Analysis by: Michael Cabel
 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 specially crafted PDF takes advantage of a vulnerability in U3D implementation in certain versions of Adobe Reader and Acrobat.

After successfully exploiting the said vulnerability, it drops an embedded EXE file detected by Trend Micro as BKDR_TROGBOT.A.

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: 407,788 bytes
File Type: PDF
Memory Resident: No
Initial Samples Received Date: 01 Jul 2011
Payload: Drops files

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Dropping Routine

This Trojan executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

Other Details

More information on this vulnerability can be found below:

  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3959
  • http://www.adobe.com/support/security/bulletins/apsb10-02.html

NOTES:
This specially crafted PDF takes advantage of a vulnerability in U3D implementation in certain versions of Adobe Reader and Acrobat. After successfully exploiting the said vulnerability, it drops an embedded EXE file detected by Trend Micro as BKDR_TROGBOT.A.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.260.09
FIRST VSAPI PATTERN DATE: 01 Jul 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

Remove malware files dropped/downloaded by TROJ_PIDIEF.CRW

    BKDR_TROGBOT.A

Step 3

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

Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors. http://www.adobe.com/support/security/bulletins/apsb10-02.html


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