Analysis by: adel
 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

Trend Micro has flagged this Trojan as noteworthy due to the increased potential for damage, propagation, or both, that it possesses.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This exploit may be downloaded unknowingly by a user when visiting malicious Web sites. It then executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system. It takes advantage of the Adobe Reader and Acrobat 'newplayer()' JavaScript Method Remote Code Execution Vulnerability, which is a Use-after-free vulnerability in Doc.media.newPlayer method in Adobe Reader and Acrobat 8.0 to 9.2, and possibly earlier versions.

It then drops files detected as TROJ_DLOAD.COB and TROJ_SMALL.MLC.

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

  TECHNICAL DETAILS

File Size: 70,437 bytes
File Type: PDF
Memory Resident: No
Initial Samples Received Date: 14 Jan 2010
Payload: Drops files

Arrival Details

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

Dropping Routine

This Trojan drops the following files:

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

  • Adobe Reader and Acrobat 'newplayer()' JavaScript Method Remote Code Execution Vulnerability

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 6.770.01
FIRST VSAPI PATTERN DATE: 15 Jan 2010
VSAPI OPR PATTERN File: 6.771.00
VSAPI OPR PATTERN Date: 16 Jan 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_PIDIEF.SHK

    • TROJ_DLOAD.COB
    • TROJ_SMALL.MLC

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_PIDIEF.SHK. 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.

Step 4

This step disables JavaScript rendering in Adobe Acrobat/Reader.

  1. In your Adobe Acrobat/Reader window, Click Edit then choose Preferences.
  2. In the left panel, click JavaScript.
  3. In the right panel, uncheck the Enable Acrobat JavaScript option.
  4. Click OK.


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