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TROJ_GOOTKIT.FR

October 09, 2012
 Analysis by: Cris Nowell Pantanilla
 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 arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It is injected into all running processes to remain memory resident.

  TECHNICAL DETAILS

File Size:

157,184 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

23 Sep 2011

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.

Installation

This Trojan is injected into all running processes to remain memory resident.

Autostart Technique

This Trojan modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
netsvcs = "{Default Values} BODfR3vVBt"

(Note: The default value data of the said registry entry is "{Default Values}".)

It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\BODfR3vVBt

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\BODfR3vVBt

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}7.{BLOCKED}9.4.4:8082/get
  • http://{BLOCKED}GO.COM/
  • http://{BLOCKED}PARTMENTS.COM/
  • http://{BLOCKEDHIROPRACTIC.COM/
  • http://{BLOCKED}ESANCENEZ.COM/
  • http://{BLOCKED}ERAMIC.COM/
  • http://{BLOCKED}irstblood.com:5190

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.450.04

FIRST VSAPI PATTERN DATE:

23 Sep 2011

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

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

 
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
    • BODfR3vVBt
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • BODfR3vVBt

Step 4

Restore this modified registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost
    • From: netsvcs = "{Default Values} BODfR3vVBt"
      To: netsvcs = "{Default Values}"

Step 5

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