Analysis by: Rhena Inocencio
ALIASES:

X97M/Laroux (McAfee), X97M.Laroux.gen (Symantec), XM/Laroux-AP (Sophos)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This file infector arrives by opening .XLS files which are infected by this malware. It drops the copies of itself into affected system. It infects certain files.

  TECHNICAL DETAILS

File Size: Varies
File Type: XLS
Initial Samples Received Date: 15 Aug 2012

Arrival Details

This malware arrives via the following means:

  • Opening .XLS files which are infected by this malware

Installation

This file infector drops the following copies of itself into the affected system:

  • %User Profile%\Application Data\Microsoft\Excel\XLSTART\1006（潘）.xls

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

File Infection

This file infector infects the following files:

  • .XLS

  SOLUTION

Minimum Scan Engine: 9.200
VSAPI OPR PATTERN File: 9.327.00
VSAPI OPR PATTERN Date: 15 Aug 2012

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

Scan your computer with your Trend Micro product to clean files detected as X97M_LAROUX.ZH. 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.


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