Ransom_MSIL_Cryptolocker_EM_MTB

YARA detection rule by roadwy

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

rule Ransom_MSIL_Cryptolocker_EM_MTB{
	meta:
		description = "Ransom:MSIL/Cryptolocker.EM!MTB,SIGNATURE_TYPE_PEHSTR_EXT,4a 00 4a 00 0c 00 00 "
		
	strings :
		$a_81_0 = {57 68 61 74 20 63 61 6e 20 49 20 64 6f 20 74 6f 20 67 65 74 20 6d 79 20 66 69 6c 65 73 20 62 61 63 6b } 		$a_81_1 = {59 6f 75 20 70 65 72 73 6f 6e 61 6c 20 66 69 6c 65 73 20 61 72 65 20 65 6e 63 72 79 70 74 65 64 } 		$a_81_2 = {59 6f 75 72 20 69 6d 70 6f 72 74 61 6e 74 20 66 69 6c 65 73 20 76 69 64 65 6f 73 2c 20 6d 75 73 69 63 2c 20 69 6d 61 67 65 73 2c 20 64 6f 63 75 6d 65 6e 74 73 20 2e 2e 2e 20 65 74 63 20 61 72 65 20 65 6e 63 72 79 70 74 65 64 20 77 69 74 68 20 65 6e 63 72 79 70 74 69 6f 6e } 		$a_81_3 = {44 45 43 52 59 50 54 59 4f 55 52 46 49 4c 45 53 } 		$a_81_4 = {40 70 72 6f 74 6f 6e 6d 61 69 6c 2e 63 6f 6d } 		$a_81_5 = {62 69 74 63 6f 69 6e 20 61 64 64 72 65 73 73 } 		$a_81_6 = {76 73 73 61 64 6d 69 6e 20 64 65 6c 65 74 65 20 73 68 61 64 6f 77 73 20 2f 61 6c 6c 20 2f 71 75 69 65 74 } 		$a_81_7 = {44 69 73 61 62 6c 65 54 61 73 6b 4d 67 72 } 		$a_81_8 = {2e 66 75 63 6b 69 6e 67 } 		$a_81_9 = {42 69 74 63 6f 69 6e 20 41 64 64 72 65 73 73 3a } 		$a_81_10 = {57 6e 43 72 79 } 		$a_81_11 = {72 61 6e 73 6f 6d 2e 6a 70 67 } 	condition:
		((#a_81_0  & 1)*50+(#a_81_1  & 1)*50+(#a_81_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 ]]

7c2ef08f-03c6-4fa5-8b03-8a4918f9947a

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