Ransom_MSIL_Cryptolocker_DV_MTB

YARA detection rule by roadwy

Ransom:MSIL/Cryptolocker.DV!MTB,SIGNATURE_TYPE_PEHSTR_EXT,4a 00 4a 00 10 00 00

rule Ransom_MSIL_Cryptolocker_DV_MTB{
	meta:
		description = "Ransom:MSIL/Cryptolocker.DV!MTB,SIGNATURE_TYPE_PEHSTR_EXT,4a 00 4a 00 10 00 00 "
		
	strings :
		$a_81_0 = {44 69 73 63 6f 52 61 6e 73 6f 6d 77 61 72 65 } 		$a_81_1 = {76 78 43 72 79 70 74 65 72 } 		$a_81_2 = {52 75 6e 63 6f 75 6e 74 2e 63 72 79 } 		$a_81_3 = {68 69 64 64 65 6e 20 74 65 61 72 } 		$a_81_4 = {63 68 65 63 6b 69 70 2e 64 79 6e 64 6e 73 2e 6f 72 67 } 		$a_81_5 = {41 4c 4c 20 59 4f 55 52 20 46 49 4c 45 53 20 41 52 45 20 45 4e 43 52 59 50 54 45 44 } 		$a_81_6 = {48 6f 77 20 54 6f 20 44 65 63 72 79 70 74 20 4d 79 20 46 69 6c 65 73 } 		$a_81_7 = {69 5f 61 6d 5f 61 5f 64 6f 6c 70 68 69 6e } 		$a_81_8 = {44 69 73 61 62 6c 65 54 61 73 6b 4d 67 72 } 		$a_81_9 = {44 65 63 72 79 70 74 20 66 69 6c 65 73 } 		$a_81_10 = {44 65 74 65 63 74 53 61 6e 64 62 6f 78 69 65 } 		$a_81_11 = {2e 64 6f 6c 70 68 69 6e } 		$a_81_12 = {65 6e 63 72 79 70 74 } 		$a_81_13 = {4c 6f 63 6b 65 64 } 		$a_81_14 = {44 65 74 65 63 74 44 65 62 75 67 67 65 72 } 		$a_81_15 = {72 61 6e 73 6f 6d 77 61 72 65 } 	condition:
		((#a_81_0  & 1)*50+(#a_81_1  & 1)*50+(#a_81_2  & 1)*50+(#a_81_3  & 1)*50+(#a_81_4  & 1)*20+(#a_81_5  & 1)*20+(#a_81_6  & 1)*20+(#a_81_7  & 1)*20+(#a_81_8  & 1)*3+(#a_81_9  & 1)*3+(#a_81_10  & 1)*3+(#a_81_11  & 1)*3+(#a_81_12  & 1)*1+(#a_81_13  & 1)*1+(#a_81_14  & 1)*1+(#a_81_15  & 1)*1) >=74
 
}

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

446b65e3-5fb4-413f-af26-aa68a7456e46

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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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