Analysis by: jasperm
ALIASES:

Microsoft : Exploit:Win32/CVE-2009-3129; Mcafee: Exploit-MSExcel.u !! ; Sophos: Troj/DocDrop-S

 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

It takes advantage of the Excel Featheader Record Memory Corruption Vulnerability.

This Trojan may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: 192,535 bytes
File Type: XLS
Memory Resident: No
Initial Samples Received Date: 06 Dec 2010
Payload: Downloads files

Arrival Details

This Trojan may be dropped by other malware.

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

Dropping Routine

This Trojan executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

Download Routine

This Trojan takes advantage of the following software vulnerabilities to download possibly malicious files:

  • Excel Featheader Record Memory Corruption Vulnerability

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.685.80
VSAPI PATTERN Date: 06 Dec 2010
VSAPI PATTERN Date: 12/6/2010 12:00:00 AM

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_EXELDROP.EP

Step 3

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


Did this description help? Tell us how we did.