Analysis by: Roland Marco Dela Paz
ALIASES:

Trojan Horse (Symantec)

 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 may be bundled with certain components.

This Trojan may be dropped by other malware.

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

  TECHNICAL DETAILS

File Size: 1,051,528 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 10 Aug 2011
Payload: Downloads files

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_MOTMOT.W

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
{malware file name} = "{malware path and file name}"

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}2.{BLOCKED}7.167.21/major/images/view.php
  • http://{BLOCKED}2.{BLOCKED}7.167.21/major/txt/read.php

It saves the files it downloads using the following names:

  • %Current%\ctfmon.exe - detected as TROJ_GARVEEP.C

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

NOTES:

It may be bundled with the following components:

  • %Temp%\CR_1.tmp\dtlcntr.exe
  • %Temp%\CR_1.tmp\googletoolbar.exe
  • %Temp%\CR_1.tmp\active.dll
  • %Temp%\CR_1.tmp\detect.dll

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI OPR PATTERN File: 8.347.00
VSAPI OPR 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.IC

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • {malware file name} = {malware path and file name}

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_MOTMOT.IC. 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 do I enable or disable the Personal Firewall of Trend Micro Internet Security?

  • 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.


Did this description help? Tell us how we did.