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TROJ_PIDIEF.KFR
Malware type: Trojan
Destructive: No
Platform: Windows 2000, Windows XP, Windows Server 2003
In the wild: Yes

Overview


Infection Channel: Spammed via email

This Trojan arrives as an attachment to spammed email claiming to be from a security researcher. It drops a malicious JavaScript that drops a backdoor.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

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

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: 712,890 bytes
File type: PDF
Initial samples received date: 13 Apr 2012
Payload: Drops files

Arrival Details

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

Installation

This Trojan drops the following files:

It drops the following non-malicious file:

  • %User Temp%\Adobe.pdf

(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.)

Dropping Routine

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

  • Vulnerability in U3D component in Adobe Reader and Acrobat

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

Solution


Minimum scan engine: 9.200
First VSAPI Pattern File: 8.908.03
First VSAPI Pattern Release Date: 13 Apr 2012
VSAPI OPR Pattern Version: 8.909.00
VSAPI OPR Pattern Release Date: 13 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.KFR

Step 3

Search and delete this file

[ Learn more ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • %User Temp%\Adobe.pdf

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_PIDIEF.KFR. 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 these security patches 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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Analysis By: Cris Nowell Pantanilla

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