Analysis by: Roland Marco Dela Paz
 Modified by: jasperm
ALIASES:

Sophos: Troj/PDFJs-ON; Hbedv: EXP/Pidief.csi

 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

It takes advantage of software vulnerabilities to download files.

This Trojan may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

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

  TECHNICAL DETAILS

File Size: 33,477 bytes
File Type: PDF
Memory Resident: No
Initial Samples Received Date: 15 Dec 2010
Payload: Downloads files

Arrival Details

This Trojan may be dropped by other malware.

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:

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

  • http://{BLOCKED}rs.info/helpdesk/.img/4.php - detected as TSPY_ZBOT.XXR

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

Other Details

This Trojan does the following:

  • Checks the system date to get the month of the year. The exploit code only works when the month is November.

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.700.18
VSAPI PATTERN Date: 15 Dec 2010
VSAPI PATTERN Date: 12/15/2010 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

Remove malware files dropped/downloaded by TROJ_PIDIEF.XE

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_PIDIEF.XE. 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 this security patch 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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