Elastic medium stable eql

Suspicious Service was Installed in the System

Identifies the creation of a new Windows service with a suspicious service name or command value. Windows services typically run as SYSTEM and can be used for privilege escalation and persistence.

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Detection Logic

any where host.os.type == "windows" and
(
  (
    event.code : "4697" and
    (
      (
        (
          winlog.event_data.ServiceFileName : (
            "*COMSPEC*", "*\\127.0.0.1*", "*Admin$*", "*powershell*", "*rundll32*", "*cmd.exe*",
            "*echo*", "*RemComSvc*", "*.bat*", "*.cmd*", "*certutil*", "*vssadmin*", "*certmgr*", "*bitsadmin*",
            "*\\Users\\*", "*\\Windows\\Tasks\\*", "*\\PerfLogs\\*", "*\\Windows\\Debug\\*",
            "*regsvr32*", "*msbuild*", "*winexesvc.exe*", "*DumpSvc.exe*", "*pwsh.exe*", "*PAExec*"
          ) or
          winlog.event_data.ServiceFileName regex~ """%systemroot%\\[a-z0-9]+\.exe"""
        ) and
        not winlog.event_data.ServiceFileName: (
              "%SystemRoot%\\PSEXESVC.exe", "%SystemRoot%\\\\RemComSvc.exe",
              "%SystemRoot%\\pbpsdeploy.exe", "%SystemRoot%\\system32\\RemComSvc.exe",
              "\"C:\\Program Files\\Common Files\\Zoom\\Support\\CptService.exe*",
              "\"C:\\Program Files\\Common Files\\ZoomVDIPluginManagement\\Support\\CptService.exe*",
              "\"C:\\Program Files (x86)\\CheckPoint\\Endpoint Security\\EFR\\host\\cpsechost.exe\" service"
        )
      ) or
      winlog.event_data.ServiceName : (
         "mssecsvc2.0", "WCESERVICE*", "WCE SERVICE*", "pwdump*", "gsecdump*", "cachedump*"
      )
    )
  ) or
  (
    event.code : "7045" and
    (
      (
        winlog.event_data.ImagePath : (
          "*COMSPEC*", "*\\127.0.0.1*", "*Admin$*", "*powershell*", "*rundll32*", "*cmd.exe*",
          "*echo*", "*.bat*", "*.cmd*", "*certutil*", "*vssadmin*", "*certmgr*", "*bitsadmin*",
          "*\\Users\\*", "*\\Windows\\Tasks\\*", "*\\PerfLogs\\*", "*\\Windows\\Debug\\*",
          "*regsvr32*", "*msbuild*", "*winexesvc.exe*", "*DumpSvc.exe*", "*pwsh.exe*", "*PAExec*"
        ) and
        not winlog.event_data.ImagePath : (
              "%SystemRoot%\\PSEXESVC.exe", "%SystemRoot%\\\\RemComSvc.exe",
              "%SystemRoot%\\pbpsdeploy.exe", "%SystemRoot%\\system32\\RemComSvc.exe",
              "\"C:\\Program Files\\Common Files\\Zoom\\Support\\CptService.exe*",
              "\"C:\\Program Files\\Common Files\\ZoomVDIPluginManagement\\Support\\CptService.exe*",
              "\"C:\\Program Files (x86)\\CheckPoint\\Endpoint Security\\EFR\\host\\cpsechost.exe\" service"
        )
      ) or
      winlog.event_data.ServiceName : (
         "mssecsvc2.0", "WCESERVICE*", "WCE SERVICE*", "pwdump*", "gsecdump*", "cachedump*"
      )
    )
  )
)

Field Validations

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