TROJ_DUQU.ENC

October 21, 2011
 Analysis by: Karl Dominguez
 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.

The malware RTKT_DUQU.SME is responsible in decryting and loading TROJ_DUQU.ENC. The result of this routine is a .DLL file detected by Trend Micro as TROJ_DUQU.DEC.

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

DLL

Initial Samples Received Date:

19 Oct 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 as any of the following:

  • %Windows%\inf\cmi4432.pnf
  • %Windows%\inf\netp191.pnf

It also arrives with the following files:

  • %System%\Drivers\cmi4432.sys - RTKT_DUQU.SME
  • %System%\Drivers\jminet7.sys - RTKT_DUQU.SME
  • %Windows%\inf\cmi4464.pnf - TROJ_DUQU.CFG
  • %Windows%\inf\netp192.pnf - TROJ_DUQU.CFG

The malware RTKT_DUQU.SME is responsible in decrypting and loading TROJ_DUQU.ENC. The result of this routine is a .DLL file detected by Trend Micro as TROJ_DUQU.DEC.

  SOLUTION

Minimum Scan Engine:

9.200

VSAPI OPR PATTERN File:

8.509.00

VSAPI OPR PATTERN Date:

20 Oct 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.ENC

Step 3

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