Backdoor.Win64.HOMESHOCK.ZBJH

August 30, 2022
 Analysis by: Jeffrey Francis Bonaobra
 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • 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.

It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size:

142311936 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

18 Aug 2022

Payload:

Connects to URLs/IPs, Collects system information

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.

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

  • Impersonate tokens
  • Execute arbitrary commands
  • Manage files (Create, Delete, Rename, Copy)
  • Manage directories (Create, Remove, Set Directory)
  • Manage processes (List, Create, Suspend, Terminate)
  • Inject code into processes
  • Connect and disconnect to a named pipe
  • Escalate privileges

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

  • https://{BLOCKED}dated.com/Restrict/v8.53/BUIRIF66U
  • https://{BLOCKED}dated.com/upset/captcha/9BFIB3IUPO2I

Information Theft

This Backdoor gathers the following data:

  • User Name
  • Computer Name
  • Process File Name
  • OS Version

Other Details

This Backdoor does the following:

  • It requires a specific user name to proceed with its intended routine.
  • It appends the following to the requests as additional header:
      Cookie: EX1P_MTOU2WHWMVBJA61IGMLJIUTKDBDM3JQ4={Encoded Stolen Information}

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.770.08

FIRST VSAPI PATTERN DATE:

24 Aug 2022

VSAPI OPR PATTERN File:

17.771.00

VSAPI OPR PATTERN Date:

25 Aug 2022

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.XXPE50FFF059

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

Identify and terminate files detected as Backdoor.Win64.HOMESHOCK.ZBJH

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 5

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win64.HOMESHOCK.ZBJH. 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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