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TROJ_MDROP.REF
Aliases: Exploit:SWF/CVE-2013-0634 (Microsoft)
Malware type: Trojan
Destructive: No
Platform: Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Encrypted: No
In the wild: Yes

Overview


Infection Channel: Downloaded from the Internet, Dropped by other malware

This malware takes advantage of zero-day vulnerabilities in Adobe Flash Player to drop malicious files.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Technical Details


File size: 580,608 bytes
File type: DOC
Initial samples received date: 08 Feb 2013
Payload: Drops files

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops and executes the following files:

  • %User Temp%\abc.cfg - detected as BKDR_PLUGAX.A

(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

NOTES:

It contains an embedded SWF file, detected by Trend Micro as SWF_EXPLOIT.MC, which is used for its dropping routine.

Solution


Minimum scan engine: 9.300
First VSAPI Pattern File: 9.714.03
First VSAPI Pattern Release Date: 08 Feb 2013
VSAPI OPR Pattern Version: 9.715.00
VSAPI OPR Pattern Release Date: 09 Feb 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove malware/grayware files dropped/downloaded by TROJ_MDROP.REF

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_MDROP.REF. 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 4

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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Analysis By: Mark Joseph Manahan

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