arrow_back
search
close

ALS_PASSDOC.AD

October 09, 2012
 Analysis by: Cris Nowell Pantanilla
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This worm 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:

Varies

File Type:

LSP

Memory Resident:

No

Initial Samples Received Date:

11 Jan 2012

Payload:

Drops files

Arrival Details

This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

NOTES:

It is an AutoCAD LISP script that spreads by copying itself to AutoCAD's working folder. If first locates the directory of the following files:

  • ACAD.MNL
  • ACAD.EXE
  • DWGNAME
It then drops copies of itself as:
  • {path of ACAD.MNL}\acaddoc.lsp
  • {path of ACAD.EXE}\support\acaddoc.lsp
  • {path of DWGNAME}\acaddoc.lsp

When an AutoCAD drawing file is opened, this script is also executed. It disables the following AutoCAD commands:

  • EXPLODE
  • LINE
  • XREF
It sets the values of the following Autocard variables to 1 as part of its installation routine:
  • ACADLSPASDOC
  • cmdecho
  • sdi

It also loads the file acadapq.lsp.

  SOLUTION

Minimum Scan Engine:

9.200

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_PASSDOC.AD. 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.


Did this description help? Tell us how we did.