Analysis by: Erika Bianca Mendoza
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This malware shares code similarities with the STUXNET malware.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This is the Trend Micro detection for the encrypted DLL files of TROJ_DUQU malware family.

It arrives as a dropped file of another malware, with other certain files.

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 233,472 bytes
File Type: Other
Initial Samples Received Date: 01 Nov 2011

Arrival Details

This Trojan may be dropped by other malware.

NOTES:

This is the Trend Micro detection for the encrypted DLL files of TROJ_DUQU malware family.

It arrives as a dropped file of another malware.

It also arrives with the following files:

  • %System%\Drivers\allide1.sys
  • %Windows%\inf\iddr022.pnf - TROJ_DUQU.CF

The .SYS file is responsible in decrypting and loading TROJ_DUQU.EN. The result of this routine is a .DLL file detected by Trend Micro as TROJ_DUQU.DEC.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.540.07
FIRST VSAPI PATTERN DATE: 01 Nov 2011
VSAPI OPR PATTERN File: 8.541.00
VSAPI OPR PATTERN Date: 01 Nov 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

Remove malware files dropped/downloaded by TROJ_DUQU.EN

Step 3

Search and delete this file

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • %System%\Drivers\allide1.sys

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DUQU.EN. 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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