Analysis by: Rhena Inocencio
ALIASES:

Exploit:Win32/Pdfjsc.AGC (Microsoft), PDF/Blacole-FEI!2A2B20A28D80 (McAfee), JS/Exploit.Pdfka.QDL trojan (ESET), Troj/PDFEx-GX (Sophos)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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.

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 10,949 bytes
File Type: PDF
Initial Samples Received Date: 28 Feb 2013
Payload: Connects to URLs/IPs, Downloads 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.

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}selse.org/closest/98y7y432ufh49gj23sldkkqowpsskfnv.php?xmdud=1g:1l:1k:1m:33&dtapadfw=1n:32:1i:2w:1m:1g:33:31:1h:31&xvyo=1i&wjdxc=knixir&bnnfwxs=xrgluipy

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

As of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.758.02
FIRST VSAPI PATTERN DATE: 28 Feb 2013
VSAPI OPR PATTERN File: 9.759.00
VSAPI OPR PATTERN Date: 01 Mar 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product to delete files detected as TROJ_PIDIEF.MEX. 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 3

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.


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