Analysis by: Roland Marco Dela Paz
ALIASES:

Exploit:Win32/Pdfjsc.RM (Microsoft); Troj/PDFJS-WD (Sophos)

 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

Infection Channel: Downloaded from the Internet

This Trojan may be unknowingly downloaded by a user while visiting malicious websites. It may be hosted on a website and run when a user accesses the said website.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: 14,806 bytes
File Type: PDF
Memory Resident: No
Initial Samples Received Date: 25 Apr 2012
Payload: Downloads files

Arrival Details

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

It may be hosted on a website and run when a user accesses the said website.

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}c.org.au/friends/newsletter/news.exe - detected as TSPY_BEBLOH.AQ
  • http://{BLOCKED}w.net.au/_overlay/services.exe - detected as TSPY_BEBLOH.AQ

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

  • Adobe TIFF File Vulnerability

It saves the files it downloads using the following names:

  • %User Temp%\wpbt0.dll
  • %User Temp%\wpbt1.dll

(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.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.938.04
FIRST VSAPI PATTERN DATE: 25 Apr 2012
VSAPI OPR PATTERN File: 8.939.00
VSAPI OPR PATTERN Date: 25 Apr 2012

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/grayware files dropped/downloaded by TROJ_PIDIEF.EKG

    • TSPY_BEBLOH.AQ

Step 3

Close all opened browser windows

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_PIDIEF.EKG. 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 5

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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