ConfuserEx_Packer

YARA detection rule by Jonathan Peters · NOASSERTION

ConfuserEx Packer

rule ConfuserEx_Packer : suspicious
{
	meta:
		name = "ConfuserEx"
		category = "obfuscation"
		description = "ConfuserEx Packer"
		author = "Jonathan Peters"
		created = "2024-01-09"
		reliability = 90
	strings:
		$s1 = "GCHandle" ascii
		$s2 = "GCHandleType" ascii

		$op1 = { 5A 20 89 C0 3F 14 6A 5E [8-20] 5A 20 FB 56 4D 44 6A 5E 6D 9E }
		$op2 = { 20 61 FF 6F 00 13 ?? 06 13 ?? 16 13 [10-20] 20 1F 3F 5E 00 5A }
		$op3 = { 16 91 7E [3] 04 17 91 1E 62 60 7E [3] 04 18 91 1F 10 62 60 7E [3] 04 19 91 1F 18 62 }
	condition:
		uint16(0) == 0x5a4d and
		all of ($s*) and
		2 of ($op*)
}

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

a1c2fd46-7f66-4f5e-8d28-a0e99891e05a

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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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