Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may arrive bundled with malware packages as a malware component. It may be downloaded by other malware/grayware/spyware from remote sites.

It is a specially crafted PDF file which when viewed or executed, may allow a malicious user to take control over an affected system.

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: 151,236 bytes
File Type: PDF
Memory Resident: No
Initial Samples Received Date: 01 Mar 2011
Payload: Drops files

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

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

Backdoor Routine

This Trojan is a specially crafted PDF file which when viewed or executed, may allow a malicious user to take control over an affected system.

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\alg.exe - detected as BKDR_TIDSERV.DM

(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.)

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

NOTES:
It also drops the following normal PDF file and opens it to trick users into thinking that the initially opened PDF file is not malicious:

  • %User Temp%\{Non-english Characters}.pdf

  SOLUTION

Minimum Scan Engine: 8.900

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.SMCM

    BKDR_TIDSERV.DM

Step 3

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