Overview

overview

10

Static

static

10

DCRatBuild.exe

windows7-x64

10

DCRatBuild.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    149s
  • max time network
    49s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13/06/2024, 22:52

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General

  • Target

    DCRatBuild.exe

  • Size

    1.1MB

  • MD5

    4c40088e4f1835614a5a1088056699e2

  • SHA1

    4b78a9fad74e75b67cb6626679166f611171a161

  • SHA256

    e51f8d90fb3698bd568b693c41927bdee20c799e823bd4630a061454d3264309

  • SHA512

    2717db3fa71493bfee3acb5b6a40a15ba5f9522be230ac5376f1317b964cc29050d84b9bdd2a84066d9d7b96cbcd7f73faebfad3d21b2a8172c548b4c1a8f685

  • SSDEEP

    24576:U2G/nvxW3Ww0t2onGju9hMij7DTA9LX9GmN6ya4+o:UbA30Vd9aqM9Lbai

Score
10/10
dcratinfostealerrat

Malware Config

Signatures

  • DcRat

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

    ratinfostealerdcrat
  • Process spawned unexpected child process 6 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.

    rat
  • 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).

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Creates scheduled task(s) 1 TTPs 6 IoCs

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

    persistence
  • Modifies registry class 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 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.

    persistence

Processes

  • C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe
    "C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:4804
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\MsReviewsession\yO3BOIbzunvfadK9o.vbe"
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:224
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\MsReviewsession\iOUbd.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3528
        • C:\MsReviewsession\PortWeb.exe
          "C:\MsReviewsession\PortWeb.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:4580
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\lE8uvMQz6N.bat"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:2184
            • C:\Windows\system32\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              6⤵
                PID:4816
              • C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\explorer.exe
                "C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\explorer.exe"
                6⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:5068
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 14 /tr "'C:\MsReviewsession\dllhost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3440
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\MsReviewsession\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3736
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 13 /tr "'C:\MsReviewsession\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1080
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorere" /sc MINUTE /mo 8 /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\explorer.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2416
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\explorer.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:872
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorere" /sc MINUTE /mo 13 /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\explorer.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:5004
    • C:\Windows\system32\taskmgr.exe
      "C:\Windows\system32\taskmgr.exe" /4
      1⤵
      • Checks SCSI registry key(s)
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:960

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          • C:\MsReviewsession\PortWeb.exe
            Filesize

            829KB

            MD5

            8b03716cc54bbca6ef5d9a611e57bae8

            SHA1

            c0853a0fbfde846f94dc9aea05908b745f36cac2

            SHA256

            9e11fd15f5cd01ef1abc858da09943a4d10646b495b1b2dcefae2ca61ee1741b

            SHA512

            49961849720f1ee7f2260e1683b046ba26fff6c8ff7abe818d9c158aa3b7f69d83ac9615c8bcffad7512eb900105d2fcea56b1a4fabe527423b332a02c2b3034

            Download Submit

          • C:\MsReviewsession\iOUbd.bat
            Filesize

            32B

            MD5

            f2c01fc7f2af46de03aae93540aa68e0

            SHA1

            914395bb0d9b16f3af93eff925f3b518950bbd35

            SHA256

            f1265433eed8e39b8969eb0bfdff53079a2fb414c552bc16d2e6b9c2b7ddf467

            SHA512

            5b6b68db4ecfac92ae6bb6b57b9eb402ae416090c384c88737bcc4280343eebcdc4715627f6cce39965e0ac26147771bc2be329778b1bb3d4c300d75cd1f2fd7

            Download Submit

          • C:\MsReviewsession\yO3BOIbzunvfadK9o.vbe
            Filesize

            197B

            MD5

            4c8b86faed61558028921999a343ef68

            SHA1

            0bffd3004d6421de0a02dc25aaa92bf70f805a90

            SHA256

            028f593ae44a66648497644d987f5fea9ab3ea946a161ca90208115643f45763

            SHA512

            21f032a1c36556e5f7c17f0d8d2c07383d45e19404aefef7515258bc4a40b2369c29765824513d4b1fc7ee0b3a7aa8bdd8ae2f200706492a5f774c510badc461

            Download Submit

          • C:\Users\Admin\AppData\Local\Temp\lE8uvMQz6N.bat
            Filesize

            240B

            MD5

            08c288f6ddd9d606dd6389242922a0e3

            SHA1

            36fcef6f536bdd6f4f9dff9fecbec4bcf9149d75

            SHA256

            0f279d37823debb829988aac0cf8c9b43413534e97acbacd9ef9244521c25648

            SHA512

            34ce157981c082d94a3d3ab9e4041340fa87bfff5d06f689dac5522d4b8b0854f8ae0eae81b447a6730f434c038d1feab2b83cd4fec87fcf664b45e2688e6832

            Download Submit

          • memory/960-38-0x0000021155EC0000-0x0000021155EC1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/960-28-0x0000021155EC0000-0x0000021155EC1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/960-29-0x0000021155EC0000-0x0000021155EC1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/960-30-0x0000021155EC0000-0x0000021155EC1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/960-35-0x0000021155EC0000-0x0000021155EC1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/960-40-0x0000021155EC0000-0x0000021155EC1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/960-39-0x0000021155EC0000-0x0000021155EC1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/960-37-0x0000021155EC0000-0x0000021155EC1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/960-36-0x0000021155EC0000-0x0000021155EC1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/960-34-0x0000021155EC0000-0x0000021155EC1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/4580-13-0x0000000000050000-0x0000000000126000-memory.dmp

            Filesize

            856KB

            Download

          • memory/4580-12-0x00007FFA2AE23000-0x00007FFA2AE25000-memory.dmp

            Filesize

            8KB

            Download