Analysis

  • max time kernel
    148s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19-01-2023 03:16

General

  • Target

    7E649C9E6325C46601A81FD6C0DBF36EE6C85D0EE108C.exe

  • Size

    1.9MB

  • MD5

    3b15c55bae9fefd6585e43490f6bf231

  • SHA1

    3e1815ec0f2fcc83c1aef7173baf749e4547f967

  • SHA256

    7e649c9e6325c46601a81fd6c0dbf36ee6c85d0ee108c333b283140f96b842f6

  • SHA512

    43b870f7feaf9b1290acd23f17d0b22ea678ef93f52b5d89e11f85dc87c6306e3fd45e151784001f502d2261f153737a82578a31cfdf1edd93f8b31d6a86b4bc

  • SSDEEP

    49152:Mb3eYn9rEj80t2CttDha8bCgXLQHkfX68lSurk9JWBKM:MlnmwWttPbC+R68l89r

Malware Config

Signatures

  • DcRat 20 IoCs

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

  • Modifies WinLogon for persistence 2 TTPs 6 IoCs
  • Process spawned unexpected child process 18 IoCs

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

  • DCRat payload 5 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Executes dropped EXE 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Adds Run key to start application 2 TTPs 12 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 17 IoCs
  • Drops file in Program Files directory 5 IoCs
  • Drops file in Windows directory 4 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 18 IoCs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 20 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 11 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\7E649C9E6325C46601A81FD6C0DBF36EE6C85D0EE108C.exe
    "C:\Users\Admin\AppData\Local\Temp\7E649C9E6325C46601A81FD6C0DBF36EE6C85D0EE108C.exe"
    1⤵
    • DcRat
    • Modifies WinLogon for persistence
    • Checks computer location settings
    • Adds Run key to start application
    • 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:3464
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\SYS1L0trOI.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:400
      • C:\Windows\SysWOW64\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2600
        • C:\Windows\system32\w32tm.exe
          w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
          4⤵
            PID:1772
        • C:\Windows\AppReadiness\Idle.exe
          "C:\Windows\AppReadiness\Idle.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious use of NtSetInformationThreadHideFromDebugger
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious behavior: GetForegroundWindowSpam
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          PID:2488
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorere" /sc MINUTE /mo 13 /tr "'C:\Program Files\Java\jdk1.8.0_66\bin\explorer.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4832
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Program Files\Java\jdk1.8.0_66\bin\explorer.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2084
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorere" /sc MINUTE /mo 13 /tr "'C:\Program Files\Java\jdk1.8.0_66\bin\explorer.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3932
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 10 /tr "'C:\Windows\BitLockerDiscoveryVolumeContents\sihost.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4820
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Windows\BitLockerDiscoveryVolumeContents\sihost.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4436
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 5 /tr "'C:\Windows\BitLockerDiscoveryVolumeContents\sihost.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1912
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Windows Media Player\de-DE\System.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4804
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Media Player\de-DE\System.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4780
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Windows Media Player\de-DE\System.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4764
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 14 /tr "'C:\Windows\AppReadiness\Idle.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4720
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Windows\AppReadiness\Idle.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4692
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 6 /tr "'C:\Windows\AppReadiness\Idle.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1224
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\wininit.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1112
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\wininit.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1180
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\wininit.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:892
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 9 /tr "'C:\Users\Default User\smss.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:800
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Users\Default User\smss.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4640
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 12 /tr "'C:\Users\Default User\smss.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4380

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\SYS1L0trOI.bat

      Filesize

      197B

      MD5

      5ffa3ad2239fa9b545bb5d6946888cde

      SHA1

      0bcfa01ac2e461ea64592dbb93f4ea60a73ce24c

      SHA256

      c02997afa0b04f9acdf840127e776b81524b18f40fffc6fa6a1d186a60c1bd12

      SHA512

      9fa265a391e4c75cb6048e2374c543c7454a6bf1d8718f42968f85c5e25d974fb69894dde14c2d284249c3b7ffb6bb2faaa39cd86a98ba2946ecb7f6a644921c

    • C:\Windows\AppReadiness\Idle.exe

      Filesize

      1.9MB

      MD5

      3b15c55bae9fefd6585e43490f6bf231

      SHA1

      3e1815ec0f2fcc83c1aef7173baf749e4547f967

      SHA256

      7e649c9e6325c46601a81fd6c0dbf36ee6c85d0ee108c333b283140f96b842f6

      SHA512

      43b870f7feaf9b1290acd23f17d0b22ea678ef93f52b5d89e11f85dc87c6306e3fd45e151784001f502d2261f153737a82578a31cfdf1edd93f8b31d6a86b4bc

    • C:\Windows\AppReadiness\Idle.exe

      Filesize

      1.9MB

      MD5

      3b15c55bae9fefd6585e43490f6bf231

      SHA1

      3e1815ec0f2fcc83c1aef7173baf749e4547f967

      SHA256

      7e649c9e6325c46601a81fd6c0dbf36ee6c85d0ee108c333b283140f96b842f6

      SHA512

      43b870f7feaf9b1290acd23f17d0b22ea678ef93f52b5d89e11f85dc87c6306e3fd45e151784001f502d2261f153737a82578a31cfdf1edd93f8b31d6a86b4bc

    • memory/400-138-0x0000000000000000-mapping.dmp

    • memory/1772-142-0x0000000000000000-mapping.dmp

    • memory/2488-149-0x00000000007B0000-0x0000000000CB8000-memory.dmp

      Filesize

      5.0MB

    • memory/2488-148-0x00000000007B0000-0x0000000000CB8000-memory.dmp

      Filesize

      5.0MB

    • memory/2488-147-0x00000000007B0000-0x0000000000CB8000-memory.dmp

      Filesize

      5.0MB

    • memory/2488-146-0x00000000007B0000-0x0000000000CB8000-memory.dmp

      Filesize

      5.0MB

    • memory/2488-143-0x0000000000000000-mapping.dmp

    • memory/2600-140-0x0000000000000000-mapping.dmp

    • memory/3464-141-0x00000000006F0000-0x0000000000BF8000-memory.dmp

      Filesize

      5.0MB

    • memory/3464-132-0x00000000006F0000-0x0000000000BF8000-memory.dmp

      Filesize

      5.0MB

    • memory/3464-137-0x0000000006EF0000-0x0000000006F56000-memory.dmp

      Filesize

      408KB

    • memory/3464-136-0x00000000066F0000-0x0000000006782000-memory.dmp

      Filesize

      584KB

    • memory/3464-135-0x00000000065B0000-0x0000000006600000-memory.dmp

      Filesize

      320KB

    • memory/3464-134-0x00000000068D0000-0x0000000006E74000-memory.dmp

      Filesize

      5.6MB

    • memory/3464-133-0x00000000006F0000-0x0000000000BF8000-memory.dmp

      Filesize

      5.0MB