Analysis

  • max time kernel
    23s
  • max time network
    25s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-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 17 IoCs

    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 3 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 2 IoCs
  • Adds Run key to start application 2 TTPs 10 IoCs
  • Drops file in Program Files directory 7 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.

  • Suspicious behavior: EnumeratesProcesses 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 31 IoCs
  • Suspicious use of SendNotifyMessage 31 IoCs
  • Suspicious use of WriteProcessMemory 21 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⤵
    • Suspicious use of WriteProcessMemory
    PID:2696
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\comsurrogateServercommon\ohhgw1nntQ9XkKMgv86C7qCUupIEIA.vbe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2216
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c ""C:\comsurrogateServercommon\BU5c99cqg2jzc.bat" "
        3⤵
        • Loads dropped DLL
        • Suspicious use of WriteProcessMemory
        PID:2092
        • C:\comsurrogateServercommon\mscomAgent.exe
          "C:\comsurrogateServercommon\mscomAgent.exe"
          4⤵
          • DcRat
          • Modifies WinLogon for persistence
          • Executes dropped EXE
          • Adds Run key to start application
          • Drops file in Program Files directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2632
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\pNRQkraVyd.bat"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:2244
            • C:\Windows\system32\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              6⤵
                PID:1360
              • C:\Program Files (x86)\Windows Sidebar\it-IT\smss.exe
                "C:\Program Files (x86)\Windows Sidebar\it-IT\smss.exe"
                6⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:2352
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Google\Temp\smss.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2524
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Program Files (x86)\Google\Temp\smss.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2648
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Google\Temp\smss.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2428
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 14 /tr "'C:\comsurrogateServercommon\lsass.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2580
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\comsurrogateServercommon\lsass.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2452
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 12 /tr "'C:\comsurrogateServercommon\lsass.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1696
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Internet Explorer\ja-JP\Idle.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1596
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Program Files (x86)\Internet Explorer\ja-JP\Idle.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1548
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Internet Explorer\ja-JP\Idle.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2384
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Sidebar\it-IT\smss.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1900
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\it-IT\smss.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1660
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Windows Sidebar\it-IT\smss.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1824
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 5 /tr "'C:\MSOCache\All Users\{90140000-0016-0409-0000-0000000FF1CE}-C\conhost.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2340
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0016-0409-0000-0000000FF1CE}-C\conhost.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1584
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 11 /tr "'C:\MSOCache\All Users\{90140000-0016-0409-0000-0000000FF1CE}-C\conhost.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:360
    • C:\Windows\system32\taskmgr.exe
      "C:\Windows\system32\taskmgr.exe" /4
      1⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:852

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          pNRQkraVyd.bat

          • Path C:\Users\Admin\AppData\Local\Temp\pNRQkraVyd.bat
          • Size 218B
          • SHA256 ff637484860ed09284cebb22104d3bc1ab6c51e1683d7e1e751d4c795b5672ee
          • MD5 SHA1 SHA512

          BU5c99cqg2jzc.bat

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

          ohhgw1nntQ9XkKMgv86C7qCUupIEIA.vbe

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

          mscomAgent.exe

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

          memory/852-36-0x0000000140000000-0x00000001405E8000-memory.dmp

          memory/852-35-0x0000000140000000-0x00000001405E8000-memory.dmp

          memory/2352-40-0x00000000002F0000-0x0000000000302000-memory.dmp

          memory/2352-39-0x0000000000D10000-0x0000000000F60000-memory.dmp

          memory/2632-16-0x0000000000860000-0x00000000008B6000-memory.dmp

          memory/2632-19-0x0000000000590000-0x0000000000598000-memory.dmp

          memory/2632-18-0x0000000000410000-0x000000000041E000-memory.dmp

          memory/2632-17-0x00000000003B0000-0x00000000003C2000-memory.dmp

          memory/2632-15-0x00000000003D0000-0x00000000003E6000-memory.dmp

          memory/2632-14-0x0000000000390000-0x00000000003AC000-memory.dmp

          memory/2632-13-0x0000000000110000-0x0000000000360000-memory.dmp