Analysis

  • max time kernel
    135s
  • max time network
    104s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/05/2024, 17:11

General

  • Target
    170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc72.exe
  • Size 2.0MB
  • Sample240526-vqb42aed82
  • SHA256 170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc72
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • DcRat 30 IoCs

    DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

  • Modifies WinLogon for persistence 2 TTPs 10 IoCs
  • Process spawned unexpected child process 30 IoCs

    This typically indicates the parent process was compromised via an exploit or macro.

  • DCRat payload 3 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 20 IoCs
  • Drops file in Program Files directory 5 IoCs
  • Drops file in Windows directory 21 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 30 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc72.exe
    "C:\Users\Admin\AppData\Local\Temp\170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc72.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Checks computer location settings
    • Adds Run key to start application
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2724
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\CM21Qg9nNg.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3976
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:3188
        • C:\Users\Default User\dllhost.exe
          "C:\Users\Default User\dllhost.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:4456
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc721" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc72.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1420
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc72" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc72.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4372
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc721" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc72.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3584
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Setup Files\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\winlogon.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3724
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Setup Files\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2868
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Setup Files\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1920
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\StartMenuExperienceHost.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4656
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\StartMenuExperienceHost.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:5012
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\StartMenuExperienceHost.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2268
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\Windows\assembly\NativeImages_v2.0.50727_64\Microsoft.PowerShel#\RuntimeBroker.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3460
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\assembly\NativeImages_v2.0.50727_64\Microsoft.PowerShel#\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2504
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Windows\assembly\NativeImages_v2.0.50727_64\Microsoft.PowerShel#\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3712
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 10 /tr "'C:\Windows\uk-UA\System.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1164
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Windows\uk-UA\System.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2896
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 10 /tr "'C:\Windows\uk-UA\System.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3536
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc721" /sc MINUTE /mo 9 /tr "'C:\Windows\Offline Web Pages\170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc72.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4584
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc72" /sc ONLOGON /tr "'C:\Windows\Offline Web Pages\170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc72.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2088
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc721" /sc MINUTE /mo 12 /tr "'C:\Windows\Offline Web Pages\170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc72.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:608
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\wininit.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4008
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\wininit.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3192
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 13 /tr "'C:\Recovery\WindowsRE\wininit.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4868
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 10 /tr "'C:\Windows\L2Schemas\SppExtComObj.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:996
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Windows\L2Schemas\SppExtComObj.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1476
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 7 /tr "'C:\Windows\L2Schemas\SppExtComObj.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2076
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2992
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1760
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 8 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:5036
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 10 /tr "'C:\Users\Default User\dllhost.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4036
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Users\Default User\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:968
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 5 /tr "'C:\Users\Default User\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3288

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          wininit.exe

          • Path C:\Recovery\WindowsRE\wininit.exe
          • Size 2.0MB
          • SHA256 1c8c5804ecf2fd58eecaa5980a83dd72144a811514c88e9088d489957722bbd5
          • MD5 SHA1 SHA512 SSDEEP

          CM21Qg9nNg.bat

          • Path C:\Users\Admin\AppData\Local\Temp\CM21Qg9nNg.bat
          • Size 198B
          • SHA256 0cd39e17e5bea52ee57748ff48a3505eb5cdde7447c52314372b44c7299cf3b1
          • MD5 SHA1 SHA512

          System.exe

          • Path C:\Windows\uk-UA\System.exe
          • Size 2.0MB
          • SHA256 170584ecdd7e1e945137980f722d2d68e7abc00b3534fe0c823d7ffcdf9afc72
          • MD5 SHA1 SHA512 SSDEEP

          memory/2724-6-0x000000001BB80000-0x000000001BB90000-memory.dmp

          memory/2724-12-0x000000001C290000-0x000000001C29E000-memory.dmp

          memory/2724-0-0x0000000000E40000-0x000000000104C000-memory.dmp

          memory/2724-5-0x000000001BB70000-0x000000001BB78000-memory.dmp

          memory/2724-7-0x000000001BB90000-0x000000001BBA6000-memory.dmp

          memory/2724-8-0x000000001BC10000-0x000000001BC66000-memory.dmp

          memory/2724-9-0x000000001BBB0000-0x000000001BBBC000-memory.dmp

          memory/2724-10-0x000000001C270000-0x000000001C27C000-memory.dmp

          memory/2724-11-0x000000001C280000-0x000000001C28C000-memory.dmp

          memory/2724-4-0x000000001BBC0000-0x000000001BC10000-memory.dmp

          memory/2724-13-0x000000001C2A0000-0x000000001C2AE000-memory.dmp

          memory/2724-14-0x000000001C2B0000-0x000000001C2BA000-memory.dmp

          memory/2724-3-0x0000000003170000-0x000000000318C000-memory.dmp

          memory/2724-2-0x00007FF8B17D0000-0x00007FF8B2291000-memory.dmp

          memory/2724-162-0x00007FF8B17D0000-0x00007FF8B2291000-memory.dmp

          memory/2724-1-0x00007FF8B17D3000-0x00007FF8B17D5000-memory.dmp

          memory/4456-167-0x000000001BCC0000-0x000000001BD16000-memory.dmp