Analysis

  • max time kernel
    136s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-07-2024 02:56

General

  • Target

    cdb363f810ebeea6e40abc725c14e9bf78a3014559ec3.exe

  • Size

    3.3MB

  • MD5

    af4cd8f5b99d7e371a6ddd880aec1079

  • SHA1

    caba9083a0128266b477330c2e5d8874646a915d

  • SHA256

    cdb363f810ebeea6e40abc725c14e9bf78a3014559ec32903c15fd7576fcac20

  • SHA512

    c0fbb42b516c4a83a3dbeab47199fb603330929788008a314c222ec1585845a40538cd2f2b18ace200436beeed2b7428fe23fd9e19bb2f5a3f48939ab93432ff

  • SSDEEP

    98304:PbD91o0GWLMJo5sZB8MDJ2RZeeD+Gvl/ndA:PXbnGWLMTZyjnCg/i

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 4 IoCs
  • Process spawned unexpected child process 12 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.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 5 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Adds Run key to start application 2 TTPs 8 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 12 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 18 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of WriteProcessMemory 23 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\cdb363f810ebeea6e40abc725c14e9bf78a3014559ec3.exe
    "C:\Users\Admin\AppData\Local\Temp\cdb363f810ebeea6e40abc725c14e9bf78a3014559ec3.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:3424
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Surrogatewebref\0OThNUtq.vbe"
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:3108
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Surrogatewebref\W7CNC.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4036
        • C:\Surrogatewebref\reviewcommon.exe
          "C:\Surrogatewebref\reviewcommon.exe"
          4⤵
          • Modifies WinLogon for persistence
          • Checks computer location settings
          • Executes dropped EXE
          • Adds Run key to start application
          • Drops file in Windows directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1676
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Surrogatewebref\reviewcommon.exe'
            5⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:3636
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Surrogatewebref\System.exe'
            5⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:540
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\3D Objects\fontdrvhost.exe'
            5⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2176
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\Resources\Themes\aero\en-US\sihost.exe'
            5⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:4772
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\Vss\Writers\System\services.exe'
            5⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:3040
          • C:\Users\Admin\3D Objects\fontdrvhost.exe
            "C:\Users\Admin\3D Objects\fontdrvhost.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2912
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Surrogatewebref\file.vbs"
      2⤵
        PID:1104
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 13 /tr "'C:\Surrogatewebref\System.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1492
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Surrogatewebref\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3892
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 13 /tr "'C:\Surrogatewebref\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4388
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 14 /tr "'C:\Users\Admin\3D Objects\fontdrvhost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4444
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Users\Admin\3D Objects\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2496
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 5 /tr "'C:\Users\Admin\3D Objects\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5104
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 7 /tr "'C:\Windows\Resources\Themes\aero\en-US\sihost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:676
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Windows\Resources\Themes\aero\en-US\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4164
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 7 /tr "'C:\Windows\Resources\Themes\aero\en-US\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4436
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 14 /tr "'C:\Windows\Vss\Writers\System\services.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4840
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\Vss\Writers\System\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1504
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 13 /tr "'C:\Windows\Vss\Writers\System\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4764

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Surrogatewebref\0OThNUtq.vbe

      Filesize

      197B

      MD5

      013e4068fecbf70a6305a10f4baac7d0

      SHA1

      113ac6511cb6965dc872d284552ea129e1e41973

      SHA256

      f087215bae0916b3575743a62c0d6722e6e78623f8046a53f8914661b3c6a10e

      SHA512

      f50fb4b24aa8846c94fba07e07b0f5e71b7c67b9843c34951eb4b4fbb7de8309d1441c16359621402659b3c4a406dccc93ea79056030f63adf8a359934cd3940

    • C:\Surrogatewebref\W7CNC.bat

      Filesize

      37B

      MD5

      b0d15fb085639d7d63a9556af4bdfced

      SHA1

      8a5498b0d47fbeae2c9452ceb8f413f4b1d3ac0b

      SHA256

      2e7b9e10897a9224a935716fbefe4c362d8a09ef9176a8ed794741e7418521b5

      SHA512

      d88ab6f23c8e08dd82443239451b84de849a967d08d20b84894e8cf134ad2789c2e9c9e92d6d1c3da0b9e3e0bcecd4a86d5b24fe167f4f6f8a3a5ad8f5b0e146

    • C:\Surrogatewebref\file.vbs

      Filesize

      34B

      MD5

      677cc4360477c72cb0ce00406a949c61

      SHA1

      b679e8c3427f6c5fc47c8ac46cd0e56c9424de05

      SHA256

      f1cccb5ae4aa51d293bd3c7d2a1a04cb7847d22c5db8e05ac64e9a6d7455aa0b

      SHA512

      7cfe2cc92f9e659f0a15a295624d611b3363bd01eb5bcf9bc7681ea9b70b0564d192d570d294657c8dc2c93497fa3b4526c975a9bf35d69617c31d9936573c6a

    • C:\Surrogatewebref\reviewcommon.exe

      Filesize

      3.0MB

      MD5

      2691a48220ece165313a2096d4be7788

      SHA1

      bb9d65345c7aae09cd340e8b2eae8e3a8ff45f96

      SHA256

      20a6875053a9b02e3dca4c650b698f5eb0f22119b6d51317043c5953aab00a55

      SHA512

      13c70c3a44aa67a29e066d6c7e283574d165fa2a1e6bfc4be992ff6fcfc9c1a126b97fd64f18dfbe4e5d27eae75e8b6e6325f3ae96871afb2aef006e6589023f

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

      Filesize

      2KB

      MD5

      d85ba6ff808d9e5444a4b369f5bc2730

      SHA1

      31aa9d96590fff6981b315e0b391b575e4c0804a

      SHA256

      84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

      SHA512

      8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      944B

      MD5

      d28a889fd956d5cb3accfbaf1143eb6f

      SHA1

      157ba54b365341f8ff06707d996b3635da8446f7

      SHA256

      21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45

      SHA512

      0b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      944B

      MD5

      3a6bad9528f8e23fb5c77fbd81fa28e8

      SHA1

      f127317c3bc6407f536c0f0600dcbcf1aabfba36

      SHA256

      986366767de5873f1b170a63f2a33ce05132d1afd90c8f5017afbca8ef1beb05

      SHA512

      846002154a0ece6f3e9feda6f115d3161dc21b3789525dd62ae1d9188495171293efdbe7be4710666dd8a15e66b557315b5a02918a741ed1d5f3ff0c515b98e2

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      944B

      MD5

      6d42b6da621e8df5674e26b799c8e2aa

      SHA1

      ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

      SHA256

      5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

      SHA512

      53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

    • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_navmwc30.jew.ps1

      Filesize

      60B

      MD5

      d17fe0a3f47be24a6453e9ef58c94641

      SHA1

      6ab83620379fc69f80c0242105ddffd7d98d5d9d

      SHA256

      96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

      SHA512

      5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

    • memory/1676-29-0x000000001BE40000-0x000000001BE4C000-memory.dmp

      Filesize

      48KB

    • memory/1676-33-0x000000001CD90000-0x000000001D2B8000-memory.dmp

      Filesize

      5.2MB

    • memory/1676-24-0x0000000003590000-0x00000000035A2000-memory.dmp

      Filesize

      72KB

    • memory/1676-25-0x00000000035A0000-0x00000000035AC000-memory.dmp

      Filesize

      48KB

    • memory/1676-26-0x00000000035B0000-0x00000000035C0000-memory.dmp

      Filesize

      64KB

    • memory/1676-27-0x00000000035C0000-0x00000000035CC000-memory.dmp

      Filesize

      48KB

    • memory/1676-28-0x000000001BDF0000-0x000000001BE46000-memory.dmp

      Filesize

      344KB

    • memory/1676-22-0x000000001BDA0000-0x000000001BDF0000-memory.dmp

      Filesize

      320KB

    • memory/1676-30-0x000000001C810000-0x000000001C81C000-memory.dmp

      Filesize

      48KB

    • memory/1676-31-0x000000001C820000-0x000000001C828000-memory.dmp

      Filesize

      32KB

    • memory/1676-32-0x000000001C830000-0x000000001C842000-memory.dmp

      Filesize

      72KB

    • memory/1676-23-0x0000000003570000-0x0000000003586000-memory.dmp

      Filesize

      88KB

    • memory/1676-34-0x000000001C860000-0x000000001C86C000-memory.dmp

      Filesize

      48KB

    • memory/1676-35-0x000000001C870000-0x000000001C878000-memory.dmp

      Filesize

      32KB

    • memory/1676-36-0x000000001C980000-0x000000001C98C000-memory.dmp

      Filesize

      48KB

    • memory/1676-37-0x000000001C880000-0x000000001C88E000-memory.dmp

      Filesize

      56KB

    • memory/1676-38-0x000000001C890000-0x000000001C89E000-memory.dmp

      Filesize

      56KB

    • memory/1676-39-0x000000001C8A0000-0x000000001C8A8000-memory.dmp

      Filesize

      32KB

    • memory/1676-17-0x0000000000EE0000-0x00000000011EA000-memory.dmp

      Filesize

      3.0MB

    • memory/1676-21-0x0000000003550000-0x000000000356C000-memory.dmp

      Filesize

      112KB

    • memory/1676-20-0x0000000003540000-0x0000000003548000-memory.dmp

      Filesize

      32KB

    • memory/1676-19-0x0000000003410000-0x000000000341E000-memory.dmp

      Filesize

      56KB

    • memory/1676-18-0x0000000003400000-0x000000000340E000-memory.dmp

      Filesize

      56KB

    • memory/2176-64-0x000001B3C93E0000-0x000001B3C9402000-memory.dmp

      Filesize

      136KB