Analysis

  • max time kernel
    149s
  • max time network
    127s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260130-en
  • resource tags

    arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    24/04/2026, 22:38

General

  • Target
    DCRatBuild.exe
  • Size 1.1MB
  • Sample260424-2kr2maew3p
  • SHA256 165b1c1b49febea0873894eeb6c808170943d02da8cb7fc3fffa636528b339b2
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Family: DcRat

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

  • DCRat payload 2 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Process spawned unexpected child process 15 IoCs

    This typically indicates the parent process was compromised via an exploit or macro.

  • Executes dropped EXE 7 IoCs
  • Contacts third-party web service commonly abused for C2 1 TTPs 2 IoCs

    Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.

  • Drops file in Program Files directory 7 IoCs
  • Drops file in Windows directory 1 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 15 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 13 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of WriteProcessMemory 7 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⤵
    • System Location Discovery: System Language Discovery
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:4708
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\SurrogateRefbrokercrt\TJIPXZ1yt.vbe"
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:3464
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\SurrogateRefbrokercrt\jt8xO24p5NQDb5Q9aCeJAGLTHcI6x.bat" "
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:460
        • C:\SurrogateRefbrokercrt\msChain.exe
          "C:\SurrogateRefbrokercrt\msChain.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:5324
          • C:\SurrogateRefbrokercrt\cmd.exe
            "C:\SurrogateRefbrokercrt\cmd.exe"
            5⤵
            • Executes dropped EXE
            • Modifies registry class
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:4012
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\gJVLZ7RDs3.bat"
              6⤵
              • Suspicious use of WriteProcessMemory
              PID:324
              • C:\Windows\system32\w32tm.exe
                w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
                7⤵
                  PID:5168
                • C:\SurrogateRefbrokercrt\cmd.exe
                  "C:\SurrogateRefbrokercrt\cmd.exe"
                  7⤵
                  • Executes dropped EXE
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  PID:5540
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 7 /tr "'C:\Program Files\Microsoft Office 15\ClientX64\services.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2712
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Program Files\Microsoft Office 15\ClientX64\services.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 "servicess" /sc MINUTE /mo 8 /tr "'C:\Program Files\Microsoft Office 15\ClientX64\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3636
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 9 /tr "'C:\SurrogateRefbrokercrt\cmd.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3856
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\SurrogateRefbrokercrt\cmd.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5176
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 6 /tr "'C:\SurrogateRefbrokercrt\cmd.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3148
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 7 /tr "'C:\Program Files\Windows Media Player\Registry.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2104
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Program Files\Windows Media Player\Registry.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4372
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Media Player\Registry.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1308
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "msChainm" /sc MINUTE /mo 11 /tr "'C:\Program Files\Uninstall Information\msChain.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5856
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "msChain" /sc ONLOGON /tr "'C:\Program Files\Uninstall Information\msChain.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5836
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "msChainm" /sc MINUTE /mo 7 /tr "'C:\Program Files\Uninstall Information\msChain.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4084
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\lsass.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4004
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\lsass.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1036
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\lsass.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4460
    • C:\Program Files\Microsoft Office 15\ClientX64\services.exe
      "C:\Program Files\Microsoft Office 15\ClientX64\services.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:2780
    • C:\Program Files\Uninstall Information\msChain.exe
      "C:\Program Files\Uninstall Information\msChain.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1072
    • C:\Program Files\Windows Media Player\Registry.exe
      "C:\Program Files\Windows Media Player\Registry.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:644
    • C:\Recovery\WindowsRE\lsass.exe
      "C:\Recovery\WindowsRE\lsass.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:5320

    Network

          MITRE ATT&CK Enterprise v16

          Replay Monitor

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          Downloads

          TJIPXZ1yt.vbe

          • Path C:\SurrogateRefbrokercrt\TJIPXZ1yt.vbe
          • Size 227B
          • SHA256 936d5f829b602372e59c4573a5f994438c331663ccd053c37929f5a346690dcb
          • MD5 SHA1 SHA512 TLSH

          jt8xO24p5NQDb5Q9aCeJAGLTHcI6x.bat

          • Path C:\SurrogateRefbrokercrt\jt8xO24p5NQDb5Q9aCeJAGLTHcI6x.bat
          • Size 38B
          • SHA256 1b75ab2792d0fed0d38d14470fd1dafd02374be28646d10cc8bfb19ff844d576
          • MD5 SHA1 SHA512

          msChain.exe

          • Path C:\SurrogateRefbrokercrt\msChain.exe
          • Size 827KB
          • SHA256 3f3e54accb490183056af560213747d3ece4f140b7e40047a7095753ccc894b2
          • MD5 SHA1 SHA512 SSDEEP TLSH

          cmd.exe.log

          • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\cmd.exe.log
          • Size 1KB
          • SHA256 5d8af3c7519874ed42a0d74ee559ae30d9cc6930aef213079347e2b47092c210
          • MD5 SHA1 SHA512 TLSH

          msChain.exe.log

          • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\msChain.exe.log
          • Size 1KB
          • SHA256 28e57db6d7535775b5e65c90ab208c7fe392e373056db5d35e76854270ecd05d
          • MD5 SHA1 SHA512 TLSH

          gJVLZ7RDs3.bat

          • Path C:\Users\Admin\AppData\Local\Temp\gJVLZ7RDs3.bat
          • Size 197B
          • SHA256 4ae9c5d14a93a950ece76a8bc4a130588a5277ca67780ac14cec31cc29e292a4
          • MD5 SHA1 SHA512 TLSH

          memory/644-66-0x00000000018C0000-0x00000000018CC000-memory.dmp

          memory/1036-38-0x0000025D15280000-0x0000025D1531E000-memory.dmp

          memory/1072-64-0x00000000017B0000-0x00000000017BC000-memory.dmp

          memory/1308-31-0x0000022F48B20000-0x0000022F48BBE000-memory.dmp

          memory/2104-27-0x0000023137790000-0x000002313782E000-memory.dmp

          memory/2712-19-0x0000022CC8C10000-0x0000022CC8CAE000-memory.dmp

          memory/2780-63-0x000000001AFE0000-0x000000001AFEC000-memory.dmp

          memory/2968-20-0x0000027CC06F0000-0x0000027CC078E000-memory.dmp

          memory/3148-26-0x000002597D000000-0x000002597D09E000-memory.dmp

          memory/3464-10-0x0000000001300000-0x0000000001364000-memory.dmp

          memory/3636-21-0x000001E918220000-0x000001E9182BE000-memory.dmp

          memory/3856-22-0x0000024914EE0000-0x0000024914F7E000-memory.dmp

          memory/4004-37-0x00000201B3DB0000-0x00000201B3E4E000-memory.dmp

          memory/4012-78-0x000000001C8A0000-0x000000001C976000-memory.dmp

          memory/4012-77-0x0000000001760000-0x000000000176C000-memory.dmp

          memory/4012-69-0x0000000001760000-0x000000000176C000-memory.dmp

          memory/4084-36-0x000001C29C4A0000-0x000001C29C53E000-memory.dmp

          memory/4372-30-0x00000193E0340000-0x00000193E03DE000-memory.dmp

          memory/4460-39-0x000001F316120000-0x000001F3161BE000-memory.dmp

          memory/4708-7-0x0000000001960000-0x00000000019C4000-memory.dmp

          memory/5176-25-0x000001FB6D4B0000-0x000001FB6D54E000-memory.dmp

          memory/5320-68-0x000000001C860000-0x000000001C86C000-memory.dmp

          memory/5324-52-0x000000001B7D0000-0x000000001B8A6000-memory.dmp

          memory/5324-51-0x0000000002590000-0x000000000259C000-memory.dmp

          memory/5324-14-0x00000000003C0000-0x0000000000496000-memory.dmp

          memory/5540-82-0x0000000002DF0000-0x0000000002DFC000-memory.dmp

          memory/5540-83-0x0000000002E40000-0x0000000002E52000-memory.dmp

          memory/5540-90-0x0000000002DF0000-0x0000000002DFC000-memory.dmp

          memory/5836-34-0x0000027E10D00000-0x0000027E10D9E000-memory.dmp

          memory/5856-32-0x000001E69B340000-0x000001E69B3DE000-memory.dmp