Analysis

  • max time kernel
    137s
  • max time network
    105s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20-07-2024 21:31

General

  • Target

    AC9E1C7DECB45FA41C77E30543BC535E.exe

  • Size

    827KB

  • MD5

    ac9e1c7decb45fa41c77e30543bc535e

  • SHA1

    b89c25859b9b195d8768868be6d4b029bd395d1f

  • SHA256

    fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682

  • SHA512

    32ad2b8385fbb5206be47bd55f8a3af55ce6fd84c48771fec8b7fc39862fb9133aaf99de5672a548454c17fd05a03a0f3c1813df65b65fdae73ca7881393c417

  • SSDEEP

    12288:aRX/Vbdw0amUjO3t/6jf0eEHP2a1KP/CpvwfpKdXRJNJa:kXVamd96jf0/2apvwxKdXRJNJa

Malware Config

Signatures

  • DcRat

    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 2 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 9 IoCs
  • Drops file in Windows directory 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 30 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 10 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\AC9E1C7DECB45FA41C77E30543BC535E.exe
    "C:\Users\Admin\AppData\Local\Temp\AC9E1C7DECB45FA41C77E30543BC535E.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:468
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\q0XCbRBZ91.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4492
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:64
        • C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\RuntimeBroker.exe
          "C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\RuntimeBroker.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:1264
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\RuntimeBroker.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4504
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4528
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:680
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\Idle.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2280
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\Idle.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2096
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\Idle.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1536
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorere" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Esl\explorer.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2980
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Esl\explorer.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1784
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorere" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Esl\explorer.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1748
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\StartMenuExperienceHost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:216
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\StartMenuExperienceHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4300
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\StartMenuExperienceHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:208
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 8 /tr "'C:\Program Files\Google\Chrome\Application\SetupMetrics\sihost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2984
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Program Files\Google\Chrome\Application\SetupMetrics\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3664
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 10 /tr "'C:\Program Files\Google\Chrome\Application\SetupMetrics\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:244
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 12 /tr "'C:\Program Files\Windows NT\TableTextService\sysmon.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:396
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Program Files\Windows NT\TableTextService\sysmon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4500
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows NT\TableTextService\sysmon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4272
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 7 /tr "'C:\Windows\Offline Web Pages\csrss.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:872
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\Offline Web Pages\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:380
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\Windows\Offline Web Pages\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4000
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "MusNotificationM" /sc MINUTE /mo 5 /tr "'C:\Program Files\MSBuild\MusNotification.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2364
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "MusNotification" /sc ONLOGON /tr "'C:\Program Files\MSBuild\MusNotification.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4620
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "MusNotificationM" /sc MINUTE /mo 12 /tr "'C:\Program Files\MSBuild\MusNotification.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1036
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "AC9E1C7DECB45FA41C77E30543BC535EA" /sc MINUTE /mo 8 /tr "'C:\Windows\en-US\AC9E1C7DECB45FA41C77E30543BC535E.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1908
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "AC9E1C7DECB45FA41C77E30543BC535E" /sc ONLOGON /tr "'C:\Windows\en-US\AC9E1C7DECB45FA41C77E30543BC535E.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4480
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "AC9E1C7DECB45FA41C77E30543BC535EA" /sc MINUTE /mo 6 /tr "'C:\Windows\en-US\AC9E1C7DECB45FA41C77E30543BC535E.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:512
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\Registry.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1420
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\Registry.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:372
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\Registry.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3744

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Program Files\Google\Chrome\Application\SetupMetrics\sihost.exe

      Filesize

      827KB

      MD5

      ac9e1c7decb45fa41c77e30543bc535e

      SHA1

      b89c25859b9b195d8768868be6d4b029bd395d1f

      SHA256

      fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682

      SHA512

      32ad2b8385fbb5206be47bd55f8a3af55ce6fd84c48771fec8b7fc39862fb9133aaf99de5672a548454c17fd05a03a0f3c1813df65b65fdae73ca7881393c417

    • C:\Users\Admin\AppData\Local\Temp\q0XCbRBZ91.bat

      Filesize

      245B

      MD5

      778d3d4aeaf201a4e0ff78fbb9efc39d

      SHA1

      1654a53e2f2811c8e5e20e1a50eace7fcbaa9c7e

      SHA256

      554e1fb94154f34930cf0cbe8464bb6e47c0ccb0b1cefe0988618741a581c9a0

      SHA512

      900b5d0cd657f2d30e66ccd8899c2d6bee86329002cfbd5530befa7ef6a71c324f3d9bab9b2d533473cf5abef4f073c836f356ca7e7b661d9f36a3d645ee719e

    • memory/468-0-0x00007FFAECF53000-0x00007FFAECF55000-memory.dmp

      Filesize

      8KB

    • memory/468-1-0x0000000000FF0000-0x00000000010C6000-memory.dmp

      Filesize

      856KB

    • memory/468-4-0x00007FFAECF50000-0x00007FFAEDA11000-memory.dmp

      Filesize

      10.8MB

    • memory/468-28-0x00007FFAECF50000-0x00007FFAEDA11000-memory.dmp

      Filesize

      10.8MB