Analysis by: Michael Cabel
 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 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: 117,248 bytes
File Type: XLS
Initial Samples Received Date: 10 Aug 2011

Arrival Details

This file infector 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 malware is the detection for an infected MS Excel file. It checks for open MS 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.

It then creates the menu option ARAY eleven (11) times. The said option has the sub-menu Joanes, which also contains a sub-menu named Joanes. Sub-menus are created fifteen (15) times for each of the main menu option.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.347.80
FIRST VSAPI PATTERN DATE: 10 Aug 2011
VSAPI OPR PATTERN File: 8.349.00
VSAPI OPR PATTERN Date: 10 Aug 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 clean files detected as X97M_RAWO.DMG. 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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