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TROJ_SIREFEF.ASN

May 01, 2013
 Analysis by: Mark Joseph Manahan
 ALIASES:

Trojan:Win32/Sirefef.BC (Microsoft)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 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 exports functions used by other malware.

  TECHNICAL DETAILS

File Size:

49,152 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

20 Apr 2013

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.

Installation

This Trojan drops the following copies of itself into the affected system:

  • %System%/z

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other Details

This Trojan exports functions used by other malware.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.866.06

FIRST VSAPI PATTERN DATE:

20 Apr 2013

VSAPI OPR PATTERN File:

9.867.00

VSAPI OPR PATTERN Date:

20 Apr 2013

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

Remove the malware/grayware file that dropped/downloaded TROJ_SIREFEF.ASN

Step 3

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