X97M_LAROUX.DA

 Analysis by: Christopher Daniel So

 ALIASES:

Virus:X97M/Laroux.PA (Microsoft), X97M.Laroux.JO (Symantec), X97M/Laroux (McAfee), Virus.MSExcel.Laroux.ja (Kaspersky)

 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

  TECHNICAL DETAILS

File Size:

Varies

Memory Resident:

Yes

Initial Samples Received Date:

29 Dec 2009

Arrival Details

This malware arrives via the following means:

  • Opening Microsoft Excel workbook files infected with this malware

Installation

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

  • %User Profile%\Application Data\Microsoft\Excel\XLSTART\StartUp.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 file types:

  • Microsoft Office Excel Workbook (*.xls)