TROJ_BKDROP.A
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Upon execution, it open the non-malicious dropped .DOC file %User Temp%\20100430{characters}.doc in order to hide its malicious routines from the user.
This Trojan arrives as attachment to mass-mailed email messages.
It bears the file icons of certain applications to avoid easy detection and consequent removal.
It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
TECHNICAL DETAILS
356,352 bytes
No
09 May 2011
Arrival Details
This Trojan arrives as attachment to mass-mailed email messages.
Installation
This Trojan drops the following files:
- %User Temp%\iexplorer.exe - detected as BKDR_INJECT.ZKXW
(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.)
It drops the following non-malicious file:
- %User Temp%\20100430{characters}.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.)
It bears the file icons of the following applications:
- Microsoft Word Document File
Dropping Routine
This Trojan executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
NOTES:
Upon execution, it open the non-malicious dropped .DOC file %User Temp%\20100430{characters}.doc in order to hide its malicious routines from the user.
SOLUTION
8.900
*under processing
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_BKDROP.A
- BKDR_INJECT.ZKXW
Step 3
Search and delete this file
- %User Temp%\20100430{characters}.doc
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_BKDROP.A. 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.
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