Ransom_MSIL_Cryptolocker_EK_MTB

YARA detection rule by roadwy

Ransom:MSIL/Cryptolocker.EK!MTB,SIGNATURE_TYPE_PEHSTR_EXT,4a 00 4a 00 0c 00 00

rule Ransom_MSIL_Cryptolocker_EK_MTB{
	meta:
		description = "Ransom:MSIL/Cryptolocker.EK!MTB,SIGNATURE_TYPE_PEHSTR_EXT,4a 00 4a 00 0c 00 00 "
		
	strings :
		$a_81_0 = {59 6f 75 72 20 66 69 6c 65 73 20 28 63 6f 75 6e 74 3a 20 6e 29 20 68 61 76 65 20 62 65 65 6e 20 65 6e 63 72 79 70 74 65 64 } 		$a_81_1 = {4c 65 67 69 6f 6e 4c 6f 63 6b 65 72 34 } 		$a_03_2 = {4e 69 74 72 6f 52 61 6e 73 6f 6d 77 61 72 65 2e [0-05] 2e 72 65 73 6f 75 72 63 65 73 } 		$a_81_3 = {2e 46 61 6e 63 79 4c 65 61 6b 73 } 		$a_81_4 = {62 79 74 65 73 54 6f 42 65 45 6e 63 72 79 70 74 65 64 } 		$a_81_5 = {44 69 73 63 6f 72 64 20 4e 69 74 72 6f } 		$a_81_6 = {46 61 6e 63 79 4c 6f 63 6b 65 72 } 		$a_81_7 = {4c 65 67 69 6f 6e 4c 6f 63 6b 65 72 34 2e 5f 30 } 		$a_81_8 = {44 69 73 63 6f 72 64 20 46 72 65 65 20 4e 69 74 72 6f } 		$a_81_9 = {4e 6f 20 66 69 6c 65 73 20 74 6f 20 65 6e 63 72 79 70 74 } 		$a_81_10 = {70 61 73 73 77 6f 72 64 42 79 74 65 73 } 		$a_81_11 = {43 6f 6e 66 75 73 65 72 45 78 } 	condition:
		((#a_81_0  & 1)*50+(#a_81_1  & 1)*50+(#a_03_2  & 1)*50+(#a_81_3  & 1)*20+(#a_81_4  & 1)*20+(#a_81_5  & 1)*20+(#a_81_6  & 1)*3+(#a_81_7  & 1)*3+(#a_81_8  & 1)*3+(#a_81_9  & 1)*1+(#a_81_10  & 1)*1+(#a_81_11  & 1)*1) >=74
 
}

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

0fd2b1ea-dec3-42ad-846c-dea149f5b2a0

Propose edits, view related rules, and engage with the community through comments.

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 ]]

Community Discussion