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TROJ_NETHOOK.A

October 09, 2012
 Analysis by: Christopher Daniel So
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

18,880 bytes

File Type:

SYS

Memory Resident:

Yes

Initial Samples Received Date:

08 May 2012

Arrival Details

This Trojan may be dropped by the following malware:

  • TSPY_THOPER.AD

NOTES:
It hooks the Native API functions ZwSaveKey and ZwQueryValueKey to hide itself. It also hooks the handler of the devices \Device\Tcp and \Driver\nsiproxy to monitor network activities.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.118.04

FIRST VSAPI PATTERN DATE:

18 May 2012

VSAPI OPR PATTERN File:

9.119.00

VSAPI OPR PATTERN Date:

18 May 2012

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 the malware/grayware file that dropped/downloaded TROJ_NETHOOK.A

Step 3

Scan your computer with your Trend Micro product and note files detected as TROJ_NETHOOK.A

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

Search and delete the file detected as TROJ_NETHOOK.A

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_NETHOOK.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.


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