BIOCs (Behavioral Indicators of Compromise) are the correct mechanism for detecting and blocking specific behaviors in Cortex XDR. Unlike hash-based or signature-based detection, BIOCs match on behavioral patterns (process activity, file operations, network connections, registry changes, etc.).
To move from detection to prevention (blocking), the BIOC must be added to a profile that supports enforcement - and the Exploit Security Profile is the correct profile type for housing custom BIOCs with a block action. When a BIOC with a block action is added to an Exploit profile and that profile is applied via a policy, matching behavior will be actively prevented.