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TROJ_MDROPPER.CD

October 09, 2012
 Analysis by: Lord Alfred Remorin
 ALIASES:

Exploit:Win32/CVE-2012-0158 (Microsoft), Trojan.Mdropper (Symantec), Exp/20120158-A (Sophos)

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

  TECHNICAL DETAILS

File Size:

186,864 bytes

File Type:

RTF

Memory Resident:

Yes

Initial Samples Received Date:

15 Aug 2012

Arrival Details

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

Installation

This Trojan drops and executes the following files:

  • %User Temp%\WINWORD.EXE - detected as TSPY_FLAME.M

(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 takes advantage of the following software vulnerabilities to drop malicious files:

NOTES:

Upon execution, this Trojan drops and opens a document file to hide its malicious routines from the user.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.326.08

FIRST VSAPI PATTERN DATE:

15 Aug 2012

VSAPI OPR PATTERN File:

9.327.00

VSAPI OPR PATTERN Date:

15 Aug 2012

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 the malware/grayware file that dropped/downloaded TROJ_MDROPPER.CD

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_MDROPPER.CD. 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 4

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.  


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