the following mutexes to ensure that only one of its copies runs at any one time:

  • mark02

NOTES:

It connects to the following server to wait for commands coming from a remote user:

  • war.{BLOCKED}uo.com

If the connection is successful, it may download/upload files or perform shell commands.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.654.04
FIRST VSAPI PATTERN DATE: 19 Dec 2011

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Identify and terminate files detected as TROJ_PAKES.LEX

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_PAKES.LEX. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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