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

Sharing

Copy URL Twitter E-mail
Report Analysis Logs

General

  • Target
    DCRatBuild.exe
  • Size 1.1MB
  • Sample240613-2ttltatfla
  • SHA256 e51f8d90fb3698bd568b693c41927bdee20c799e823bd4630a061454d3264309
  • MD5 SHA1 SHA512 SSDEEP
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

          Loading Replay Monitor...

          Downloads

          PortWeb.exe
          • Path C:\MsReviewsession\PortWeb.exe
          • Size 829KB
          • SHA256 9e11fd15f5cd01ef1abc858da09943a4d10646b495b1b2dcefae2ca61ee1741b
          • MD5 SHA1 SHA512 SSDEEP
          Submit Download

          iOUbd.bat
          • Path C:\MsReviewsession\iOUbd.bat
          • Size 32B
          • SHA256 f1265433eed8e39b8969eb0bfdff53079a2fb414c552bc16d2e6b9c2b7ddf467
          • MD5 SHA1 SHA512
          Submit Download

          yO3BOIbzunvfadK9o.vbe
          • Path C:\MsReviewsession\yO3BOIbzunvfadK9o.vbe
          • Size 197B
          • SHA256 028f593ae44a66648497644d987f5fea9ab3ea946a161ca90208115643f45763
          • MD5 SHA1 SHA512
          Submit Download

          lE8uvMQz6N.bat
          • Path C:\Users\Admin\AppData\Local\Temp\lE8uvMQz6N.bat
          • Size 240B
          • SHA256 0f279d37823debb829988aac0cf8c9b43413534e97acbacd9ef9244521c25648
          • MD5 SHA1 SHA512
          Submit Download

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

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

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

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

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

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

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

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

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

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

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

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