Analysis by: Kathleen Notario
 Modified by: Christopher Daniel So
ALIASES:

Virus:ALisp/Bursted.AD (Microsoft), ALS.Bursted.B (Symantec), ALS/Bursted (McAfee), Virus.Acad.Bursted.e (Kaspersky)

 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 worm arrives on the system as an AutoLISP script bundled with a drawing file (.DWG). Once the drawing file is opened, AutoCAD then loads and executes this malware.

  TECHNICAL DETAILS

File Size: Varies
File Type: LSP
Initial Samples Received Date: 13 Jan 2012

NOTES:

This worm arrives on the system as an AutoLISP script bundled with a drawing file (.DWG). Once the drawing file is opened, AutoCAD then loads and executes this malware.

Upon execution, it loads a certain AutoLISP script named, acadapq.lsp. If the folder where the file base.dcl does not contain acaddoc.lsp, it copies itself to the folder where the file base.dcl is, as acaddoc.lsp.

If the folder where the current drawing file exists does not contain acaddoc.lsp, it copies itself to the folder where the current drawing file is, as acaddoc.lsp.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 8.706.04
FIRST VSAPI PATTERN DATE: 13 Jan 2012
VSAPI OPR PATTERN File: 8.707.00
VSAPI OPR PATTERN Date: 14 Jan 2012

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product to delete files detected as ALS_BURSTED.SM. 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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