TrojanDropper_O97M_GraceWire_BC_MTB

YARA detection rule by roadwy

TrojanDropper:O97M/GraceWire.BC!MTB,SIGNATURE_TYPE_MACROHSTR_EXT,05 00 05 00 05 00 00

rule TrojanDropper_O97M_GraceWire_BC_MTB{
	meta:
		description = "TrojanDropper:O97M/GraceWire.BC!MTB,SIGNATURE_TYPE_MACROHSTR_EXT,05 00 05 00 05 00 00 "
		
	strings :
		$a_03_0 = {6f 66 62 6c 20 3d 20 55 73 65 72 46 6f 72 6d 36 2e 54 65 78 74 42 6f 78 33 2e 54 61 67 20 2b 20 22 5c [0-10] 2e 64 6c 6c 22 } 		$a_03_1 = {3d 20 4a 6f 69 6e 28 41 72 72 61 79 28 55 73 65 72 46 6f 72 6d 36 2e 54 65 78 74 42 6f 78 31 2e 54 61 67 2c 20 22 5c [0-10] 2e 78 6c 73 } 		$a_03_2 = {3d 20 4a 6f 69 6e 28 41 72 72 61 79 28 [0-10] 2c 20 55 73 65 72 46 6f 72 6d 36 2e 54 65 78 74 42 6f 78 33 2e 56 61 6c 75 65 29 2c 20 22 22 29 } 		$a_01_3 = {6f 66 62 6c 20 3d 20 22 43 41 4c 4c 28 22 22 22 20 2b 20 6f 66 62 6c } 		$a_03_4 = {3d 20 55 73 65 72 46 6f 72 6d 36 2e 54 65 78 74 42 6f 78 31 2e 54 61 67 [0-08] 44 69 6d 20 6f 66 62 6c 20 41 73 20 53 74 72 69 6e 67 } 	condition:
		((#a_03_0  & 1)*1+(#a_03_1  & 1)*1+(#a_03_2  & 1)*1+(#a_01_3  & 1)*1+(#a_03_4  & 1)*1) >=5
 
}

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

a204e13b-ca14-4615-a4c9-580d15940230

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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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