Analysis by: Bren Matthew Ebriega
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

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 connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size: 404,090 bytes
File Type: Other
Memory Resident: Yes
Initial Samples Received Date: 19 Aug 2021
Payload: Connects to URLs/IPs, Steals information

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 adds the following processes:

  • notepad.exe → if injection to lsass.exe fails.

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

  • Global\{Generated Numbers}

It injects codes into the following process(es):

  • powershell.exe
  • notepad.exe
  • explorer.exe
  • lsass.exe
  • winlogon.exe

Information Theft

This Trojan gathers the following data:

  • Username
  • Computer Name
  • Volume Serial Number
  • OS Version
  • OS Architecture

Other Details

This Trojan connects to the following website to send and receive information:

  • cdn-{BLOCKED}us-akamai.com

It does the following:

  • It looks for the following registry key and value which it will load and execute its contents in its memory:
    • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{Generated CLSID 1}
      {Generated CLSID 2} = {Hex Values}
  • It generates CLSID Values using the following data:
    • Computer Name of the infected machine.
    • Volume Serial Number of the infected machine.
  • It will only continue to its malicious routine if:
    • The registry generated registry key and value names exists on the machine.
    • It is not ran by the following:
      • rundll32.exe
      • powershell.exe
      • TestStarter.exe
      • TestService.exe
    • It doesn't contain the follwing string in its commandline:
      • -em
  • It checks for the existence of the following anti-virus software:
    • bitdefender
    • sophos
    • windows defender
    • symantec
    • norton
    • trend micro

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.924.08
FIRST VSAPI PATTERN DATE: 24 Aug 2021
VSAPI OPR PATTERN File: 16.925.00
VSAPI OPR PATTERN Date: 25 Aug 2021

Step 1

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 2

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 3

Restart in Safe Mode

[ Learn More ]

Step 4

Identify and terminate files detected as Trojan.Win32.BOXTER.REG

[ 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

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.Win32.BOXTER.REG. 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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