Analysis 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 may be dropped by other malware.

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: 207488 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 10 Aug 2011

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_MOTMOT.CI

Installation

This Trojan drops and executes the following files:

  • %User Temp%\winmsgr.exe - detected as TROJ_MOTMOT.W
  • %User Temp%\automngr.exe - detected as WORM_OTORUN.MOT

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

NOTES:

This malware is a .RAR SFX archive that is configured to exhibit the above-mentioned installation.

  SOLUTION

Minimum Scan Engine: 9.200

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_SFXMOT.A

Step 3

Remove the malware/grayware file that dropped/downloaded TROJ_SFXMOT.A

     TROJ_MOTMOT.CI

Step 4

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%\winmsgr.exe
  • %User Temp%\automngr.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_SFXMOT.A. 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.

NOTES:

Recommendation

This malware is detected and removed by the latest Trend Micro anti-malware engine and pattern. Always keep pattern files and engines up-to-date. To know more about updating your Trend Micro product’s pattern, please refer to the following Trend Micro support page:


Note: The steps apply for specific products indicated in the page.

To actively detect and protect your machine, enable real-time scanning of your Trend Micro anti-malware product. Refer to the following Trend Micro support page to know more about enabling real-time scanning in your Trend Micro product:

Enable firewall to protect against threats.


Be aware of social engineering attacks.
Avoid accessing the listed malicious URLs to prevent possible re-infection.
Monitor network connections for any suspicious connection or connectivity.
Regularly update list of sites that are trusted.
Avoid downloading software cracks and/or pirated applications.
Clear browser cache and delete cookies regularly.
Delete files in the %User Temp% folder.


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