Analysis by: Karl Dominguez
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size: 5,408 bytes
File Type: PDF
Memory Resident: No
Initial Samples Received Date: 19 Aug 2010

Arrival Details

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

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

Download Routine

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

  • Doc.media.newPlayer Vulnerability – (CVE-2009-4324)
  • util.printf() – (CVE-2008-2992)
  • Collab.collectEmailInfo() – (CVE-2008-0655)
  • Collab.getIcon() – (CVE-2009-0927)

After successfully exploiting the said vulnerability, this malware connects to the following URLs to possibly download other malicious files:

  • http://justresins.com/tg/f5fa5d27babf7c7f5b46fb711e2745e5.php?showtopic={number}&showuser={number}&showforum=us&&reader_version={version}

It saves the files it downloads using the following names:

  • %User Temp%\e.exe

(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.)

Other Details

For more information on the aforementioned vulnerabilities, please see the following pages:

  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-4324
  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2992
  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0655
  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0927

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.396.01
VSAPI PATTERN Date: 19 Aug 2010
VSAPI PATTERN Date: 8/19/2010 12:00:00 AM

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

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