Analysis

  • max time kernel
    165s
  • max time network
    177s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09/01/2024, 18:40

General

  • Target
    4e300f6a22ea95a0996d21ec44aef2ee.exe
  • Size 488KB
  • Sample240109-xa6d2shae8
  • SHA256 00168a69b2dbc620e6c16d5a3ae40639499085e4e0efc644f3d6cadfa3c8468e
  • MD5 SHA1 SHA512 SSDEEP

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 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.

  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 15 IoCs
  • Drops file in System32 directory 12 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 4 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 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 10 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\4e300f6a22ea95a0996d21ec44aef2ee.exe
    "C:\Users\Admin\AppData\Local\Temp\4e300f6a22ea95a0996d21ec44aef2ee.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2288
    • C:\Users\Admin\AppData\Local\Temp\4e300f6a22ea95a0996d21ec44aef2ee.exe
      "C:\Users\Admin\AppData\Local\Temp\4e300f6a22ea95a0996d21ec44aef2ee.exe"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • Drops file in System32 directory
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:372
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\x0Snkio2sU.bat"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3824
        • C:\Windows\system32\chcp.com
          chcp 65001
          4⤵
            PID:4952
          • C:\Windows\system32\w32tm.exe
            w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
            4⤵
              PID:5008
            • C:\odt\fontdrvhost.exe
              "C:\odt\fontdrvhost.exe"
              4⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:64
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Documents and Settings\System.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:400
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\System32\dbnetlib\backgroundTaskHost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2912
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "4e300f6a22ea95a0996d21ec44aef2ee" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\NUPNSVML-20231215-0947\4e300f6a22ea95a0996d21ec44aef2ee.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1812
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApi.ProxyStub\SearchApp.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:4032
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\PerfLogs\explorer.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2640
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Windows\System32\IpNatHlpClient\sihost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:5088
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\System32\WiFiConfigSP\backgroundTaskHost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:4488
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\NAPCRYPT\winlogon.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:4080
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft.NET\RedistList\fontdrvhost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:840
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\Common Files\microsoft shared\ClickToRun\ClientCapabilities\OfficeClickToRun.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3896
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\AppxManifest\SearchApp.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3612
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\odt\fontdrvhost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3964
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\unsecapp.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:4016
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\ndadmin\lsass.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 "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\fhevents\dllhost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3832

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            explorer.exe

            • Path C:\PerfLogs\explorer.exe
            • Size 488KB
            • SHA256 00168a69b2dbc620e6c16d5a3ae40639499085e4e0efc644f3d6cadfa3c8468e
            • MD5 SHA1 SHA512 SSDEEP

            4e300f6a22ea95a0996d21ec44aef2ee.exe.log

            • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\4e300f6a22ea95a0996d21ec44aef2ee.exe.log
            • Size 1KB
            • SHA256 46386a61f3aaf1b1c2e6efc9fc7e9e9ff16cd13ae58b8d856835771fedb6d457
            • MD5 SHA1 SHA512

            d3dd6fd8f0cfa2c102b7001f896ce6d910741ff12780b1711890d303b372bc37005010361d4c45e5

            • Path C:\Users\Admin\AppData\Local\Temp\d3dd6fd8f0cfa2c102b7001f896ce6d910741ff12780b1711890d303b372bc37005010361d4c45e5
            • Size 320B
            • SHA256 39dee84f9e60f23dcb82e2ab95db1cc5d155088bcae6a0ca0c9dc3fe289973f2
            • MD5 SHA1 SHA512

            x0Snkio2sU.bat

            • Path C:\Users\Admin\AppData\Local\Temp\x0Snkio2sU.bat
            • Size 238B
            • SHA256 0e434db94586a2c62ac54a882ec11d1456ded7ede5323a94b532e24155698711
            • MD5 SHA1 SHA512

            memory/64-55-0x00007FF996FD0000-0x00007FF997A91000-memory.dmp

            memory/64-53-0x000000001B5A0000-0x000000001B5B0000-memory.dmp

            memory/64-52-0x00007FF996FD0000-0x00007FF997A91000-memory.dmp

            memory/372-28-0x00007FF997400000-0x00007FF997EC1000-memory.dmp

            memory/372-30-0x000000001B9B0000-0x000000001B9C0000-memory.dmp

            memory/372-47-0x00007FF997400000-0x00007FF997EC1000-memory.dmp

            memory/2288-21-0x00007FF997400000-0x00007FF997EC1000-memory.dmp

            memory/2288-31-0x00007FF997400000-0x00007FF997EC1000-memory.dmp

            memory/2288-27-0x000000001AFA0000-0x000000001AFB0000-memory.dmp

            memory/2288-0-0x0000000000340000-0x00000000003C0000-memory.dmp

            memory/2288-2-0x000000001AFA0000-0x000000001AFB0000-memory.dmp

            memory/2288-1-0x00007FF997400000-0x00007FF997EC1000-memory.dmp