Resubmissions

21-06-2024 12:22

240621-pj3qhszaka 10

21-06-2024 12:03

240621-n7676ssgkq 10

Analysis

  • max time kernel
    121s
  • max time network
    151s
  • platform
    windows7_x64
  • resource
    win7-20240611-en
  • resource tags

    arch:x64arch:x86image:win7-20240611-enlocale:en-usos:windows7-x64system
  • submitted
    21-06-2024 12:22

General

  • Target

    DCRatBuild.exe

  • Size

    1.1MB

  • MD5

    69119a27d94728deb85e51c343ca0173

  • SHA1

    f93da03f3678056d611196d1c837146277fc68dc

  • SHA256

    f54df54335eb1edb832f6a501d095b0d2011c32a81f061397e04908efab35b3e

  • SHA512

    ce7887a1abaac570a45344efa9793650c39134b89a1aaad5e1cbe8e71985e6515871622334b5da4cad520e865a4c7605e0587bb4174d54fbf129035eb5cd1e6c

  • SSDEEP

    24576:U2G/nvxW3Ww0tzm2QaiULPxZWv7q6cZIrDgVmAk:UbA30BQaVZrmH

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

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

  • 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: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 14 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of FindShellTrayWindow 7 IoCs
  • Suspicious use of SendNotifyMessage 6 IoCs
  • Suspicious use of SetWindowsHookEx 1 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:836
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\PortserverWin\hbvALF5ANwO637LJ.vbe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2016
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c ""C:\PortserverWin\XYXAwlDcaTvxZITkmh1OkrpHr.bat" "
        3⤵
        • Loads dropped DLL
        • Suspicious use of WriteProcessMemory
        PID:2704
        • C:\PortserverWin\serverwin.exe
          "C:\PortserverWin\serverwin.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:2780
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\QtBXlDZwLn.bat"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:1568
            • C:\Windows\system32\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              6⤵
                PID:452
              • C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-A90000000001}\csrss.exe
                "C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-A90000000001}\csrss.exe"
                6⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:1628
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 6 /tr "'C:\Recovery\0f2bee02-28a9-11ef-983f-46d84c032646\System.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2552
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Recovery\0f2bee02-28a9-11ef-983f-46d84c032646\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2508
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 14 /tr "'C:\Recovery\0f2bee02-28a9-11ef-983f-46d84c032646\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2568
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 8 /tr "'C:\PortserverWin\Idle.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2760
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\PortserverWin\Idle.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1356
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 8 /tr "'C:\PortserverWin\Idle.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:576
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Windows Sidebar\it-IT\taskhost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2044
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\it-IT\taskhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1000
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Windows Sidebar\it-IT\taskhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1632
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Windows Sidebar\Gadgets\services.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1116
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\Gadgets\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2844
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Windows Sidebar\Gadgets\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2852
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsml" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Sidebar\lsm.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2968
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\lsm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2556
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsml" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Windows Sidebar\lsm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2196
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 9 /tr "'C:\Program Files\Windows Portable Devices\System.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1912
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Program Files\Windows Portable Devices\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2056
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 9 /tr "'C:\Program Files\Windows Portable Devices\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1984
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 14 /tr "'C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-A90000000001}\csrss.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1744
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-A90000000001}\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1088
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 11 /tr "'C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-A90000000001}\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2684
    • C:\Program Files\VideoLAN\VLC\vlc.exe
      "C:\Program Files\VideoLAN\VLC\vlc.exe" --started-from-file "C:\Users\Admin\Desktop\SubmitGrant.asx"
      1⤵
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      PID:1352
    • C:\Program Files\VideoLAN\VLC\vlc.exe
      "C:\Program Files\VideoLAN\VLC\vlc.exe" --started-from-file "C:\Users\Admin\Desktop\SubmitGrant.asx"
      1⤵
        PID:2144

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\PortserverWin\XYXAwlDcaTvxZITkmh1OkrpHr.bat
        Filesize

        32B

        MD5

        f97003508c4a7da05b8dd7ec2eb5d19d

        SHA1

        57c69807156d660c0394caf53af6d7edb10419ae

        SHA256

        0065d6587056351f930803b1030b2d1b210e41a4a731f3d0e4f55d903a0b80e0

        SHA512

        86c8a7697d0593dc48bd1343af8c114e85fa422380ae7cfcbd549d4b740e7aff4faf23d0ff06d1c7e4b6a1b0f3eafe15ddfbc451d42815ec23b4ee7e6437124d

      • C:\PortserverWin\hbvALF5ANwO637LJ.vbe
        Filesize

        215B

        MD5

        ac7f40d86252e33f7eaa68237c8ef92e

        SHA1

        3cca1a9e29e8ab5a3a72ac9c8eac2c482a0da30b

        SHA256

        90cd9a07fcbef6f39445d04035adbdcde5f1cc91e7f7f084516efbc5ba95c3ca

        SHA512

        1d66fedbc2b1d882b007d4b36c3ffef1c5d550c60ceb14c7517b48e08deb2f7e868fdd419d6545e07fe4a859ff088746f8a6892b9e99a8d2216f7c3a4bc2c694

      • C:\Users\Admin\AppData\Local\Temp\QtBXlDZwLn.bat
        Filesize

        234B

        MD5

        cf051f4087ff2c850f4a53b0cdf8c3d6

        SHA1

        eb3e686cd47065c0a76f4d45dff7e2d9813bfed9

        SHA256

        d1887a3a689af7e6235a3fbe1f71caaca25354abf7e90016e905e8113d556e47

        SHA512

        7b20b7d27c0d55975f59bd0b8040f46738ba2d76d9a3dedf626633a2092e3b6a37901f2b3e6462cdc67e3ab159aafe7e7ba933e032a7567142890d645e4f8641

      • \PortserverWin\serverwin.exe
        Filesize

        828KB

        MD5

        eee8aebed57ea1fb9fb307a967e6892a

        SHA1

        047a0c84eeba395bf99e99872ad56bb35416bb2b

        SHA256

        1d5d6374bc49780c31381696ad42a24369b398a2a85580196c031067f97e621d

        SHA512

        411d5d02d40de7ec4eb4679cc1047df0987060676bbd721efe099c6babbaead2dccdd68a394afe930c96bb34f40c0512ae4ca224c152f02721072cc14c04004d

      • memory/1352-54-0x000000013F750000-0x000000013F848000-memory.dmp
        Filesize

        992KB

      • memory/1352-56-0x000007FEF23C0000-0x000007FEF2676000-memory.dmp
        Filesize

        2.7MB

      • memory/1352-55-0x000007FEFB760000-0x000007FEFB794000-memory.dmp
        Filesize

        208KB

      • memory/1352-57-0x000007FEECA40000-0x000007FEEDAF0000-memory.dmp
        Filesize

        16.7MB

      • memory/1628-35-0x0000000000850000-0x0000000000926000-memory.dmp
        Filesize

        856KB

      • memory/2144-36-0x000000013F750000-0x000000013F848000-memory.dmp
        Filesize

        992KB

      • memory/2144-37-0x000007FEFB760000-0x000007FEFB794000-memory.dmp
        Filesize

        208KB

      • memory/2144-39-0x000007FEF7EB0000-0x000007FEF7EC8000-memory.dmp
        Filesize

        96KB

      • memory/2144-40-0x000007FEF7E30000-0x000007FEF7E47000-memory.dmp
        Filesize

        92KB

      • memory/2144-38-0x000007FEF23C0000-0x000007FEF2676000-memory.dmp
        Filesize

        2.7MB

      • memory/2144-41-0x000007FEF7D50000-0x000007FEF7D61000-memory.dmp
        Filesize

        68KB

      • memory/2780-13-0x00000000008B0000-0x0000000000986000-memory.dmp
        Filesize

        856KB