TROJ_EXLDROP.SM

October 08, 2012
 Analysis by: Roland Marco Dela Paz
 Modified by: Erika Bianca Mendoza
 ALIASES:

Microsoft: Exploit:Win32/CVE-2009-3129; Kaspersky: Exploit.MSExcel.CVE-2009-3129.h; Mcafee: Exploit-MSExcel.u !!

 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 takes advantage of certain vulnerabilities.

  TECHNICAL DETAILS

File Size:

116,247 bytes

File Type:

XLS

Memory Resident:

No

Initial Samples Received Date:

08 Apr 2011

Arrival Details

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

Installation

This Trojan drops and executes the following files:

  • %User Temp%\moon.exe - detected by Trend Micro as BKDR_WOODINI.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.)

Other Details

More information on this vulnerability can be found below:

It takes advantage of the following vulnerabilities:

NOTES:

To avoid suspicion, it creates and opens a non-malicious .XLS file in the following temporary folder:

  • %User Temp%\Libya.xls

  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 TROJ_EXLDROP.SM

Step 3

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

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.


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