SUSP_EXE_in_ISO

YARA detection rule by SECUINFRA Falcon Team

Detects ISO files that contains an Exe file. Does not need to be malicious

rule SUSP_EXE_in_ISO: EXE ISO {
	meta:
		author = "SECUINFRA Falcon Team"
		description = "Detects ISO files that contains an Exe file. Does not need to be malicious"
		date = "19.02.2022"
		reference = "Internal Research"

	strings:
		$magic = { 43 44 30 30 31 }
		$mz = { 4D 5A }

	condition:
		filesize > 100KB 
		and filesize < 800KB 
		and $magic 
		and $mz
}

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

617f327a-0384-4693-b1b9-e453005fe927

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

[[ reason ]]

What does this mean?

Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

What do these messages mean?

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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