Ransom_MSIL_Cryptolocker_DN_MTB

YARA detection rule by roadwy

Ransom:MSIL/Cryptolocker.DN!MTB,SIGNATURE_TYPE_PEHSTR_EXT,42 00 42 00 0c 00 00

rule Ransom_MSIL_Cryptolocker_DN_MTB{
	meta:
		description = "Ransom:MSIL/Cryptolocker.DN!MTB,SIGNATURE_TYPE_PEHSTR_EXT,42 00 42 00 0c 00 00 "
		
	strings :
		$a_81_0 = {53 41 59 47 4f 4f 44 42 59 45 2e 65 78 65 } 		$a_81_1 = {53 68 65 6c 6c 4c 6f 63 6b 65 72 } 		$a_81_2 = {5f 5f 5f 52 45 43 4f 56 45 52 5f 5f 46 49 4c 45 53 5f 5f 2e 68 65 61 72 74 2e 74 78 74 } 		$a_81_3 = {59 4f 55 52 20 46 49 4c 45 53 20 48 41 56 45 20 42 45 45 4e 20 20 45 4e 43 52 59 50 54 45 44 } 		$a_81_4 = {2e 6b 61 6e 6d 61 6e 69 } 		$a_81_5 = {5c 48 65 61 72 74 62 65 61 74 5c 6b 65 79 73 2e 6a 73 6f 6e } 		$a_81_6 = {45 6e 63 72 79 70 74 46 69 6c 65 73 } 		$a_81_7 = {65 6e 63 72 79 70 74 46 69 6c 65 } 		$a_81_8 = {45 6e 63 72 79 70 74 65 64 20 46 69 6c 65 73 20 43 6f 75 6e 74 3a } 		$a_81_9 = {42 6c 61 63 6b 20 43 61 74 } 		$a_81_10 = {63 72 79 70 74 31 35 } 		$a_81_11 = {42 54 43 20 61 64 64 72 65 73 73 3a } 	condition:
		((#a_81_0  & 1)*50+(#a_81_1  & 1)*50+(#a_81_2  & 1)*50+(#a_81_3  & 1)*10+(#a_81_4  & 1)*10+(#a_81_5  & 1)*10+(#a_81_6  & 1)*5+(#a_81_7  & 1)*5+(#a_81_8  & 1)*5+(#a_81_9  & 1)*1+(#a_81_10  & 1)*1+(#a_81_11  & 1)*1) >=66
 
}

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

9c5c9bb7-1a5a-41c1-bd37-8fd4efcd38d4

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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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