Analysis

  • max time kernel
    93s
  • max time network
    94s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-01-2025 13:22

General

  • Target

    0243e305392e0655c274aae35aa30df5dcbd79c245247fc9da69a8293d3d60a2N.exe

  • Size

    783KB

  • MD5

    f1d938f2dc6463685579c83225764940

  • SHA1

    ddce230b2c30d324736280ec8f3bc2679f0bce11

  • SHA256

    0243e305392e0655c274aae35aa30df5dcbd79c245247fc9da69a8293d3d60a2

  • SHA512

    8ab6c2fa9672bd2aef8dd1a976ab71043c27f72d76e21ca7a2813ac832383f486decffe332920df5197957021efc21df6706333e11912df3ad81cab8a9d6b792

  • SSDEEP

    12288:GqnOYxdAgpoNeF91rg5iFdr0yQ9gYx+EIpakCYJRU7Q9bWoFzqK:G+OQbpbgsFdAyQvzSqaq8q

Malware Config

Signatures

  • DcRat

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

  • Dcrat family
  • Process spawned unexpected child process 6 IoCs

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

  • UAC bypass 3 TTPs 6 IoCs
  • 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 6 IoCs
  • Checks whether UAC is enabled 1 TTPs 4 IoCs
  • Drops file in System32 directory 4 IoCs
  • Drops file in Program Files directory 4 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 6 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs
  • System policy modification 1 TTPs 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\0243e305392e0655c274aae35aa30df5dcbd79c245247fc9da69a8293d3d60a2N.exe
    "C:\Users\Admin\AppData\Local\Temp\0243e305392e0655c274aae35aa30df5dcbd79c245247fc9da69a8293d3d60a2N.exe"
    1⤵
    • UAC bypass
    • Checks computer location settings
    • Adds Run key to start application
    • Checks whether UAC is enabled
    • Drops file in System32 directory
    • 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
    • System policy modification
    PID:3132
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\upQz82zIPb.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1448
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:2648
        • C:\PerfLogs\RuntimeBroker.exe
          "C:\PerfLogs\RuntimeBroker.exe"
          3⤵
          • UAC bypass
          • Executes dropped EXE
          • Checks whether UAC is enabled
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • System policy modification
          PID:1596
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\PerfLogs\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4276
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\InputApp\InputApp\TextInputHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2948
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\OfficeClickToRun.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1532
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\PerfLogs\wininit.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3500
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\Common Files\microsoft shared\ClickToRun\AppVManifest\OfficeClickToRun.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3432
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Windows\System32\wbem\NetPeerDistCim\unsecapp.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:908

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Program Files\Common Files\microsoft shared\ClickToRun\AppVManifest\OfficeClickToRun.exe

      Filesize

      783KB

      MD5

      f1d938f2dc6463685579c83225764940

      SHA1

      ddce230b2c30d324736280ec8f3bc2679f0bce11

      SHA256

      0243e305392e0655c274aae35aa30df5dcbd79c245247fc9da69a8293d3d60a2

      SHA512

      8ab6c2fa9672bd2aef8dd1a976ab71043c27f72d76e21ca7a2813ac832383f486decffe332920df5197957021efc21df6706333e11912df3ad81cab8a9d6b792

    • C:\Users\Admin\AppData\Local\Temp\upQz82zIPb.bat

      Filesize

      193B

      MD5

      2176e6838e3dac4f4af96339968b0b65

      SHA1

      fd57371233fbbded1b042a2d1d503024873395ce

      SHA256

      fe742905ed9096e780ec1ae229c48d3eff58bd65739340fd8806e9ba327b076b

      SHA512

      415cdd9dcd99f7ed145c867ff811d6a8298df256c12d69b357bf499e6326cd3336ef58be47050c8a55d45f6790ffc07dd2cc750e22f5c716aa62a234d841e8c5

    • C:\Windows\System32\wbem\NetPeerDistCim\unsecapp.exe

      Filesize

      783KB

      MD5

      420a227a688743031f9880c1d767fa86

      SHA1

      f4802f0ee27b84f0f4f2d5b11885e81ca5a6b8b4

      SHA256

      19fde28df57b800bf24052674e43f780b3eaa7a901d5cce2f59fd89d0b621ae1

      SHA512

      760869e902daadc8df55612f0908f51dc81dd3200bcbe5bc9a11b52a2c91e6f783812f0d0f01d062a04f9385f799d568e7ef4170c6651a50cd2c3be61f75eee5

    • memory/3132-14-0x000000001AFA0000-0x000000001AFA8000-memory.dmp

      Filesize

      32KB

    • memory/3132-15-0x000000001AFC0000-0x000000001AFC8000-memory.dmp

      Filesize

      32KB

    • memory/3132-6-0x0000000000D90000-0x0000000000D98000-memory.dmp

      Filesize

      32KB

    • memory/3132-7-0x0000000002660000-0x000000000266C000-memory.dmp

      Filesize

      48KB

    • memory/3132-8-0x0000000002680000-0x000000000268A000-memory.dmp

      Filesize

      40KB

    • memory/3132-10-0x00000000026A0000-0x00000000026A8000-memory.dmp

      Filesize

      32KB

    • memory/3132-5-0x0000000000D80000-0x0000000000D90000-memory.dmp

      Filesize

      64KB

    • memory/3132-9-0x0000000002670000-0x000000000267A000-memory.dmp

      Filesize

      40KB

    • memory/3132-11-0x000000001AFB0000-0x000000001AFB8000-memory.dmp

      Filesize

      32KB

    • memory/3132-12-0x0000000002690000-0x0000000002698000-memory.dmp

      Filesize

      32KB

    • memory/3132-13-0x000000001AF90000-0x000000001AF98000-memory.dmp

      Filesize

      32KB

    • memory/3132-0-0x00007FFDDEDD3000-0x00007FFDDEDD5000-memory.dmp

      Filesize

      8KB

    • memory/3132-16-0x000000001AFD0000-0x000000001AFD8000-memory.dmp

      Filesize

      32KB

    • memory/3132-4-0x0000000000D70000-0x0000000000D78000-memory.dmp

      Filesize

      32KB

    • memory/3132-17-0x000000001AFE0000-0x000000001AFE8000-memory.dmp

      Filesize

      32KB

    • memory/3132-18-0x000000001AFF0000-0x000000001AFF8000-memory.dmp

      Filesize

      32KB

    • memory/3132-23-0x000000001B080000-0x000000001B088000-memory.dmp

      Filesize

      32KB

    • memory/3132-21-0x00007FFDDEDD0000-0x00007FFDDF891000-memory.dmp

      Filesize

      10.8MB

    • memory/3132-20-0x000000001B060000-0x000000001B068000-memory.dmp

      Filesize

      32KB

    • memory/3132-19-0x000000001B050000-0x000000001B058000-memory.dmp

      Filesize

      32KB

    • memory/3132-22-0x000000001B070000-0x000000001B07C000-memory.dmp

      Filesize

      48KB

    • memory/3132-26-0x00007FFDDEDD0000-0x00007FFDDF891000-memory.dmp

      Filesize

      10.8MB

    • memory/3132-33-0x00007FFDDEDD0000-0x00007FFDDF891000-memory.dmp

      Filesize

      10.8MB

    • memory/3132-3-0x0000000000D60000-0x0000000000D68000-memory.dmp

      Filesize

      32KB

    • memory/3132-2-0x00007FFDDEDD0000-0x00007FFDDF891000-memory.dmp

      Filesize

      10.8MB

    • memory/3132-1-0x0000000000400000-0x00000000004CA000-memory.dmp

      Filesize

      808KB

    • memory/3132-84-0x00007FFDDEDD0000-0x00007FFDDF891000-memory.dmp

      Filesize

      10.8MB