Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260710-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260710-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    18/07/2026, 22:12

General

  • Target
    MasonService.exe
  • Size 2.6MB
  • Sample260718-14f8ssd17l
  • SHA256 9f7bf14ba4ebd047fe0382abd5d411575f137327faf6aa022f4fa3128291537a
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Family: DonutLoader

    DonutLoader is a position-independent code that enables in-memory execution of VBScript, JScript, EXE, DLL files and dotNET assemblies.

  • Family: Umbral

    Umbral stealer is an open-source modular stealer written in C#.

  • Detects DonutLoader 1 IoCs
  • Detects Umbral payload 1 IoCs
  • Creates new service(s) 2 TTPs
  • Executes dropped EXE 2 IoCs
  • Stops running service(s) 4 TTPs
  • Contacts third-party web service commonly abused for C2 1 TTPs 7 IoCs

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

  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Drops file in System32 directory 2 IoCs
  • Drops file in Windows directory 8 IoCs
  • Launches sc.exe 6 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 33 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Detects videocard installed 1 TTPs 6 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Disables Windows logging functionality 2 TTPs

    Changes registry settings to disable Windows Event logging.

  • Modifies data under HKEY_USERS 11 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 31 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\MasonService.exe
    "C:\Users\Admin\AppData\Local\Temp\MasonService.exe"
    1⤵
    • Drops file in System32 directory
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2448
    • C:\Windows\SysWOW64\MasonService.exe
      "C:\Windows\System32\MasonService.exe"
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1484
      • C:\Windows\SysWOW64\sc.exe
        "sc.exe" stop MasonService
        3⤵
        • Launches sc.exe
        • System Location Discovery: System Language Discovery
        PID:4112
      • C:\Windows\SysWOW64\sc.exe
        "sc.exe" delete MasonService
        3⤵
        • Launches sc.exe
        • System Location Discovery: System Language Discovery
        PID:4968
      • C:\Windows\SysWOW64\sc.exe
        "sc.exe" create MasonService binPath= "C:\Windows\System32\MasonService.exe /service" type= own start= auto
        3⤵
        • Launches sc.exe
        • System Location Discovery: System Language Discovery
        PID:5664
      • C:\Windows\SysWOW64\sc.exe
        "sc.exe" description MasonService "Mason Stable Service (Single Instance)"
        3⤵
        • Launches sc.exe
        • System Location Discovery: System Language Discovery
        PID:2968
      • C:\Windows\SysWOW64\sc.exe
        "sc.exe" failure MasonService reset= 3600 actions= restart/10000
        3⤵
        • Launches sc.exe
        • System Location Discovery: System Language Discovery
        PID:5408
      • C:\Windows\SysWOW64\sc.exe
        "sc.exe" start MasonService
        3⤵
        • Launches sc.exe
        • System Location Discovery: System Language Discovery
        PID:5164
  • C:\Windows\SysWOW64\MasonService.exe
    C:\Windows\SysWOW64\MasonService.exe /service
    1⤵
    • Executes dropped EXE
    • Drops file in Windows directory
    • System Location Discovery: System Language Discovery
    • Modifies data under HKEY_USERS
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5492
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3648
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:5900
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3016
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic" path win32_VideoController get name
      2⤵
      • System Location Discovery: System Language Discovery
      • Detects videocard installed
      • Suspicious behavior: EnumeratesProcesses
      PID:5660
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      PID:4840
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      PID:2420
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      PID:5568
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic" path win32_VideoController get name
      2⤵
      • System Location Discovery: System Language Discovery
      • Detects videocard installed
      • Suspicious behavior: EnumeratesProcesses
      PID:5812
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      PID:1520
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      PID:4392
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      PID:5364
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic" path win32_VideoController get name
      2⤵
      • System Location Discovery: System Language Discovery
      • Detects videocard installed
      • Suspicious behavior: EnumeratesProcesses
      PID:2900
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      PID:1688
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      PID:5600
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      PID:4452
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic" path win32_VideoController get name
      2⤵
      • System Location Discovery: System Language Discovery
      • Detects videocard installed
      • Suspicious behavior: EnumeratesProcesses
      PID:3488
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5624
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
      • System Location Discovery: System Language Discovery
      PID:476
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3792
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic" path win32_VideoController get name
      2⤵
      • System Location Discovery: System Language Discovery
      • Detects videocard installed
      PID:4980
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • System Location Discovery: System Language Discovery
      PID:6020
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5404
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2380
    • C:\Windows\SysWOW64\Wbem\wmic.exe
      "wmic" path win32_VideoController get name
      2⤵
      • System Location Discovery: System Language Discovery
      • Detects videocard installed
      PID:6000

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        MasonService.exe

        • Path C:\Windows\SysWOW64\MasonService.exe
        • Size 2.6MB
        • SHA256 9f7bf14ba4ebd047fe0382abd5d411575f137327faf6aa022f4fa3128291537a
        • MD5 SHA1 SHA512 SSDEEP TLSH

        rgTR28a3YFsfCKV.ligma

        • Path C:\Windows\SystemTemp\rgTR28a3YFsfCKV.ligma
        • Size 22B
        • SHA256 8739c76e681f900923b900c9df0ef75cf421d39cabb54650c4b9ad19b6a76d85
        • MD5 SHA1 SHA512

        memory/1484-5-0x00000000751E0000-0x000000007599C000-memory.dmp

        memory/1484-9-0x00000000751E0000-0x000000007599C000-memory.dmp

        memory/1484-6-0x00000000751E0000-0x000000007599C000-memory.dmp

        memory/2448-4-0x00000000751E0000-0x000000007599C000-memory.dmp

        memory/2448-0-0x00000000751F2000-0x00000000751F3000-memory.dmp

        memory/2448-2-0x00000000751E0000-0x000000007599C000-memory.dmp

        memory/2448-1-0x0000000000FE0000-0x000000000127C000-memory.dmp

        memory/5492-8-0x00000000045B0000-0x00000000045D2000-memory.dmp

        memory/5492-10-0x0000000004E10000-0x0000000004E52000-memory.dmp

        memory/5492-12-0x0000000005140000-0x00000000051D2000-memory.dmp

        memory/5492-11-0x0000000005060000-0x00000000050A0000-memory.dmp

        memory/5492-13-0x0000000006DD0000-0x000000000738A000-memory.dmp

        memory/5492-14-0x00000000068D0000-0x00000000068DA000-memory.dmp

        memory/5492-15-0x0000000006900000-0x0000000006912000-memory.dmp

        memory/5492-17-0x0000000006B00000-0x0000000006B76000-memory.dmp

        memory/5492-21-0x0000000006DA0000-0x0000000006DBE000-memory.dmp