Linux_Worm_ORCSHRED

YARA detection rule by mmuir@cadosecurity.com · Apache License 2.0

Detects ORCSHRED worm used in attacks on Ukrainian ICS

rule Linux_Worm_ORCSHRED : hardened
{
	meta:
		description = "Detects ORCSHRED worm used in attacks on Ukrainian ICS"
		author = "mmuir@cadosecurity.com"
		date = "2022-04-12"
		license = "Apache License 2.0"
		hash = "43d07f28b7b699f43abd4f695596c15a90d772bfbd6029c8ee7bc5859c2b0861"
		score = 60

	strings:
		$a = {69 73 5f 6f 77 6e 65 72}
		$b = {53 74 61 72 74 20 6d 6f 73 74 20 73 65 63 75 72 69 74 79 20 6d 6f 64 65 21}
		$c = {63 68 65 63 6b 5f 73 6f 6c 61 72 69 73}
		$d = {77 73 6f 6c 2e 73 68}
		$e = {77 6f 62 66 2e 73 68}
		$f = {64 69 73 6f 77 6e}
		$g = {2f 76 61 72 2f 6c 6f 67 2f 74 61 73 6b 73}

	condition:
		4 of them
}

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

215f6ef6-040a-4868-8973-62e5c1b331c8

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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 ]]

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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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