TrojanDownloader_O97M_Valak_YG_MTB

YARA detection rule by roadwy

TrojanDownloader:O97M/Valak.YG!MTB,SIGNATURE_TYPE_MACROHSTR_EXT,03 00 03 00 03 00 00

rule TrojanDownloader_O97M_Valak_YG_MTB{
	meta:
		description = "TrojanDownloader:O97M/Valak.YG!MTB,SIGNATURE_TYPE_MACROHSTR_EXT,03 00 03 00 03 00 00 "
		
	strings :
		$a_01_0 = {6d 61 73 20 3d 20 22 2f 25 39 31 31 25 39 31 31 25 39 31 31 25 39 31 31 25 39 31 31 40 6a 2e 6d 70 5c 6b 61 73 64 61 73 6a 61 73 6a 64 61 6f 73 6b 64 6f 6c 61 73 6d 64 6f 6b 6b 6f 61 73 64 64 73 64 73 6b 64 64 } 		$a_01_1 = {61 73 6d 64 69 61 73 64 20 3d 20 22 73 3a 2f } 		$a_01_2 = {61 73 6e 20 3d 20 6d 6f 61 73 64 20 2b 20 61 73 64 6d 6d 6d 20 2b 20 61 73 64 6d 6d 6d 20 2b 20 6d 77 69 6d 78 20 2b 20 61 73 6d 64 69 61 73 64 20 2b 20 6d 61 73 } 	condition:
		((#a_01_0  & 1)*1+(#a_01_1  & 1)*1+(#a_01_2  & 1)*1) >=3
 
}

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

298b05ae-dafc-4c1f-8ab1-77e49c5c60cb

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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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