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Aliases: Exploit:Win32/CVE-2010-3333 [Microsoft]; Exploit.MSWord.CVE-2010-3333.b [Kaspersky]; Trojan.Mdropper [Symantec]
Malware type: Trojan
Destructive: No
Platform: Windows 2000, XP, Server 2003
In the wild: Yes


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

Technical Details

File size: 150,528 bytes
File type: Other
Memory resident: No
Initial samples received date: 06 Apr 2011
Payload: Drops files


This Trojan drops the following non-malicious file:

  • c:\{ascii characters}.doc

Dropping Routine

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

  • RTF Stack Buffer Overflow Vulnerability (CVE-2010-3333) -

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%\WINWORD.EXE, which is detected as BKDR_IRCBOT.KER

(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.)

More information on this vulnerability can be found below:


Minimum scan engine: 8.900
First VSAPI Pattern File: 7.954.14
First VSAPI Pattern Release Date: 06 Apr 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.KER


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.
c:\{ascii characters}.doc

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_ARTIEF.KER. 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.
Vulnerabilities in Microsoft Office Could Allow Remote Code Execution (2423930)

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Analysis By: Sabrina Lei Sioting

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