TROJ_ADOBFP.SM

March 18, 2011
 Analysis by: Erika Bianca Mendoza
 ALIASES:

Exploit.SWF.CVE-2011-0609.a (GFI-Sunbelt)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan is noteworthy due to the increased potential for damage, propagation, or both, that it possesses. Specifically, it exploits a zero-day vulnerability in Adobe Flash Player in order to drop and execute other malicious files onto the infected system.

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

This is the Trend Micro detection for .XLS files that has embedded malicious .SWF. The said embedded .SWF exploits a vulnerability in Adobe Flash Player 10.2.152.33 and earlier versions. When exploited, this Trojan drops other malware. From the samples we have received, it drops BKDR_POISON.SMI and TROJ_DROPPER.ADO. As a result, the malicious routines of the said malware are also exhibited in the system.

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size:

108,032 bytes

File Type:

XLS

Initial Samples Received Date:

14 Mar 2011

Payload:

Drops files

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

Other Details

This Trojan is a zero-day exploit for the following vulnerability:

  • Unspecified vulnerability in Adobe Flash Player

More information on this vulnerability can be found below:

NOTES:

This is the Trend Micro detection for .XLS files that has embedded malicious .SWF.

Upon exploiting the said vulnerability, this Trojan drops other malware. From the samples we have received, it drops BKDR_POISON.SMI and TROJ_DROPPER.ADO. As a result, the malicious routines of the said malware are also exhibited in the system.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.907.00

VSAPI OPR PATTERN Date:

16 Mar 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_ADOBFP.SM

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_ADOBFP.SM. 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.

NOTES:

Mitigation

Users are advised to perform mitigation steps found in the following Abode Web page:


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