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X97M_MICRO.A

October 09, 2012
 Analysis by: Abraham Latimer Camba
 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 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:

No

Initial Samples Received Date:

01 Jan 2011

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 infected Microsoft Excel files which contain malicious macro script codes.

It utilizes the auto_open macro command, consequently infecting other workbooks once opened.

This script also intercepts the use of two function buttons in Microsoft Excel, namely the F8 and F11 buttons. Pressing these allows the macro script to be executed.

  SOLUTION

Minimum Scan Engine:

9.200

VSAPI OPR PATTERN File:

7.739.00

VSAPI OPR PATTERN Date:

01 Jan 2011

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 delete files detected as X97M_MICRO.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.


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