Analysis by: Mark Joseph Manahan
ALIASES:

Exploit:Win32/Pdfjsc.AGC (Microsoft), JS/Exploit.Pdfka.QCG trojan (Eset)

 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: Spammed via email

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

  TECHNICAL DETAILS

File Size: 11,143 bytes
File Type: PDF
Memory Resident: No
Initial Samples Received Date: 25 Jan 2013
Payload: Downloads files

Arrival Details

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

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}nal.net/detects/seen-taste.php?gggy=2v:1j:1g:1n:1f&jpns=1h:30:1n:1f:1f:2v:1g:1m:2w:1h&hxdrnkic=1i&wsnzmrpg=rwtphtj&jivr=douelpr

It saves the files it downloads using the following names:

  • %User Temp%\wpbt0.dll - detected as TSPY_ZBOT.MOL

(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN DATE: 05 Nov 2012
VSAPI OPR PATTERN Date: 06 Nov 2012

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

Remove the malware/grayware file dropped/downloaded by TROJ_PIDIEF.HAM

Step 3

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