Analysis

  • max time kernel
    93s
  • max time network
    144s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    30/12/2024, 02:08

General

  • Target

    2a31d3dc6783dad77df215a986789fb27933fe4b5c59705eb20c256788d4533c.exe

  • Size

    1.1MB

  • MD5

    027bbb0a4d9b911c6d707866e98c1314

  • SHA1

    bfbdb849dcf89395492d916b69308505b87bb7fc

  • SHA256

    2a31d3dc6783dad77df215a986789fb27933fe4b5c59705eb20c256788d4533c

  • SHA512

    a66535cebff5e208c685c9f7a880e7bf36a70872cabd512ffdb8e97497c9f4438f7ebc213303487d9a652f1dabdbc438b5bd98be1cd0ed1accfe896cac69e94c

  • SSDEEP

    24576:U2G/nvxW3Ww0t9XYOIWhhyjpaMwvhIhL2pCrC:UbA309YOIXEElW

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 18 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 4 IoCs
  • Drops file in Windows directory 3 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.

  • Modifies registry class 2 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 18 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 4 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\2a31d3dc6783dad77df215a986789fb27933fe4b5c59705eb20c256788d4533c.exe
    "C:\Users\Admin\AppData\Local\Temp\2a31d3dc6783dad77df215a986789fb27933fe4b5c59705eb20c256788d4533c.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:2804
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\refBrokerDhcp\QElwSQf83XBFhMyqm1gWbbiKf8tDaQ.vbe"
      2⤵
      • Checks computer location settings
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:1984
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\refBrokerDhcp\eop7KwarhdN0r.bat" "
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:3640
        • C:\refBrokerDhcp\msbrowser.exe
          "C:\refBrokerDhcp\msbrowser.exe"
          4⤵
          • Checks computer location settings
          • Executes dropped EXE
          • 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
          PID:2200
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\tKvCd3mm0w.bat"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:2344
            • C:\Windows\system32\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              6⤵
                PID:1508
              • C:\Recovery\WindowsRE\SppExtComObj.exe
                "C:\Recovery\WindowsRE\SppExtComObj.exe"
                6⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:544
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 8 /tr "'C:\Windows\debug\csrss.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4252
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\debug\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2792
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\Windows\debug\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:752
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\SppExtComObj.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1244
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\SppExtComObj.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4940
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\SppExtComObj.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2968
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 11 /tr "'C:\Program Files\Microsoft Office 15\ClientX64\Idle.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2416
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Program Files\Microsoft Office 15\ClientX64\Idle.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2760
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 12 /tr "'C:\Program Files\Microsoft Office 15\ClientX64\Idle.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4788
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 9 /tr "'C:\Program Files\7-Zip\Lang\dwm.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4796
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Program Files\7-Zip\Lang\dwm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2520
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 8 /tr "'C:\Program Files\7-Zip\Lang\dwm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1740
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\SearchApp.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3900
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\SearchApp.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3668
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\SearchApp.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4224
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\smss.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4896
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\smss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3168
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\smss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3972

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          • C:\Users\Admin\AppData\Local\Temp\tKvCd3mm0w.bat

            Filesize

            203B

            MD5

            4107ec216c41040becf6bef77a6801d7

            SHA1

            2554eb8fe971cc56cb96655af7fd3b77e5da24e6

            SHA256

            5144cb03f52535e7201c98a9c143b719595353b6c202e7fb605022a7521dc98c

            SHA512

            5e67cef2e1f0dabd6eefdb66c12e6045865d322e47af54f4523d062398599e443e0933c4b50035d313c60fee70bea4f0c78fa5be903f754d7a26bc9d510b448a

          • C:\refBrokerDhcp\QElwSQf83XBFhMyqm1gWbbiKf8tDaQ.vbe

            Filesize

            203B

            MD5

            c54e49eaeb59c57e0d7bb2398e8ea617

            SHA1

            3e6bed8fb43f94c190bcdbfe33e9ba826275dfd6

            SHA256

            0bcb8b3296b1b862104bc1917793a1b743afc9e623d91f5136fbf30ae7e022ed

            SHA512

            d24dcd18188176f796b92d150b30d3b99c03654257fe48019308cca5ebb062c7312047fec43e0fa6823ff4ea29649c4f8db61f2ba950881df8a52ec15b662b85

          • C:\refBrokerDhcp\eop7KwarhdN0r.bat

            Filesize

            32B

            MD5

            65cbca0f14030e37f4536942be742fed

            SHA1

            1823a610cfb0945e0e234651d4045931aa241ba5

            SHA256

            7d881d8c2a5a8756b85abe067e24efdc7c657d1af28ba1132d0e9ae443941d5d

            SHA512

            87eb63d67e28c0f42c1b89c631c4573d0d8f9dc145f3720d26d3af8f7dc76e7d105b0598fe398f9e73d95e814301678097be811977c184ea2e101d4e0e8cc044

          • C:\refBrokerDhcp\msbrowser.exe

            Filesize

            828KB

            MD5

            3d428539f2cddf97abfe6586df2f2c1d

            SHA1

            e828475a8e5ea8db3854cb66f0102c6532a0a997

            SHA256

            58a180ba10aad7f5a7c9b86b2f93213fde5e2f4816393d7a19ddc9202bc1f7a4

            SHA512

            325d96a63e0ddec4bb2c4c9fafa28b38c6961af0f4c282763eb82677037a50971ac2770c8277a11a80d7853218cc560600c18f7d201f23057387e0a858d05ccc

          • memory/2200-12-0x00007FFBF20B3000-0x00007FFBF20B5000-memory.dmp

            Filesize

            8KB

          • memory/2200-13-0x00000000002D0000-0x00000000003A6000-memory.dmp

            Filesize

            856KB