Analysis

  • max time kernel
    30s
  • max time network
    31s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240508-en
  • resource tags

    arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    16/05/2024, 21:34

General

  • Target
    XNXBot Test v5.exe
  • Size 2.6MB
  • Sample240516-1erm8she46
  • SHA256 0bf62e7a92cc0f2241f582c7ee1feb647dba3557e61b389b50f97032f73eba25
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • DcRat

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

  • Modifies WinLogon for persistence 2 TTPs 5 IoCs
  • Process spawned unexpected child process 15 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.

  • Executes dropped EXE 2 IoCs
  • Adds Run key to start application 2 TTPs 10 IoCs
  • Drops file in Program Files directory 3 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 15 IoCs

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

  • Modifies registry class 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 19 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 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.

Processes

  • C:\Users\Admin\AppData\Local\Temp\XNXBot Test v5.exe
    "C:\Users\Admin\AppData\Local\Temp\XNXBot Test v5.exe"
    1⤵
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:3040
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\comsurrogateServercommon\ohhgw1nntQ9XkKMgv86C7qCUupIEIA.vbe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3184
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\comsurrogateServercommon\BU5c99cqg2jzc.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1852
        • C:\comsurrogateServercommon\mscomAgent.exe
          "C:\comsurrogateServercommon\mscomAgent.exe"
          4⤵
          • Modifies WinLogon for persistence
          • Executes dropped EXE
          • Adds Run key to start application
          • 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:1256
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\l2HJFN91K7.bat"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:2484
            • C:\Windows\system32\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              6⤵
                PID:2344
              • C:\Windows\Speech_OneCore\services.exe
                "C:\Windows\Speech_OneCore\services.exe"
                6⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of SetWindowsHookEx
                PID:1820
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 9 /tr "'C:\Users\Public\Videos\lsass.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4936
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Users\Public\Videos\lsass.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4536
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 11 /tr "'C:\Users\Public\Videos\lsass.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2024
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "mscomAgentm" /sc MINUTE /mo 12 /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\mscomAgent.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4688
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "mscomAgent" /sc ONLOGON /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\mscomAgent.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2340
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "mscomAgentm" /sc MINUTE /mo 8 /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\mscomAgent.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4164
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 11 /tr "'C:\comsurrogateServercommon\StartMenuExperienceHost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4632
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\comsurrogateServercommon\StartMenuExperienceHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:388
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 5 /tr "'C:\comsurrogateServercommon\StartMenuExperienceHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4072
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 13 /tr "'C:\Windows\Speech_OneCore\services.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3900
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\Speech_OneCore\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2632
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 5 /tr "'C:\Windows\Speech_OneCore\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3428
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 13 /tr "'C:\Users\All Users\Desktop\System.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3456
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Users\All Users\Desktop\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1600
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 12 /tr "'C:\Users\All Users\Desktop\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:488

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          l2HJFN91K7.bat

          • Path C:\Users\Admin\AppData\Local\Temp\l2HJFN91K7.bat
          • Size 203B
          • SHA256 7c59d862e8ce739d43bde5321a9b3e6143ad15996e264b38afa10e4d21d10792
          • MD5 SHA1 SHA512

          BU5c99cqg2jzc.bat

          • Path C:\comsurrogateServercommon\BU5c99cqg2jzc.bat
          • Size 55B
          • SHA256 d7105ee692b694f449108c533bd361b5d7d6a41602acb5f9daaa611800a4119d
          • MD5 SHA1 SHA512

          mscomAgent.exe

          • Path C:\comsurrogateServercommon\mscomAgent.exe
          • Size 2.3MB
          • SHA256 8ed97cc29cf906767eeafc2f01ae853688add73580061c50b96235babb545f24
          • MD5 SHA1 SHA512 SSDEEP

          ohhgw1nntQ9XkKMgv86C7qCUupIEIA.vbe

          • Path C:\comsurrogateServercommon\ohhgw1nntQ9XkKMgv86C7qCUupIEIA.vbe
          • Size 225B
          • SHA256 0467ec4409e7abe4c793aa799094039859c212506a20d7ff78a5283697fbbc75
          • MD5 SHA1 SHA512

          memory/1256-19-0x000000001CA70000-0x000000001CF98000-memory.dmp

          memory/1256-21-0x000000001C540000-0x000000001C548000-memory.dmp

          memory/1256-17-0x000000001C4F0000-0x000000001C546000-memory.dmp

          memory/1256-16-0x000000001C450000-0x000000001C466000-memory.dmp

          memory/1256-15-0x000000001C4A0000-0x000000001C4F0000-memory.dmp

          memory/1256-18-0x0000000003290000-0x00000000032A2000-memory.dmp

          memory/1256-13-0x0000000000F40000-0x0000000001190000-memory.dmp

          memory/1256-14-0x000000001C430000-0x000000001C44C000-memory.dmp

          memory/1256-20-0x000000001C490000-0x000000001C49E000-memory.dmp

          memory/1256-12-0x00007FFD124B3000-0x00007FFD124B5000-memory.dmp

          memory/1820-41-0x000000001C980000-0x000000001C992000-memory.dmp

          memory/1820-43-0x000000001D160000-0x000000001D169000-memory.dmp

          memory/1820-44-0x000000001E010000-0x000000001E01D000-memory.dmp

          memory/1820-46-0x000000001E040000-0x000000001E04B000-memory.dmp

          memory/1820-45-0x000000001E020000-0x000000001E03E000-memory.dmp

          memory/1820-42-0x000000001DDB0000-0x000000001DDF6000-memory.dmp