Analysis by: Sabrina Lei Sioting
 Modified 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: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan attempts to drop a malicious file.

However, due to errors in its code, it fails to perform its intended routine.

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It may be unknowingly downloaded by a user while visiting malicious websites.

It takes advantage of an unknown vulnerability in a certain software to allow a remote malicious user or malware to download files on the affected machine. It takes advantage of certain vulnerabilities.

  TECHNICAL DETAILS

File Size: 242,735 bytes
File Type: RTF
Initial Samples Received Date: 11 Mar 2011
Payload: Drops files

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It may be unknowingly downloaded by a user while visiting malicious websites.

Other Details

This Trojan takes advantage of an unknown vulnerability in a certain software to allow a remote malicious user or malware to download files on the affected machine.

More information on this vulnerability can be found below:

It takes advantage of the following vulnerabilities:

  • RTF Stack Buffer Overflow Vulnerability

NOTES:
It attempts to drop the following malicious file:

  • %User Temp%\setup.exe

However, due to errors in its code, it fails to perform its intended routine.

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI OPR PATTERN File: 7.787.00
VSAPI OPR PATTERN Date: 22 Jan 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

Scan your computer with your Trend Micro product to delete files detected as TROJ_MDROP.FV. 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 3

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.

NOTES:


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