TROJ_MDROP.DLL
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Spammed via email
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
TECHNICAL DETAILS
439,917 bytes
DOC
No
19 Sep 2012
Drops files
Arrival Details
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Installation
This Trojan drops the following non-malicious file:
- %User temp%\~WINWORD
Dropping Routine
This Trojan drops the following files:
- %User Temp%\dw20.exe - detected by Trend Micro as BKDR_CHOSZ.DLL
It takes advantage of the following software vulnerabilities to drop malicious files:
It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
NOTES:
Upon execution, this trojan opens the dropped non-malicious .DOC file %User Temp%\~WINWORD in Microsoft Word to hide its malicious routines from the user.
SOLUTION
9.200
9.404.05
19 Sep 2012
9.405.00
19 Sep 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 3
Search and delete this file
- %User temp%\~WINWORD
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_MDROP.DLL. 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.
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