splApache-2.0from splunk/security_content

Suspicious SearchProtocolHost no Command Line Arguments

The following analytic detects instances of searchprotocolhost.exe running without command line arguments. This behavior is unusual and often associated with malicious activities, such as those performed by Cobalt Strike. The detection leverages Endpoint Detection and Response (EDR) telemetry, focusing on process execution data. This activity is significant because searchprotocolhost.exe typically runs with specific arguments, and its absence may indicate an attempt to evade detection. If confirmed malicious, this could lead to unauthorized code execution, potential credential dumping, or other malicious actions within the environment.

Quality

FP risk

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Rule sourcedetections/endpoint/suspicious_searchprotocolhost_no_command_line_arguments.yml

| tstats `security_content_summariesonly`
  count min(_time) as firstTime
        max(_time) as lastTime

FROM datamodel=Endpoint.Processes WHERE

(
    Processes.process_name=searchprotocolhost.exe
    OR
    Processes.original_file_name=searchprotocolhost.exe
)
Processes.process IN ("*searchprotocolhost","*searchprotocolhost.exe", "*searchprotocolhost.exe\"")

BY Processes.action Processes.dest Processes.original_file_name
   Processes.parent_process Processes.parent_process_exec
   Processes.parent_process_guid Processes.parent_process_id
   Processes.parent_process_name Processes.parent_process_path
   Processes.process Processes.process_exec Processes.process_guid
   Processes.process_hash Processes.process_id Processes.process_integrity_level
   Processes.process_name Processes.process_path Processes.user
   Processes.user_id Processes.vendor_product

| `drop_dm_object_name(Processes)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `suspicious_searchprotocolhost_no_command_line_arguments_filter`