Parent Process PID Spoofing

/* This rule is compatible with Elastic Endpoint only */ sequence by
host.id, user.id with maxspan=5m [process where event.type == "start"
and process.Ext.token.integrity_level_name != "system" and (
process.pe.original_file_name : ("winword.exe", "excel.exe",
"outlook.exe", "powerpnt.exe", "eqnedt32.exe",
"fltldr.exe", "mspub.exe", "msaccess.exe", "powershell.exe",
"pwsh.exe", "cscript.exe",
"wscript.exe", "rundll32.exe", "regsvr32.exe", "msbuild.exe",
"mshta.exe", "wmic.exe", "cmstp.exe", "msxsl.exe") or
process.executable : ("?:\\Users\\*.exe",
"?:\\ProgramData\\*.exe",
"?:\\Windows\\Microsoft.NET\\*.exe",
"?:\\Windows\\Temp\\*.exe",
"?:\\Windows\\Tasks\\*") or process.code_signature.trusted != true
) ] by process.pid [process where event.type == "start" and
process.parent.Ext.real.pid > 0 and /* process.parent.Ext.real.pid
is only populated if the parent process pid doesn't match */ not
(process.name : "msedge.exe" and process.parent.name : "sihost.exe")
] by process.parent.Ext.real.pid