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X97M_LAROUX.BK

November 08, 2012
 PLATFORM:

Windows 98, Windows ME, Windows NT, Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Others

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This macro virus may be dropped by other malware. It may be downloaded unknowingly by a user when visiting malicious Web sites.

It hooks the macro Auto_Open(). It first checks for the file STARTUP.XLS in the XLSTART folder. If it does not exist, it saves the active workbook as STARTUP.XLS in the said folder.

It infects Microsoft Office Excel worksheet files by creating a macro module named StartUp, which contains the virus code.

  TECHNICAL DETAILS

File Size:

15,360 bytes

File Type:

XLS

Initial Samples Received Date:

13 Jan 2010

Payload:

Infects Microsoft Office Excel files

NOTES:

This macro virus may be dropped by other malware. It may be downloaded unknowingly by a user when visiting malicious Web sites.

It hooks the macro Auto_Open(). It first checks for the file STARTUP.XLS in the XLSTART folder. If it does not exist, it saves the active workbook as STARTUP.XLS in the said folder.

It infects Microsoft Office Excel worksheet files by creating a macro module named StartUp, which contains the virus code.

It infects systems running on Windows 98, ME, NT, 2000, XP, and Server 2003 where Microsoft Office Excel is installed.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

6.774.03

FIRST VSAPI PATTERN DATE:

16 Jan 2010

VSAPI OPR PATTERN File:

6.803.00

VSAPI OPR PATTERN Date:

25 Jan 2010

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_LAROUX.BK. 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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