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TROJ_PDFJSC.MX

October 08, 2012
 Analysis by: Karl Dominguez
 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

  OVERVIEW


This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size:

69,120 bytes

File Type:

PDF

Memory Resident:

No

Initial Samples Received Date:

24 Aug 2010

Payload:

Drops files

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This Trojan drops and executes the following files:

  • %User Temp%\alg.exe - TROJ_DROPPR.SA

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

Dropping Routine

This Trojan takes advantage of the following software vulnerabilities to drop malicious files:

  • Doc.media.newPlayer Vulnerability (CVE-2009-4324)

Other Details

More information on this vulnerability can be found below:

  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-4324

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.406.04

VSAPI OPR PATTERN Date:

24 Aug 2010

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

Remove malware files dropped/downloaded by TROJ_PDFJSC.MX

    TROJ_DROPPR.SA

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_PDFJSC.MX. 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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