topic Re: Correlation Rule for services in Cortex XDR Discussions

Correlation Rule for services

NathanBradley — Fri, 01 Jul 2022 15:38:44 GMT

Is it possible to create a correlation rule to identify when new services are present on an endpoint

For example,

Create a correlation rule ,using a query that returns all services on an endpoint, that creates a new data set of the results..say there are 201 services

Create a rule that then alarms when either a new service is present or just when the result is greater than 201

Re: Correlation Rule for services

bbucao — Fri, 01 Jul 2022 19:59:58 GMT

Hi @NathanBradley,

Using the Cortex XDR Forensics add-on you could enable the collection of services via the Agent Settings Profile, that data can then be queried in XQL using the dataset forensics_services, you could then craft a correlation rule against that dataset to get the outcome you want.
Another way would be via the Host Insights add-on you could retrieve a list of services for a given endpoint, but this data is not currently exposed in XQL so you would have to export from the UI and would not be able to build a correlation rule against it.

Regards,

Ben

Re: Correlation Rule for services

NathanBradley — Fri, 08 Jul 2022 17:37:57 GMT

I can currently query and get a list of services using xql

Using that query im building a correlation rule to save to a new dataset

Im stuck on how to build a new rule to alert when a service has been added

config case_sensitive = false
| dataset = host_inventory
| filter services != null
| arrayexpand services
| alter Display_Name=json_extract(services, "$.display_name")
| alter Path_Name=json_extract(services, "$.path_name")
| alter Service_Name=json_extract(services, "$.service_name")
| alter UserName=json_extract(services, "$.start_user_name")
| alter Start_Mode=json_extract(services, "$.start_mode")
| alter Started=json_extract(services, "$.started")
| alter State=json_extract(services, "$.state")
| alter Service_Type=json_extract(services, "$.service_type")
| alter Accept_Pause=json_extract(services, "$.accept_pause")
| alter Accept_Stop=json_extract(services, "$.accept_stop")
| alter Delayed=json_extract(services, "$.delayed")
| alter Desktop_Interact=json_extract(services, "$.desktop_interact")
| alter state = replace(replace(replace(replace(replace(replace(replace(state, "1", "Start_Pending"),"2", "Stop_Pending"), "3", "Running"), "4", "Continue_Pending"), "5", "Pause_Pending"), "6", "Paused"), "0", "Stopped")
| alter start_mode = replace(replace(replace(replace(replace(start_mode, "4", "Disabled"),"2", "Automatic"),"0", "Boot"),"1", "System,"),"3", "Manual")
| fields host_name,Display_Name,Service_Name,Path_Name,UserName,Start_Mode,Started,Service_Type,state,Accept_Pause,Accept_Stop, Delayed, Desktop_Interact
| sort asc Display_Name
| filter (host_name contains """NameofHost""")