Analysis by: Roland Dela Paz

ALIASES:

Hacktool.Rootkit (Symantec); Mal/GSPFX-A (Sophos)

 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 Trojan may be dropped by other malware.

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

  TECHNICAL DETAILS

File Size: 53,888 bytes
File Type: SYS
Memory Resident: Yes
Initial Samples Received Date: 17 Jun 2011

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_FAKEAV.SMDJ

Other Details

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

NOTES:
It is usually dropped by its mother component as follows:

  • %System%\drivers\vbma{random}.sys

It is used by its main malware for disabling antivirus products and forensic tools. It does the said routine by terminating and modifying the Access Control List (ACL) of a found process, thus, effectively making it unable to execute.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.362.09
FIRST VSAPI PATTERN DATE: 18 Jun 2011

Step 1

For Windows ME and XP 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 RTKT_SIREFEF.AD

     TROJ_FAKEAV.SMDJ

Step 3

Identify and delete files detected as RTKT_SIREFEF.AD using either the Startup Disk or Recovery Console

[ Learn More ]

Step 4

Scan your computer with your Trend Micro product to delete files detected as RTKT_SIREFEF.AD 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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