TROJ_MDROP.ZPE

March 11, 2013
 Analysis by: Nikko Tamana
 ALIASES:

Troj/DocDrop-S (Sophos), MSExcel/CVE_2009_3129.A!exploit (Fortinet), Exploit/XLS.gen (FProt),

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware, Via email

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

XLS

Memory Resident:

Yes

Initial Samples Received Date:

27 Feb 2013

Payload:

Drops files, Compromises system security

Arrival Details

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

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops and executes the following files:

  • %User Temp%\svohost.exe - Detected as BKDR_NFLOG.AU

(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Dropping Routine

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

  • Vulnerabilities in Microsoft Office Excel Could Allow Remote Code Execution

Other Details

More information on this vulnerability can be found below:

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.756.02

FIRST VSAPI PATTERN DATE:

27 Feb 2013

VSAPI OPR PATTERN File:

9.757.00

VSAPI OPR PATTERN Date:

28 Feb 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • BKDR_NFLOG.AU

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_MDROP.ZPE. 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 these security patches 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://technet.microsoft.com/en-us/security/bulletin/MS09-067

NOTES:

Close all Microsoft Excel applications before scanning with your Trend Micro product.


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