Analysis by: Sabrina Lei Sioting
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This malware may arrive via network shares.

It drops copies of itself in all directories where AutoCAD drawing file are located.

This worm arrives via removable drives.

  TECHNICAL DETAILS

File Size: 40,893 bytes
File Type: LSP
Memory Resident: No
Initial Samples Received Date: 30 Jun 2011

Arrival Details

This worm arrives via removable drives.

It may arrive via network shares.

NOTES:

It modifies the following file to enable itself to load when drawing files are opened:

  • {Support Folder of AutoCAD}\acad.mnl

It drops the following copies of itself in all directories where AutoCAD drawing file are located:

  • acaddoc.lsp
  • acad.lsp

This enables the malware to propagate through all drives.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.258.08
FIRST VSAPI PATTERN DATE: 30 Jun 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 ALS_BURSTED.ACE. 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.

NOTES:
Please refer to the following link for addtional steps in removing the malware:


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