Analysis by: Christopher Daniel So
 Modified by: Erika Bianca Mendoza
ALIASES:

Exploit:SWF/CVE-2011-0609.C (Microsoft); Trojan-Dropper.MSExcel.SwfDrop.c (Kaspersky); Exploit-MSExcel.h (McAfee)

 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 arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size: 217,144 bytes
File Type: XLS
Initial Samples Received Date: 20 Mar 2011
Payload: Drops files

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

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

Other Details

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

More information on this vulnerability can be found below:

It does the following:

  • Drops and executes the %UserTemp%\alg.exe after successfully exploiting the said vulnerability. Trend Micro detects this as BKDR_DEMTRAN.SM.
  • Creates the non-malicious file, %UserTemp%\20100323.xls, and opens it to avoid suspicion. The said file contains information related to the emailed subject.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 7.914.06
FIRST VSAPI PATTERN DATE: 20 Mar 2011
VSAPI OPR PATTERN File: 7.915.00
VSAPI OPR PATTERN Date: 20 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.SMA

Step 3

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

Recommendation

Users are advised to follow the solution from this Web page:


Did this description help? Tell us how we did.

Related Malware