Analysis

  • max time kernel
    142s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/12/2022, 22:24

General

  • Target
    file.exe
  • Size 1.9MB
  • Sample221219-2bdgwabd51
  • SHA256 8a2ca0027527f9c95ae338ad7eec0f9a71f07ff24f2d0af818aecc840f631b0d
  • 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 21 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 3 IoCs
  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of NtSetInformationThreadHideFromDebugger 14 IoCs
  • Drops file in Program Files directory 8 IoCs
  • Drops file in Windows directory 7 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 21 IoCs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 34 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:800
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\RarSFX0\1.bat" "
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2828
      • C:\Users\Admin\AppData\Local\Temp\RarSFX0\work.exe
        work.exe -priverdD
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Suspicious use of WriteProcessMemory
        PID:1404
        • C:\Users\Admin\AppData\Local\Temp\RarSFX1\fesg.exe
          "C:\Users\Admin\AppData\Local\Temp\RarSFX1\fesg.exe"
          4⤵
          • Executes dropped EXE
          • Checks computer location settings
          • Suspicious use of NtSetInformationThreadHideFromDebugger
          • Drops file in Program Files directory
          • Drops file in Windows directory
          • Modifies registry class
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:1460
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\chy53L9hAW.bat"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:992
            • C:\Windows\SysWOW64\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              6⤵
              • Suspicious use of WriteProcessMemory
              PID:3968
              • C:\Windows\system32\w32tm.exe
                w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
                7⤵
                  PID:3948
              • C:\Windows\TAPI\taskhostw.exe
                "C:\Windows\TAPI\taskhostw.exe"
                6⤵
                • Executes dropped EXE
                • Suspicious use of NtSetInformationThreadHideFromDebugger
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of SetWindowsHookEx
                PID:1572
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 13 /tr "'C:\Windows\Cursors\spoolsv.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4196
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\Cursors\spoolsv.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1952
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 13 /tr "'C:\Windows\Cursors\spoolsv.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1688
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 8 /tr "'C:\Program Files\Windows Portable Devices\RuntimeBroker.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3620
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Windows Portable Devices\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:220
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Program Files\Windows Portable Devices\RuntimeBroker.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 "taskhostwt" /sc MINUTE /mo 7 /tr "'C:\Windows\TAPI\taskhostw.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1432
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Windows\TAPI\taskhostw.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:684
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 8 /tr "'C:\Windows\TAPI\taskhostw.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3904
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fesgf" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\fesg.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4768
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fesg" /sc ONLOGON /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\fesg.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1648
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fesgf" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\fesg.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4148
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Reference Assemblies\winlogon.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4796
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files (x86)\Reference Assemblies\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3052
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Reference Assemblies\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1076
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 6 /tr "'C:\Windows\Microsoft.NET\assembly\GAC_32\Microsoft.AppV.AppvClientComConsumer.Resources\SppExtComObj.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2788
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Windows\Microsoft.NET\assembly\GAC_32\Microsoft.AppV.AppvClientComConsumer.Resources\SppExtComObj.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4660
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 5 /tr "'C:\Windows\Microsoft.NET\assembly\GAC_32\Microsoft.AppV.AppvClientComConsumer.Resources\SppExtComObj.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1660
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 8 /tr "'C:\Program Files\Windows Media Player\Skins\upfc.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1148
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Program Files\Windows Media Player\Skins\upfc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2824
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 6 /tr "'C:\Program Files\Windows Media Player\Skins\upfc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4596

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          1.bat

          • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\1.bat
          • Size 35B
          • SHA256 065d2b17ad499587dc9de7ee9ecda4938b45da1df388bc72e6627dff220f64d2
          • MD5 SHA1 SHA512

          work.exe

          • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\work.exe
          • Size 1.7MB
          • SHA256 26e61186a405c7ba6614cf47a1b363ea35e9406aaa667ac58f2dcb36525398dc
          • MD5 SHA1 SHA512 SSDEEP

          work.exe

          • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\work.exe
          • Size 1.7MB
          • SHA256 26e61186a405c7ba6614cf47a1b363ea35e9406aaa667ac58f2dcb36525398dc
          • MD5 SHA1 SHA512 SSDEEP

          fesg.exe

          • Path C:\Users\Admin\AppData\Local\Temp\RarSFX1\fesg.exe
          • Size 1.4MB
          • SHA256 ef665c001e7cf59486abf7a79d1ef9fbd5daa557feb81e7a1deac8d98b49f9ea
          • MD5 SHA1 SHA512 SSDEEP

          fesg.exe

          • Path C:\Users\Admin\AppData\Local\Temp\RarSFX1\fesg.exe
          • Size 1.4MB
          • SHA256 ef665c001e7cf59486abf7a79d1ef9fbd5daa557feb81e7a1deac8d98b49f9ea
          • MD5 SHA1 SHA512 SSDEEP

          chy53L9hAW.bat

          • Path C:\Users\Admin\AppData\Local\Temp\chy53L9hAW.bat
          • Size 194B
          • SHA256 7ee5cbd218598084c4bc01fae31729ebf9b0fd25166c6eb5f4f93969aac8aae7
          • MD5 SHA1 SHA512

          taskhostw.exe

          • Path C:\Windows\TAPI\taskhostw.exe
          • Size 1.4MB
          • SHA256 ef665c001e7cf59486abf7a79d1ef9fbd5daa557feb81e7a1deac8d98b49f9ea
          • MD5 SHA1 SHA512 SSDEEP

          taskhostw.exe

          • Path C:\Windows\TAPI\taskhostw.exe
          • Size 1.4MB
          • SHA256 ef665c001e7cf59486abf7a79d1ef9fbd5daa557feb81e7a1deac8d98b49f9ea
          • MD5 SHA1 SHA512 SSDEEP

          memory/1460-144-0x0000000006280000-0x00000000062E6000-memory.dmp

          memory/1460-143-0x00000000060C0000-0x0000000006110000-memory.dmp

          memory/1460-142-0x0000000006350000-0x00000000068F4000-memory.dmp

          memory/1460-141-0x0000000000260000-0x000000000067C000-memory.dmp

          memory/1460-140-0x0000000000260000-0x000000000067C000-memory.dmp

          memory/1460-148-0x0000000000260000-0x000000000067C000-memory.dmp

          memory/1572-153-0x0000000000970000-0x0000000000D8C000-memory.dmp

          memory/1572-154-0x0000000000970000-0x0000000000D8C000-memory.dmp

          memory/1572-155-0x0000000000970000-0x0000000000D8C000-memory.dmp

          memory/1572-156-0x0000000006E40000-0x0000000006ED2000-memory.dmp