Analysis by: Karl Dominguez
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This malware arrives as an embedded .SWF file in the body of a malicious .DOC file detected by Trend Micro as TROJ_MDROP.SW.

This Trojan takes advantage of the following vulnerability in Adobe Flash Player to drop malicious file(s):

  • CVE-2011-0611

More information on the said vulnerability can be found in the following pages:

  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0611

  • http://www.adobe.com/support/security/bulletins/apsb11-07.html

It works with said malware to drop and execute another malicious file detected by Trend Micro as TROJ_DLOADR.WSA.

  TECHNICAL DETAILS

File Size: 1,517 bytes
File Type: SWF
Initial Samples Received Date: 22 Apr 2011
Payload: Drops files

NOTES:

It arrives as an embedded .SWF file in the body of a malicious .DOC file detected by Trend Micro as TROJ_MDROP.SW.

This Trojan takes advantage of the following vulnerability in Adobe Flash Player to drop malicious file(s):

  • CVE-2011-0611

More information on the said vulnerability can be found in the following pages:

  • http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0611
  • http://www.adobe.com/support/security/bulletins/apsb11-07.html

It works with the said malware to drop and execute the following malicious file detected by Trend Micro as TROJ_DLOADR.WSA:

  • %User Temp%\svchost.exe

  SOLUTION

Minimum Scan Engine: 8.900

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 SWF_EXPLOIT.WS

     TROJ_MDROP.SW
    TROJ_DLOADR.WSA

Step 3

Scan your computer with your Trend Micro product to delete files detected as SWF_EXPLOIT.WS. 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 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. http://www.adobe.com/support/security/bulletins/apsb11-07.html


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