Analysis

  • max time kernel
    36s
  • max time network
    45s
  • platform
    windows7_x64
  • resource
    win7-20241010-en
  • resource tags

    arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
  • submitted
    30-10-2024 17:26

General

  • Target

    F7361ED3503F11A56E8CC53AD6C277B8.exe

  • Size

    1.2MB

  • MD5

    f7361ed3503f11a56e8cc53ad6c277b8

  • SHA1

    bfa62d30d715bf866d5a2a6198a474c316b3dc04

  • SHA256

    a64e0fad64514c66bc6750432d8c3ef96932f9902886f540cca217031d1cfc44

  • SHA512

    9828478b57e85a2341262127e3149f5a9e48523198665b99634738627f107c1f5ab0c30ad80819bd9c4920836585397f4caef83c6d955cca6f0074b212fa96a4

  • SSDEEP

    24576:q2G/nvxW3WXlB6Fh3rXTamAQ8uwoqTWy1Y7i887KtU:qbA3q4h3rD5DiT1T2O

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 21 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 5 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Scheduled Task/Job: Scheduled Task 1 TTPs 21 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 2 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\F7361ED3503F11A56E8CC53AD6C277B8.exe
    "C:\Users\Admin\AppData\Local\Temp\F7361ED3503F11A56E8CC53AD6C277B8.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2528
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\surrogateserverreviewsession\pmMvwz3lY7qlA.vbe"
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2244
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c ""C:\surrogateserverreviewsession\cAWYZg0ZdjD2dKs6hjKja7TASB4qz.bat" "
        3⤵
        • Loads dropped DLL
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2876
        • C:\surrogateserverreviewsession\Agentserver.exe
          "C:\surrogateserverreviewsession\Agentserver.exe"
          4⤵
          • Executes dropped EXE
          • Drops file in Program Files directory
          • Drops file in Windows directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2032
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\7eX8iZmwI9.bat"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:2152
            • C:\Windows\system32\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              6⤵
                PID:2400
              • C:\MSOCache\All Users\{90140000-00A1-0409-0000-0000000FF1CE}-C\Agentserver.exe
                "C:\MSOCache\All Users\{90140000-00A1-0409-0000-0000000FF1CE}-C\Agentserver.exe"
                6⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:2312
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\v1.0\taskhost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2756
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\v1.0\taskhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2812
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\v1.0\taskhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2940
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "AgentserverA" /sc MINUTE /mo 12 /tr "'C:\MSOCache\All Users\{90140000-00A1-0409-0000-0000000FF1CE}-C\Agentserver.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2192
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Agentserver" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-00A1-0409-0000-0000000FF1CE}-C\Agentserver.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1156
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "AgentserverA" /sc MINUTE /mo 5 /tr "'C:\MSOCache\All Users\{90140000-00A1-0409-0000-0000000FF1CE}-C\Agentserver.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2744
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 13 /tr "'C:\MSOCache\All Users\{90140000-0018-0409-0000-0000000FF1CE}-C\sppsvc.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2452
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0018-0409-0000-0000000FF1CE}-C\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1700
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 5 /tr "'C:\MSOCache\All Users\{90140000-0018-0409-0000-0000000FF1CE}-C\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1472
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Windows NT\TableTextService\audiodg.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2352
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows NT\TableTextService\audiodg.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1392
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Windows NT\TableTextService\audiodg.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:784
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 10 /tr "'C:\Windows\ehome\de-DE\audiodg.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1656
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\Windows\ehome\de-DE\audiodg.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1956
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 13 /tr "'C:\Windows\ehome\de-DE\audiodg.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2872
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 13 /tr "'C:\surrogateserverreviewsession\csrss.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1148
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\surrogateserverreviewsession\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1352
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\surrogateserverreviewsession\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2336
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsml" /sc MINUTE /mo 13 /tr "'C:\MSOCache\All Users\{90140000-0115-0409-0000-0000000FF1CE}-C\1033\lsm.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:696
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0115-0409-0000-0000000FF1CE}-C\1033\lsm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1016
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsml" /sc MINUTE /mo 5 /tr "'C:\MSOCache\All Users\{90140000-0115-0409-0000-0000000FF1CE}-C\1033\lsm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:548

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\7eX8iZmwI9.bat

      Filesize

      243B

      MD5

      a780006335aae031ca72c51a4e5832a7

      SHA1

      2296aff2ef4b9ac2f3cf1addf6987e7d2752c74f

      SHA256

      779ee3c56205704471a059a9d1a63751dc94fd60a67fa9e756581f52e6ff27e8

      SHA512

      d361e1bcc26a783e31e60aae33d68d4a3ebfafcd2931daee879fe8579b36688d1ee27446110e0e804e7f7fe241937c0937dde5eafc54532eabe02df6ffe54203

    • C:\Users\Admin\AppData\Local\Temp\Cab956.tmp

      Filesize

      70KB

      MD5

      49aebf8cbd62d92ac215b2923fb1b9f5

      SHA1

      1723be06719828dda65ad804298d0431f6aff976

      SHA256

      b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

      SHA512

      bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

    • C:\Users\Admin\AppData\Local\Temp\Tar9B6.tmp

      Filesize

      181KB

      MD5

      4ea6026cf93ec6338144661bf1202cd1

      SHA1

      a1dec9044f750ad887935a01430bf49322fbdcb7

      SHA256

      8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

      SHA512

      6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

    • C:\surrogateserverreviewsession\cAWYZg0ZdjD2dKs6hjKja7TASB4qz.bat

      Filesize

      49B

      MD5

      92e94bdecb9521be3a47f97d2e66384e

      SHA1

      eee4fd6f12d9d0194d0bcc5703e11dfc23a3ad5b

      SHA256

      e248596953f8a96baf8a2d3f4eb134b005aeddeb7f2a7d5943c2788face1ca15

      SHA512

      b5a418ab94b9a8be9d667411e838ee7b16be373aa68d73f5c8bed8f47dc9bc4c38abc8dec7f06f4f778c9aa72abdd0060293c573ad94832e24605ebf60991224

    • C:\surrogateserverreviewsession\pmMvwz3lY7qlA.vbe

      Filesize

      234B

      MD5

      94c156c40c9fa1a17ea1d1be3e874aa1

      SHA1

      95b81d6f87a35f34f81d01c31465c2fe0f743a7b

      SHA256

      33abe968c7250e8fe61d27e7507f8271a989c0bf4ff42133159503f2a4719b5a

      SHA512

      a52e0fcbefed81b7590ceed9b44762520580d946d72a5c3ac36fc6d07a964253a812e75d3ceba42f83dddd15fbe2114f65f7148975fcdd20c78547a59de132ab

    • \surrogateserverreviewsession\Agentserver.exe

      Filesize

      829KB

      MD5

      f1aaac4c20df683e3596c8a7cd3da07e

      SHA1

      928e098dea596d12e22ed56f85cf028bcf27b31f

      SHA256

      f3dd651e1ee7ab505f52e2c269a70e661d06e0eb51285ab41f89b3736352fa89

      SHA512

      613387cc5d808dd7a9199212476a2ff34a92f5919d1ea353b204aa931248b2fbf0efe9261bfca6ddb804621a8d6234df4558cffc326050a9424957de3b05c6e2

    • memory/2032-13-0x0000000000E40000-0x0000000000F16000-memory.dmp

      Filesize

      856KB

    • memory/2312-35-0x00000000012A0000-0x0000000001376000-memory.dmp

      Filesize

      856KB