Analysis by: Sabrina Lei Sioting
 Modified by: Erika Bianca Mendoza
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan takes advantage of a known vulnerability in Adobe Reader and Acrobat version 9.x before 9.4 and 8.x before 8.2.5.

It executes the files it drops, prompting the affected system to exhibit the malicious routines they contain.

This Trojan arrives as attachment to mass-mailed email messages. It may be downloaded by other malware/grayware/spyware from remote sites.

  TECHNICAL DETAILS

File Size: 654,375 bytes
File Type: PDF
Memory Resident: No
Initial Samples Received Date: 29 Mar 2011
Payload: Drops files

Arrival Details

This Trojan arrives as attachment to mass-mailed email messages.

It may be downloaded by other malware/grayware/spyware from remote sites.

Installation

This Trojan drops the following files:

  • %current%\iso88591 - non-executable file that contains shellcode
  • %UserTemp%\Adobe-.pdf - non malicious PDF file

NOTES:

Other Details

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

  • CVE-2010-2883

It drops the following files:

  • %Program Files%\Common Files\Microsoft Shared\update.exe - detected by Trend Micro as TROJ_DROPPR.FA

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

It executes the files it drops, prompting the affected system to exhibit the malicious routines they contain.

This Trojan takes advantage of a known vulnerability in Adobe Reader and Acrobat version 9.x before 9.4 and 8.x before 8.2.5.

More information on this vulnerability can be found below:

  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2883

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 7.938.03
FIRST VSAPI PATTERN DATE: 29 Mar 2011
VSAPI OPR PATTERN File: 7.939.00
VSAPI OPR PATTERN Date: 29 Mar 2011

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 files dropped/downloaded by TROJ_PIDIEF.OB

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.
%current%\iso88591
%UserTemp%\Adobe-.pdf

Step 4

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

NOTES:

http://www.adobe.com/support/security/advisories/apsa10-02.html


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