TrojanDownloader_O97M_Obfuse_MS_MTB

YARA detection rule by roadwy

TrojanDownloader:O97M/Obfuse.MS!MTB,SIGNATURE_TYPE_MACROHSTR_EXT,05 00 05 00 05 00 00

rule TrojanDownloader_O97M_Obfuse_MS_MTB{
	meta:
		description = "TrojanDownloader:O97M/Obfuse.MS!MTB,SIGNATURE_TYPE_MACROHSTR_EXT,05 00 05 00 05 00 00 "
		
	strings :
		$a_03_0 = {3d 20 43 72 65 61 74 65 4f 62 6a 65 63 74 28 [0-35] 28 22 71 77 6c 68 6c 73 61 64 77 71 77 6c 68 6c 73 61 64 69 6e 6d 71 77 6c 68 6c 73 61 64 67 6d 71 77 6c 68 6c 73 61 64 74 73 3a 57 71 77 6c 68 6c 73 61 64 69 6e 33 71 77 6c 68 6c 73 61 64 32 5f 50 71 77 6c 68 6c 73 61 64 72 71 77 6c 68 6c 73 61 64 6f 63 65 71 77 6c 68 6c 73 61 64 73 73 71 77 6c 68 6c 73 61 64 22 29 29 } 		$a_03_1 = {2e 43 72 65 61 74 65 28 [0-38] 2c } 		$a_03_2 = {3d 20 52 65 70 6c 61 63 65 28 [0-35] 2c } 		$a_01_3 = {4d 53 46 6f 72 6d 73 2c 20 54 65 78 74 42 6f 78 22 } 		$a_01_4 = {2e 53 68 6f 77 57 69 6e 64 6f 77 20 3d } 	condition:
		((#a_03_0  & 1)*1+(#a_03_1  & 1)*1+(#a_03_2  & 1)*1+(#a_01_3  & 1)*1+(#a_01_4  & 1)*1) >=5
 
}

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

dbaf3626-bd61-484a-a901-3b62525267fe

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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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