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X97M_RAWO.AR

October 09, 2012
 Analysis by: Jasen Sumalapao
 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.

It executes downloaded files whose malicious routines are exhibited by the affected system.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

XLS, DOC, VBS

Initial Samples Received Date:

27 Jun 2012

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.

Download Routine

This file infector executes downloaded files :

  • \{BLOCKED}0.{BLOCKED}7.30.118\hostpo\SCR.EXE
whose malicious routines are exhibited by the affected system.

NOTES:
This malware is the detection for an infected Microsoft Excel file. It checks for open Microsoft Excel workbooks on the affected computer.

It then checks if a Sheet17 exists in the open workbooks. If not, it creates a hidden worksheet named Sheet17 and copies the content from the infected MS Excel file to the open workbook.