MAL_AsyncRAT_Config_Decryption

YARA detection rule by SECUINFRA Falcon Team

Detects AsnycRAT based on it's config decryption routine

import "pe"
rule MAL_AsyncRAT_Config_Decryption : rat malware asyncrat {
	meta:
		author = "SECUINFRA Falcon Team"
		date = "27.02.2022"
		description = "Detects AsnycRAT based on it's config decryption routine"

	strings:
		$config_decryption = { 7E [4] 6F [4] 80 [4] 7E [4] 7E [4] 6F [4] 80 [4] 7E [4] 7E [4] 6F [4] 80 [4] 7E }

	condition:
		uint16(0) == 0x5a4d
		and filesize < 200KB
		and pe.imports("mscoree.dll")
		and $config_decryption
}

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

12922fc1-a45b-46a6-a482-6b9290318c0c

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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

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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.

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

[[ currentRule.title ]]

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