LNK_STUXNET.A

July 16, 2010
 Analysis by: Christopher Daniel So
 PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Trend Micro has flagged this threat as noteworthy due to the increased potential for damage, propagation, or both, that it possesses.

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

It executes the file \\.\STORAGE#RemovableMedia#\{system ID}\{random characters}.tmp. It exploits a vulnerablity in Windows Shell that could allow arbitrary commands to be executed

More information on this vulnerability can be found below:

Vulnerability in Windows Shell Could Allow Remote Code Execution (2286198)

This Trojan may be downloaded by other malware/grayware from remote sites.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

4,171 bytes

File Type:

LNK

Memory Resident:

No

Initial Samples Received Date:

16 Jul 2010

Payload:

Exploits a known vulnerability

Arrival Details

This Trojan may be downloaded by the following malware/grayware from remote sites:

  • WORM_STUXNET.A

Dropping Routine

This Trojan executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

Other Details

Based on analysis of the codes, it has the following capabilities:

  • Executes the file \\.\STORAGE#RemovableMedia#\{system ID}\{random characters}.tmp
  • Exploits a vulnerablity in Windows Shell that could allow arbitrary commands to be executed

More information on this vulnerability can be found below:

  • Vulnerability in Windows Shell Could Allow Remote Code Execution (2286198)

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.313.00

VSAPI OPR PATTERN Date:

15 Jul 2010

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 LNK_STUXNET.A

Step 3

Scan your computer with your Trend Micro product to delete files detected as LNK_STUXNET.A. 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.

Step 4

Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors. Vulnerability in Windows Shell Could Allow Remote Code Execution (2286198)

Note: To identify STUXNET-infected systems within a network, administrators can use Trend Micro's special STUXNET Scanner Tool. For more details, download and extract the package and refer to the tool's incorporated text file.


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