rfc9424v4.txt		rfc9424.txt
	Internet Engineering Task Force (IETF) K. Paine		Internet Engineering Task Force (IETF) K. Paine
	Request for Comments: 9424 Splunk Inc.		Request for Comments: 9424 Splunk Inc.
	Category: Informational O. Whitehouse		Category: Informational O. Whitehouse
	ISSN: 2070-1721 Binary Firefly		ISSN: 2070-1721 Binary Firefly
	J. Sellwood		J. Sellwood
	A. Shaw		A. Shaw
	UK National Cyber Security Centre		UK National Cyber Security Centre
	June 2023		August 2023
	Indicators of Compromise (IoCs) and Their Role in Attack Defence		Indicators of Compromise (IoCs) and Their Role in Attack Defence
	Abstract		Abstract
	Cyber defenders frequently rely on Indicators of Compromise (IoCs) to		Cyber defenders frequently rely on Indicators of Compromise (IoCs) to
	identify, trace, and block malicious activity in networks or on		identify, trace, and block malicious activity in networks or on
	endpoints. This document reviews the fundamentals, opportunities,		endpoints. This document reviews the fundamentals, opportunities,
	operational limitations, and recommendations for IoC use. It		operational limitations, and recommendations for IoC use. It
	highlights the need for IoCs to be detectable in implementations of		highlights the need for IoCs to be detectable in implementations of
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