Analysis

  • max time kernel
    51s
  • max time network
    51s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    16/06/2024, 23:56

General

  • Target
    2f555468f2b76f26648ae61c418ead8a.exe
  • Size 3.0MB
  • Sample240616-3y1flaydnk
  • SHA256 581a31b1ddaa6eea7b78a57b4615d8def8c688aeb0dd38da8a0ef3d248e88892
  • MD5 SHA1 SHA512 SSDEEP
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 18 IoCs

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

  • DCRat payload 4 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Checks computer location settings 2 TTPs 4 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 5 IoCs
  • Drops file in Program Files directory 5 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 18 IoCs

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

  • Modifies registry class 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 20 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\2f555468f2b76f26648ae61c418ead8a.exe
    "C:\Users\Admin\AppData\Local\Temp\2f555468f2b76f26648ae61c418ead8a.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:116
    • C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe
      "C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:1696
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\comsurrogatecommon\h6khYLQAm3C9Gvan2yaD6Idxz.vbe"
        3⤵
        • Checks computer location settings
        • Suspicious use of WriteProcessMemory
        PID:1224
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\comsurrogatecommon\ndyJqdcK3gAQnUI3h5cTrzbsXo5.bat" "
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:4928
          • C:\comsurrogatecommon\containerbrokerSvc.exe
            "C:\comsurrogatecommon\containerbrokerSvc.exe"
            5⤵
            • 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:4504
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Zcu3tEkZRd.bat"
              6⤵
              • Suspicious use of WriteProcessMemory
              PID:2692
              • C:\Windows\system32\w32tm.exe
                w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
                7⤵
                  PID:5000
                • C:\Program Files\Windows Security\BrowserCore\en-US\conhost.exe
                  "C:\Program Files\Windows Security\BrowserCore\en-US\conhost.exe"
                  7⤵
                  • Executes dropped EXE
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  PID:2136
      • C:\Users\Admin\AppData\Local\Temp\Everything-1.4.1.1024.x64-Setup.exe
        "C:\Users\Admin\AppData\Local\Temp\Everything-1.4.1.1024.x64-Setup.exe"
        2⤵
        • Executes dropped EXE
        • Loads dropped DLL
        PID:1552
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 12 /tr "'C:\Program Files\Windows Security\BrowserCore\en-US\conhost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2332
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Program Files\Windows Security\BrowserCore\en-US\conhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4576
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Security\BrowserCore\en-US\conhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4744
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Windows Mail\TextInputHost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2644
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Mail\TextInputHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4524
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Windows Mail\TextInputHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3088
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Everything-1.4.1.1024.x64-SetupE" /sc MINUTE /mo 8 /tr "'C:\Recovery\WindowsRE\Everything-1.4.1.1024.x64-Setup.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1532
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Everything-1.4.1.1024.x64-Setup" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\Everything-1.4.1.1024.x64-Setup.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3756
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Everything-1.4.1.1024.x64-SetupE" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\Everything-1.4.1.1024.x64-Setup.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1272
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:884
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:5012
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:440
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\comsurrogatecommon\RuntimeBroker.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2260
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\comsurrogatecommon\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4480
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 9 /tr "'C:\comsurrogatecommon\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4256
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 8 /tr "'C:\Windows\ModemLogs\smss.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4016
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\ModemLogs\smss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2792
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 12 /tr "'C:\Windows\ModemLogs\smss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3524

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          DCRatBuild.exe

          • Path C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe
          • Size 1.2MB
          • SHA256 8ed1d39fa5617f5f79c94be770549a88452829b56c7a878af030baa1ae060f9b
          • MD5 SHA1 SHA512 SSDEEP

          Everything-1.4.1.1024.x64-Setup.exe

          • Path C:\Users\Admin\AppData\Local\Temp\Everything-1.4.1.1024.x64-Setup.exe
          • Size 1.8MB
          • SHA256 b2afe799584c913532c673f99ade45113bf5a5b605a964ce9fa837f563b6fc21
          • MD5 SHA1 SHA512 SSDEEP

          Zcu3tEkZRd.bat

          • Path C:\Users\Admin\AppData\Local\Temp\Zcu3tEkZRd.bat
          • Size 228B
          • SHA256 226b0d83e526566adfca03df0ad0819fa58f828717e6456edbb13027e627aea4
          • MD5 SHA1 SHA512

          InstallOptions.dll

          • Path C:\Users\Admin\AppData\Local\Temp\nso5016.tmp\InstallOptions.dll
          • Size 15KB
          • SHA256 c7fef6457989d97fecc0616a69947927da9d8c493f7905dc8475c748f044f3cf
          • MD5 SHA1 SHA512 SSDEEP

          LangDLL.dll

          • Path C:\Users\Admin\AppData\Local\Temp\nso5016.tmp\LangDLL.dll
          • Size 5KB
          • SHA256 18e8b40ba22c7a1687bd16e8d585380bc2773fff5002d7d67e9485fcc0c51026
          • MD5 SHA1 SHA512 SSDEEP

          System.dll

          • Path C:\Users\Admin\AppData\Local\Temp\nso5016.tmp\System.dll
          • Size 12KB
          • SHA256 8dc562cda7217a3a52db898243de3e2ed68b80e62ddcb8619545ed0b4e7f65a8
          • MD5 SHA1 SHA512 SSDEEP

          containerbrokerSvc.exe

          • Path C:\comsurrogatecommon\containerbrokerSvc.exe
          • Size 953KB
          • SHA256 88a7db7ae820d84729ca9d9376848544bde2788f300d4303fd1b19c50c4c348d
          • MD5 SHA1 SHA512 SSDEEP

          h6khYLQAm3C9Gvan2yaD6Idxz.vbe

          • Path C:\comsurrogatecommon\h6khYLQAm3C9Gvan2yaD6Idxz.vbe
          • Size 222B
          • SHA256 d178fab8fa489f9f67902f5b777145c321b6f614641c573edeb2da8f22127351
          • MD5 SHA1 SHA512

          ndyJqdcK3gAQnUI3h5cTrzbsXo5.bat

          • Path C:\comsurrogatecommon\ndyJqdcK3gAQnUI3h5cTrzbsXo5.bat
          • Size 46B
          • SHA256 7211497c50c8ffc77a8ef893eca0cd8a6d39a5ed7cde524a9ec503758d0c4715
          • MD5 SHA1 SHA512

          memory/116-17-0x0000000000400000-0x0000000000712000-memory.dmp

          memory/4504-50-0x00000000013C0000-0x00000000013CE000-memory.dmp

          memory/4504-52-0x0000000002E30000-0x0000000002E3C000-memory.dmp

          memory/4504-51-0x0000000002CD0000-0x0000000002CD8000-memory.dmp

          memory/4504-49-0x0000000000B00000-0x0000000000BF6000-memory.dmp