Author: Erika Bianca Mendoza   
 Modified By:: Sabrina Lei Sioting

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVER ALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
Low
Medium
High
Critical

  • Threat Type:
    Trojan

  • Destructiveness:
    No

  • Encrypted:
    No

  • In the wild:
    Yes

  OVERVIEW

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

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

  TECHNICAL DETAILS

File size: 736,158 bytes
File type: RTF
Memory resident: No
INITIAL SAMPLES RECEIVED DATE: 07 września 2011
PAYLOAD: Drops files

Arrival Details

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

Installation

This Trojan drops the following non-malicious file:

  • %User Temp%\Wor.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:

  • (MS10-087) Vulnerabilities in Microsoft Office Could Allow Remote Code Execution

Other Details

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

  • It drops %User Temp%\calc.exe, which is detected as TROJ_SMALL.QUIM.

(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.)

NOTES:

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

  SOLUTION

Minimum scan engine: 9.200
First VSAPI Pattern File: 8.410.02
First VSAPI Pattern Release Date: 07 września 2011
VSAPI OPR PATTERN-VERSION: 8.411.00
VSAPI OPR PATTERN DATE: 07 września 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.QUIM

     TROJ_SMALL.QUIM

Step 3

Search and delete these files

[ learnMore ]
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%\Wor.doc

Step 4

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