Analysis

  • max time kernel
    147s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25/03/2024, 02:12

General

  • Target

    6efee44acf580c370d19926398438acb40a8c63120bad4e2502d8a847e011239.exe

  • Size

    1.7MB

  • MD5

    1cf1c8a6b74890f6d1913bf3b9e46a79

  • SHA1

    3baa803148359d5ecd3afac11352e8ecab90ceee

  • SHA256

    6efee44acf580c370d19926398438acb40a8c63120bad4e2502d8a847e011239

  • SHA512

    6903889c69d4b6c13c768592abff2aa20b3f8c689381d4814f27c4647023bcfdbd20e99d98913e1d8ec19751d2eb1dbc5a8ca3e0a48be3acdcbd9a644ea5cc70

  • SSDEEP

    24576:J2G/nvxW3WAAJElP9nCWgiFzoJNkvnw28BAc1eThSQFdO5q+4OvqLqzvXrJhtZ:JbA3Qa4h527ceSQFdOo+HqLqHfP

Score
10/10

Malware Config

Signatures

  • DcRat

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

  • 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.

  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Drops file in Program Files directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 12 IoCs

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

  • Modifies registry class 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 14 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\6efee44acf580c370d19926398438acb40a8c63120bad4e2502d8a847e011239.exe
    "C:\Users\Admin\AppData\Local\Temp\6efee44acf580c370d19926398438acb40a8c63120bad4e2502d8a847e011239.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:1000
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\BlockSurrogateagentFont\fQyg6J4g9nmbhwQ5lS61NpcW4.vbe"
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:1776
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\BlockSurrogateagentFont\xRLfwMVgfRAMuw596iKz87.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2012
        • C:\BlockSurrogateagentFont\hostnet.exe
          "C:\BlockSurrogateagentFont\hostnet.exe"
          4⤵
          • Checks computer location settings
          • Executes dropped EXE
          • Drops file in Program Files directory
          • Modifies registry class
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:748
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\y05nXIVCAi.bat"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:952
            • C:\Windows\system32\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              6⤵
                PID:4700
              • C:\BlockSurrogateagentFont\RuntimeBroker.exe
                "C:\BlockSurrogateagentFont\RuntimeBroker.exe"
                6⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:2596
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\cmd.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4940
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\cmd.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2024
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\cmd.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4512
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Microsoft.NET\RedistList\sppsvc.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:5000
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft.NET\RedistList\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3068
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Microsoft.NET\RedistList\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1472
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\BlockSurrogateagentFont\RuntimeBroker.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1108
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\BlockSurrogateagentFont\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1560
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\BlockSurrogateagentFont\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1688
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 12 /tr "'C:\Users\All Users\Microsoft\DeviceSync\sihost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3408
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Users\All Users\Microsoft\DeviceSync\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2792
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 11 /tr "'C:\Users\All Users\Microsoft\DeviceSync\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3792

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\BlockSurrogateagentFont\fQyg6J4g9nmbhwQ5lS61NpcW4.vbe

            Filesize

            223B

            MD5

            277c7ccc3313d83f51d594cba0ae300d

            SHA1

            48531a959a24846841b8fda471c5fea259f2ca38

            SHA256

            175078a008fd8a809b77f11c51933d1a9e5181282523819875e7afea24c52b96

            SHA512

            311e654150ad8bf4bf9b38a7b876f205cf5a450be4b6a9ced8a7e3e15ca1137a4f1dbfac0dce058031a616b4621ec592592db17e10f1753f739f710b1f54c5ac

          • C:\BlockSurrogateagentFont\hostnet.exe

            Filesize

            1.5MB

            MD5

            53827648303c620a8fa81a2998ae5ae5

            SHA1

            8aa7c650f061e7d7f396718e6b4d8934392b60bb

            SHA256

            b1f886a9cc761bbe9e6bb5287d414d3ba0e1402c6d1c055435985e3bcacbf652

            SHA512

            273bb61dbde98abc172e9afe83f25e1d2b93d0dcb9a5dd8ebef03f70c677499c4d3c1788a9fa9e71131847ba1a2e6d4ffcdac20c3496b472377756f112d1550d

          • C:\BlockSurrogateagentFont\xRLfwMVgfRAMuw596iKz87.bat

            Filesize

            40B

            MD5

            15611ce0ff6e3e772e3a8b7ac6cf4653

            SHA1

            75bc873877b06c9413cc8d1908106ed143cd4bf0

            SHA256

            630c1433757569b9e123313255a23d50e82a629396121ff21df67a56ebf92ae3

            SHA512

            1151ee66357bdb4946f534cfe5a509497ccc57668fb874d17977740db6a6796fbdd6893e3196c3dab0be44f9f1b4f1c0f8870593a960a384f978bd5a1813fe71

          • C:\Users\Admin\AppData\Local\Temp\y05nXIVCAi.bat

            Filesize

            209B

            MD5

            2417f4df9c111291240f0f565b0a2051

            SHA1

            78daf7252bd731c6d7e7d0bd1a930b8f82d64d6a

            SHA256

            1d53031193abc462fa9141a906577ef7040d5f73d1cda7b94d9200d6e50fa2dd

            SHA512

            e3293a6e12468c4b83b2b3ce91fc3fe7ba428f3744f69a5c1824f75a7e95931cdf978c60ebaed7b495cc5a41dfbd08ae08250694f3fd912faded341f46821574

          • memory/748-18-0x000000001B9C0000-0x000000001B9D6000-memory.dmp

            Filesize

            88KB

          • memory/748-20-0x000000001B9E0000-0x000000001B9F2000-memory.dmp

            Filesize

            72KB

          • memory/748-15-0x0000000002EE0000-0x0000000002EEE000-memory.dmp

            Filesize

            56KB

          • memory/748-16-0x0000000002F70000-0x0000000002F8C000-memory.dmp

            Filesize

            112KB

          • memory/748-13-0x00007FFAC4700000-0x00007FFAC51C1000-memory.dmp

            Filesize

            10.8MB

          • memory/748-17-0x000000001C040000-0x000000001C090000-memory.dmp

            Filesize

            320KB

          • memory/748-19-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/748-14-0x000000001BA30000-0x000000001BA40000-memory.dmp

            Filesize

            64KB

          • memory/748-21-0x000000001C7B0000-0x000000001CCD8000-memory.dmp

            Filesize

            5.2MB

          • memory/748-22-0x000000001B980000-0x000000001B98E000-memory.dmp

            Filesize

            56KB

          • memory/748-23-0x000000001B990000-0x000000001B99C000-memory.dmp

            Filesize

            48KB

          • memory/748-12-0x0000000000CE0000-0x0000000000E62000-memory.dmp

            Filesize

            1.5MB

          • memory/748-38-0x00007FFAC4700000-0x00007FFAC51C1000-memory.dmp

            Filesize

            10.8MB

          • memory/2596-42-0x00007FFAC4700000-0x00007FFAC51C1000-memory.dmp

            Filesize

            10.8MB

          • memory/2596-44-0x00007FFAC4700000-0x00007FFAC51C1000-memory.dmp

            Filesize

            10.8MB