Analysis

  • max time kernel
    125s
  • max time network
    148s
  • platform
    windows7_x64
  • resource
    win7-20240704-en
  • resource tags

    arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
  • submitted
    21-07-2024 10:36

General

  • Target

    DCRatBuild.exe

  • Size

    1.6MB

  • MD5

    01d84e6b9068bb3e5be23ead859dad8e

  • SHA1

    4942abe76919a4eb917336dc6ab2fa446c76acae

  • SHA256

    6a0ee90b6f1dd76a6269315104c2de7a060efc8001cda6339f29096daf59b61d

  • SHA512

    d7e72c2fb6df83f54eae57a2da350f9e5e3e38d3c9fc659d3e3c275a87374b2697eb130877f0e73dd9e4f29c88122206da5ab3ee45861582429c88d588633e7b

  • SSDEEP

    24576:U2G/nvxW3Ww0thQZoR7lLU0J5/PFiTVfHkOXYsFn2NGPxSRPl2NCd:UbA30hQZoQ0HFmYsB2x

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 9 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.

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 2 IoCs
  • Drops file in Program Files directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Scheduled Task/Job: Scheduled Task 1 TTPs 9 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 21 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\DCRatBuild.exe
    "C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2680
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Bridgecrt\sZWlDJX899JKJ.vbe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2692
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c ""C:\Bridgecrt\HCQUFaJMLZKomKKlWK1JJBtaf0zX.bat" "
        3⤵
        • Loads dropped DLL
        • Suspicious use of WriteProcessMemory
        PID:2864
        • C:\Bridgecrt\RefdhcpSvc.exe
          "C:\Bridgecrt\RefdhcpSvc.exe"
          4⤵
          • Executes dropped EXE
          • Drops file in Program Files directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2848
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\zTR87A5U1o.bat"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:2336
            • C:\Windows\system32\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              6⤵
                PID:1392
              • C:\Bridgecrt\dllhost.exe
                "C:\Bridgecrt\dllhost.exe"
                6⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious behavior: GetForegroundWindowSpam
                • Suspicious use of AdjustPrivilegeToken
                PID:748
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows NT\taskhost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3004
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows NT\taskhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3008
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows NT\taskhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2636
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 10 /tr "'C:\Recovery\3c6609c2-3a8b-11ef-9675-d685e2345d05\services.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:372
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Recovery\3c6609c2-3a8b-11ef-9675-d685e2345d05\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2880
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 13 /tr "'C:\Recovery\3c6609c2-3a8b-11ef-9675-d685e2345d05\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2992
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 9 /tr "'C:\Bridgecrt\dllhost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2108
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Bridgecrt\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2132
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 12 /tr "'C:\Bridgecrt\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1964
    • C:\Windows\explorer.exe
      "C:\Windows\explorer.exe"
      1⤵
        PID:1744
      • C:\Windows\explorer.exe
        "C:\Windows\explorer.exe"
        1⤵
          PID:448

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        • C:\Bridgecrt\HCQUFaJMLZKomKKlWK1JJBtaf0zX.bat

          Filesize

          29B

          MD5

          f8f274a07f5224a3f69091f043af146c

          SHA1

          2513dccda5f12624dbb9a13052a2e629936bbab6

          SHA256

          8a6e165c22056fc26e710ade51ec3f299e8aca3c4e43b53cc77b9be60bb3cb24

          SHA512

          0c559ea5231d80976bb21b6ba1f8d788112cf89a8c7c32bb268557711a4d945f718616f9324997b5e59980956b736a1c59fb93ec17280cc7b8ccf3cf81ac298f

        • C:\Bridgecrt\RefdhcpSvc.exe

          Filesize

          1.3MB

          MD5

          a343cf9f611cf1f2ef2a2d373cbdfd2f

          SHA1

          f8ede9731b42eeeaabd25860daf7a15191a7110d

          SHA256

          c4673884aade477ec758af7be2636fac36cf2d41d5e4993968923c01c50f35ba

          SHA512

          c2a1eb1aa23444862c97a3d36761e1d88dd209ddc97d40ca48198492521d56101658603fca769262bbb8bf69b464a29c32f21993566750670d723d531a1acfb9

        • C:\Bridgecrt\sZWlDJX899JKJ.vbe

          Filesize

          214B

          MD5

          285bb3888130afca5f0d63c7a7ddb141

          SHA1

          00c513275ea59c5a70cd1918d3338e307d976e2c

          SHA256

          02eebeb58e57999fcff710e124688a73e0cbd54fbe7d1e8a8ec52c14388944f8

          SHA512

          9b2bd6b921bc0a286a6ad691b64109406e2f2a3bcd8ace294e5b095cb373bd8df463c133cb470674d9bba8db15efabfb7310aa67a93ba89aff010bbddbf5c5d2

        • C:\Users\Admin\AppData\Local\Temp\zTR87A5U1o.bat

          Filesize

          189B

          MD5

          0a14d11ea08bc41955c872c66a5a3510

          SHA1

          fcd110b3e0316a648791c2438311fb6b5b40f5a7

          SHA256

          574d721e71e775dfafbad30513d52deef9bf84a84818ce24dd37abe6cfc67217

          SHA512

          ab52a265047729217f994fe4316e97e0f329aaa132a42d18ba4e3922324b1a91cf978a82dc541b850b842956895a8dac344b3eb2282633f5a612dfddd019a84d

        • memory/748-31-0x0000000000C50000-0x0000000000D9A000-memory.dmp

          Filesize

          1.3MB

        • memory/2848-13-0x0000000000EB0000-0x0000000000FFA000-memory.dmp

          Filesize

          1.3MB

        • memory/2848-14-0x0000000000430000-0x000000000043E000-memory.dmp

          Filesize

          56KB

        • memory/2848-15-0x0000000000460000-0x000000000047C000-memory.dmp

          Filesize

          112KB

        • memory/2848-16-0x0000000000480000-0x0000000000496000-memory.dmp

          Filesize

          88KB

        • memory/2848-17-0x0000000000440000-0x0000000000450000-memory.dmp

          Filesize

          64KB