Backdoor.Win64.SNIPBOT.THIBFBD

 Analysis by: Leidryn Saludez

 ALIASES:

Trojan:Win64/Sheheq.AT!MTB (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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

  TECHNICAL DETAILS

File Size:

151,552 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

25 Sep 2024

Payload:

Collects system information, Connects to URLs/IPs, Drops files

Arrival Details

This Backdoor 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 Backdoor drops the following files:

  • keyprov.dll
  • single.dll
  • %AppDataLocal%/temp.cmd

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

  • %AppDataLocal%temp.cmd %AppDataLocal%\Local\KeyStore
  • cmd /C taskkill /f /im explorer.exe && start explorer.exe → restart Explorer

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • SnipMutex

Other System Modifications

This Backdoor adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\SOFTWARE\AppDataHigh\
Software
state1 = single.dll

Backdoor Routine

This Backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}eapi.com

Information Theft

This Backdoor gathers the following data:

  • Computer / Domain name
  • MAC address
  • Windows build number
  • If Windows server

Other Details

This Backdoor adds the following lines or registry entries as part of its routine:

  • HKEY_Current_User\SOFTWARE\AppDataHigh\Software
  • HKEY_Current_User\SOFTWARE\AppDataHigh
  • HKEY_Current_User\SOFTWARE\Classes\CLSID\{SID}\InprocServer32

It does the following:

  • It connects to the C2 server to download earlier versions of the following payloads and inject it into Explorer:
    • keyprov.dll
    • single.dll
  • It decrypts and execute the DLL payloads downloaded from the C2 server.
  • It listens on port 1342 for the following incoming string commands sent over TCP.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.614.02

FIRST VSAPI PATTERN DATE:

26 Sep 2024

VSAPI OPR PATTERN File:

19.615.00

VSAPI OPR PATTERN Date:

27 Sep 2024

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

     TROJ.Win32.TRX.XXPE50FFF085

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 4

Delete this 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_CURRENT_USER\SOFTWARE\AppDataHigh\Software
    • state1 = single.dll
  • In HKEY_Current_User\SOFTWARE\AppDataHigh\Software
  • In HKEY_Current_User\SOFTWARE\AppDataHigh
  • In HKEY_Current_User\SOFTWARE\Classes\CLSID\{SID}\InprocServer32

Step 5

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • keyprov.dll
  • single.dll
  • %AppDataLocal%/temp.cmd

Step 6

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win64.SNIPBOT.THIBFBD. 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 the following Trend Micro Support pages for more information:


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