HUNT_nopsled_32

YARA detection rule by @petermstewart · GPL-2.0

Matches 32 repeated no-operation hex bytes - 0x90

rule HUNT_nopsled_32 {
	meta:
		description = "Matches 32 repeated no-operation hex bytes - 0x90"
		last_modified = "2024-02-18"
		author = "@petermstewart"
		DaysofYara = "49/100"

	strings:
		$a = { 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 }

	condition:
		filesize < 5MB and
		$a
}

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

d8e6f9c5-8b63-43ca-94ac-0ac233e85495

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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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