Analysis by: Byron Jon Gelera
ALIASES:

Virus.MSExcel.Laroux-based (Kaspersky); Virus:X97M/Laroux.HT (Microsoft)

 PLATFORM:

Windows

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

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This file infector 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: 83,968 bytes
File Type: XLS
Memory Resident: No
Initial Samples Received Date: 30 Sep 2016

Arrival Details

This file infector 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.

NOTES:

This is the Trend Micro detection for encoded samples of XM_LAROUX variants.

This malware infects Microsoft Office Excel files.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 12.808.03
FIRST VSAPI PATTERN DATE: 30 Sep 2016
VSAPI OPR PATTERN File: 12.809.00
VSAPI OPR PATTERN Date: 01 Oct 2016

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

Scan your computer with your Trend Micro product to clean files detected as X2KM_LAROUX.A. 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.


Did this description help? Tell us how we did.