Elastic medium stable eql

Uncommon Registry Persistence Change

Detects changes to registry persistence keys that are not commonly used or modified by legitimate programs. This could be an indication of an adversary's attempt to persist in a stealthy manner.

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Detection Logic

registry where host.os.type == "windows" and event.type == "change" and
 length(registry.data.strings) > 0 and
 registry.path : (
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Terminal Server\\Install\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run\\*",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Terminal Server\\Install\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Runonce\\*",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Windows\\Load",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Windows\\Run",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Windows\\IconServiceLib",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Shell",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Shell",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\AppSetup",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Taskman",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Userinit",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\VmApplet",
      "HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run\\*",
      "HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\\Shell",
      "HKLM\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Logoff\\Script",
      "HKLM\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Logon\\Script",
      "HKLM\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Shutdown\\Script",
      "HKLM\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Startup\\Script",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run\\*",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\\Shell",
      "HKEY_USERS\\*\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Logoff\\Script",
      "HKEY_USERS\\*\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Logon\\Script",
      "HKEY_USERS\\*\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Shutdown\\Script",
      "HKEY_USERS\\*\\SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Scripts\\Startup\\Script",
      "HKLM\\SOFTWARE\\Microsoft\\Active Setup\\Installed Components\\*\\ShellComponent",
      "HKLM\\SOFTWARE\\Microsoft\\Windows CE Services\\AutoStartOnConnect\\MicrosoftActiveSync",
      "HKLM\\SOFTWARE\\Microsoft\\Windows CE Services\\AutoStartOnDisconnect\\MicrosoftActiveSync",
      "HKLM\\SOFTWARE\\Microsoft\\Ctf\\LangBarAddin\\*\\FilePath",
      "HKLM\\SOFTWARE\\Microsoft\\Internet Explorer\\Extensions\\*\\Exec",
      "HKLM\\SOFTWARE\\Microsoft\\Internet Explorer\\Extensions\\*\\Script",
      "HKLM\\SOFTWARE\\Microsoft\\Command Processor\\Autorun",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Ctf\\LangBarAddin\\*\\FilePath",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Internet Explorer\\Extensions\\*\\Exec",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Internet Explorer\\Extensions\\*\\Script",
      "HKEY_USERS\\*\\SOFTWARE\\Microsoft\\Command Processor\\Autorun",
      "HKEY_USERS\\*\\Control Panel\\Desktop\\scrnsave.exe",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Image File Execution Options\\*\\VerifierDlls",
      "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\GpExtensions\\*\\DllName",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\SafeBoot\\AlternateShell",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Terminal Server\\Wds\\rdpwd\\StartupPrograms",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Terminal Server\\WinStations\\RDP-Tcp\\InitialProgram",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Session Manager\\BootExecute",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Session Manager\\BootExecuteNoPnpSync",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Session Manager\\SetupExecute",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Session Manager\\SetupExecuteNoPnpSync",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Session Manager\\PlatformExecute",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Session Manager\\Execute",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\Session Manager\\S0InitialCommand",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\ServiceControlManagerExtension",
      "HKLM\\SYSTEM\\ControlSet*\\Control\\BootVerificationProgram\\ImagePath",
      "HKLM\\SYSTEM\\Setup\\CmdLine",
      "HKEY_USERS\\*\\Environment\\UserInitMprLogonScript") and

 not registry.data.strings : ("C:\\Windows\\system32\\userinit.exe", "cmd.exe", "C:\\Program Files (x86)\\*.exe",
                              "C:\\Program Files\\*.exe") and
 not (process.name : "rundll32.exe" and registry.path : "*\\Software\\Microsoft\\Internet Explorer\\Extensions\\*\\Script") and
 not process.executable : ("C:\\Windows\\System32\\msiexec.exe",
                           "C:\\Windows\\SysWOW64\\msiexec.exe",
                           "C:\\ProgramData\\Microsoft\\Windows Defender\\Platform\\*\\MsMpEng.exe",
                           "C:\\Program Files\\*.exe",
                           "C:\\Program Files (x86)\\*.exe") and
 not (process.name : ("TiWorker.exe", "poqexec.exe") and registry.value : "SetupExecute" and
      registry.data.strings : (
        "C:\\windows\\System32\\poqexec.exe /display_progress \\SystemRoot\\WinSxS\\pending.xml",
        "C:\\Windows\\System32\\poqexec.exe /skip_critical_poq /display_progress \\SystemRoot\\WinSxS\\pending.xml"
      )
     ) and
 not (process.name : "svchost.exe" and registry.value : "SCRNSAVE.EXE" and
      registry.data.strings : (
        "%windir%\\system32\\rundll32.exe user32.dll,LockWorkStation",
        "scrnsave.scr",
        "%windir%\\system32\\Ribbons.scr"
      )
     )

Field Validations

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