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TROJ_ARTIEF.NZY

October 08, 2012
 Analysis by: Roland Marco Dela Paz
 ALIASES:

Symantec: Trojan.Mdropper; Kaspersky: Exploit.MSWord.CVE-2010-3333.b

 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 takes advantage of the RTF Stack Buffer Overflow Vulnerability in order to drop malicious files into an affected system.

Once it exploits the said vulnerability, it drops a file, which is detected as TROJ_DROPR.VTG. This Trojan executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

Upon execution, it opens the non-malicious dropped file in order to hide its malicious routines from the user.

  TECHNICAL DETAILS

File Size:

142,361 bytes

File Type:

Other

Memory Resident:

No

Initial Samples Received Date:

17 Mar 2011

Payload:

Drops files

Installation

This Trojan drops the following non-malicious file:

  • %User Temp%\{malware filename}.doc

(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:

Other Details

Once a malware successfully exploits the said vulnerability, it causes the following actions to be done on the system:

It drops the file %User Temp%/update.exe, which is detected as TROJ_DROPR.VTG. This Trojan executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

(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.)

Upon execution, it opens the non-malicious dropped file %User Temp%\{malware filename}.doc in order to hide its malicious routines from the user.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.908.10

VSAPI OPR PATTERN Date:

17 Mar 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_ARTIEF.NZY

    • TROJ_DROPR.VTG

Step 3

Search and delete these files

[ 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%\{malware filename}.doc

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_ARTIEF.NZY. 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 5

Download and apply these security patches 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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