Overview

overview

7

Static

static

3

loader.exe

windows10-2004-x64

7

loader.exe

windows11-21h2-x64

7

Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    15/05/2026, 17:13

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General

  • Target
    loader.exe
  • Size 18.0MB
  • Sample260515-vrtepsdt8x
  • 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
  • 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:1544
    • 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:2656
      • 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⤵
        • Suspicious use of WriteProcessMemory
        PID:2112
        • 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:4500

Network

        MITRE ATT&CK Enterprise v16

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        Downloads

        __PSScriptPolicyTest_ya3pnu21.bcf.ps1
        • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ya3pnu21.bcf.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 93a9d71c0247fc1c65effc1f673d0aa094003678fb948c7520b10458c68f4187
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/1544-0-0x00007FF6EAE30000-0x00007FF6ED01B000-memory.dmp
        Download

        memory/1544-7-0x00007FF6EAE30000-0x00007FF6ED01B000-memory.dmp
        Download

        memory/2656-8-0x00007FF7623B0000-0x00007FF76459B000-memory.dmp
        Download

        memory/2656-23-0x00007FF7623B0000-0x00007FF76459B000-memory.dmp
        Download

        memory/4500-22-0x000001A6B26F0000-0x000001A6B2712000-memory.dmp
        Download