Analysis by: Christopher Daniel So
 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

However, as of this writing, the said sites are inaccessible.

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

  TECHNICAL DETAILS

File Size: Varies
File Type: PDF
Memory Resident: No
Initial Samples Received Date: 24 Sep 2010
Payload: Downloads files

Arrival Details

However, as of this writing, the said sites are inaccessible.

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}ro.com.ar/images/image.php?id=10&

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

  • Adobe Acrobat and Reader Collab 'getIcon()' JavaScript Method Remote Code Execution Vulnerability (CVE-2009-0927)
  • Adobe Reader CollectEmailInfo Vulnerability (CVE-2007-5659)

It saves the files it downloads using the following names:

  • %System%\~.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows 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: 8.900
VSAPI OPR PATTERN File: 7.489.00
VSAPI OPR PATTERN Date: 25 Sep 2010

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

Search and delete these files

[ 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.
  • %System%\~.exe

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_PIDIEF.SMJZ. 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 4

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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