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TROJ_MOTMOT.DRP

October 09, 2012
 Analysis by: Roland Marco Dela Paz
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

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:

176,904 bytes

File Type:

RAR

Memory Resident:

No

Initial Samples Received Date:

10 Aug 2011

Payload:

Creates files, Drops files

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following files:

  • %Application Data%\Sun\Java\jre1.6.3\tintsetp.exe - detected as TROJ_MOTMOT.CI
  • %Application Data%\Sun\Java\jre1.6.3\winmsgr.exe - detected as TROJ_MOTMOT.W

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

It drops the following non-malicious files:

  • %Application Data%\Sun\Java\jre1.6.3\proto.dat - encrypted configuration file for TROJ_MOTMOT.CI
  • %Application Data%\Sun\Java\jre1.6.3\time.dat - encrypted configuration file for TROJ_MOTMOT.CI

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

It creates the following folders:

  • %Application Data%\Sun
  • %Application Data%\Sun\Java
  • %Application Data%\Sun\Java\jre1.6.3

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data 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:

8.900

FIRST VSAPI PATTERN FILE:

8.346.04

FIRST VSAPI PATTERN DATE:

10 Aug 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_MOTMOT.DRP

Step 3

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Application Data%\Sun

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_MOTMOT.DRP. 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:

RECOMMENDATIONS

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:

To enable Firewall to protect against threats: How to enable or disable the Personal Firewall of Trend Micro EN 1038273

  • 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 untrusted websites.
  • 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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