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TROJ_SIREFEF.KN

October 17, 2013
 Analysis by: Sabrina Lei Sioting
 Modified by: Christopher Daniel So
 ALIASES:

Trojan:Win32/Sirefef.AA (Microsoft); Trojan.Zeroaccess!inf (Symantec); ZeroAccess.dr.gen.d (McAfee); Rootkit.Win32.ZAccess.wh (Kaspersky)

 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 arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It arrives as a component bundled with malware/grayware packages.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

5,120 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

10 Feb 2012

Arrival Details

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

It arrives as a component bundled with malware/grayware packages.

Other Details

This Trojan requires its main component to successfully perform its intended routine.

NOTES:

This Trojan executes the code stored in its extended attributes in the file system. It is registered as a service.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.766.04

FIRST VSAPI PATTERN DATE:

10 Feb 2012

VSAPI OPR PATTERN File:

8.767.00

VSAPI OPR PATTERN Date:

10 Feb 2012

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product and note files detected as TROJ_SIREFEF.KN

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the file detected as TROJ_SIREFEF.KN

[ 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 5

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