Overview

overview

7

Static

static

3

loader.exe

windows11-21h2-x64

7

Analysis

  • user interaction
    yes
  • max time kernel
    39s
  • max time network
    14s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    06/08/2026, 04:07

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General

  • Target
    loader.exe
  • Size 18.0MB
  • Sample260806-ep4jwsdk7x
  • SHA256 a849e0c7741599b0fd60392d0eeb5d83e215f4f90795af60bf1ad20bd530cb9c
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
7/10
bootkitexecutionpersistence

Malware Config

Signatures

  • Executes dropped EXE 1 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Using powershell.exe command.

    execution
  • Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

    Bootkits write to the MBR to gain persistence at a level below the operating system.

    bootkitpersistence
  • Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs
  • Executes a command shell one-liner 1 TTPs 1 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

    execution
  • Modifies data under HKEY_USERS 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 1 IoCs
  • Suspicious behavior: RenamesItself 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\loader.exe
    "C:\Users\Admin\AppData\Local\Temp\loader.exe"
    1⤵
    • Suspicious use of NtCreateThreadExHideFromDebugger
    • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
    • Suspicious behavior: RenamesItself
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4580
    • C:\Users\Admin\AppData\Local\Temp\loader.exe
      "C:\Users\Admin\AppData\Local\Temp\loader.exe"
      2⤵
      • Executes dropped EXE
      • Writes to the Master Boot Record (MBR)
      • Modifies data under HKEY_USERS
      • Suspicious use of WriteProcessMemory
      PID:780
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /c powershell.exe -NoProfile -ExecutionPolicy Bypass -Command ^"^& { $encoded = 'QXBwIGluaXRpYWxpemF0aW9uIGVycm9yIDB4MTAz'; $text = [System.Text.Encoding]::UTF8.GetString([Convert]::FromBase64String($encoded)); $text = $text.Replace('\n', [Environment]::NewLine); Add-Type -AssemblyName PresentationFramework; [System.Windows.MessageBox]::Show($text, 'sync.top', 'OK', 'Error', 'None', 'DefaultDesktopOnly') }^"
        3⤵
        • Executes a command shell one-liner
        • Suspicious use of WriteProcessMemory
        PID:5544
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell.exe -NoProfile -ExecutionPolicy Bypass -Command "& { $encoded = 'QXBwIGluaXRpYWxpemF0aW9uIGVycm9yIDB4MTAz'; $text = [System.Text.Encoding]::UTF8.GetString([Convert]::FromBase64String($encoded)); $text = $text.Replace('\n', [Environment]::NewLine); Add-Type -AssemblyName PresentationFramework; [System.Windows.MessageBox]::Show($text, 'sync.top', 'OK', 'Error', 'None', 'DefaultDesktopOnly') }"
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:5084

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        __PSScriptPolicyTest_tcp503mu.tjq.ps1
        • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_tcp503mu.tjq.ps1
        • Size 60B
        • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        loader.exe
        • Path C:\Users\Admin\AppData\Local\Temp\loader.exe
        • Size 18.0MB
        • SHA256 3b2c4074bb5feb83e20de5e8a3d3ecd59c316c1a6c04b6610f42592c4c272db9
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/780-8-0x00007FF7717F0000-0x00007FF7739DB000-memory.dmp
        Download

        memory/780-23-0x00007FF7717F0000-0x00007FF7739DB000-memory.dmp
        Download

        memory/4580-0-0x00007FF65C180000-0x00007FF65E36B000-memory.dmp
        Download

        memory/4580-7-0x00007FF65C180000-0x00007FF65E36B000-memory.dmp
        Download

        memory/5084-21-0x000001A4CF240000-0x000001A4CF262000-memory.dmp
        Download