Ransom_Win32_WannaCrypt

YARA detection rule by roadwy

Ransom:Win32/WannaCrypt,SIGNATURE_TYPE_PEHSTR_EXT,fffffffa 00 fffffffa 00 26 00 00

rule Ransom_Win32_WannaCrypt{
	meta:
		description = "Ransom:Win32/WannaCrypt,SIGNATURE_TYPE_PEHSTR_EXT,fffffffa 00 fffffffa 00 26 00 00 "
		
	strings :
		$a_80_0 = {57 61 6e 61 43 72 79 70 74 30 72 } 		$a_00_1 = {57 41 4e 41 43 52 59 21 } 		$a_00_2 = {69 63 61 63 6c 73 20 2e 20 2f 67 72 61 6e 74 20 45 76 65 72 79 6f 6e 65 } 		$a_00_3 = {61 74 74 72 69 62 20 2b 68 } 		$a_00_4 = {63 6d 64 2e 65 78 65 20 2f 63 } 		$a_80_5 = {2e 6c 61 79 36 } 		$a_80_6 = {2e 73 71 6c 69 74 65 33 } 		$a_80_7 = {2e 73 71 6c 69 74 65 64 62 } 		$a_80_8 = {2e 61 63 63 64 62 } 		$a_80_9 = {2e 6a 61 76 61 } 		$a_80_10 = {2e 63 6c 61 73 73 } 		$a_80_11 = {2e 6d 70 65 67 } 		$a_80_12 = {2e 64 6a 76 75 } 		$a_80_13 = {2e 74 69 66 66 } 		$a_80_14 = {2e 6a 70 65 67 } 		$a_80_15 = {2e 62 61 63 6b 75 70 } 		$a_80_16 = {2e 76 6d 64 6b } 		$a_80_17 = {2e 73 6c 64 6d } 		$a_80_18 = {2e 73 6c 64 78 } 		$a_80_19 = {2e 6f 6e 65 74 6f 63 32 } 		$a_80_20 = {2e 76 73 64 78 } 		$a_80_21 = {2e 70 6f 74 6d } 		$a_80_22 = {2e 70 6f 74 78 } 		$a_80_23 = {2e 70 70 61 6d } 		$a_80_24 = {2e 70 70 73 78 } 		$a_80_25 = {2e 70 70 73 6d } 		$a_80_26 = {2e 70 70 74 6d } 		$a_80_27 = {2e 70 70 74 78 } 		$a_80_28 = {2e 78 6c 74 6d } 		$a_80_29 = {2e 78 6c 74 78 } 		$a_80_30 = {2e 78 6c 73 62 } 		$a_80_31 = {2e 78 6c 73 6d } 		$a_80_32 = {2e 78 6c 73 78 } 		$a_80_33 = {2e 64 6f 74 78 } 		$a_80_34 = {2e 64 6f 74 6d } 		$a_80_35 = {2e 64 6f 63 6d } 		$a_80_36 = {2e 64 6f 63 62 } 		$a_80_37 = {2e 64 6f 63 78 } 	condition:
		((#a_80_0  & 1)*100+(#a_00_1  & 1)*100+(#a_00_2  & 1)*10+(#a_00_3  & 1)*10+(#a_00_4  & 1)*10+(#a_80_5  & 1)*1+(#a_80_6  & 1)*1+(#a_80_7  & 1)*1+(#a_80_8  & 1)*1+(#a_80_9  & 1)*1+(#a_80_10  & 1)*1+(#a_80_11  & 1)*1+(#a_80_12  & 1)*1+(#a_80_13  & 1)*1+(#a_80_14  & 1)*1+(#a_80_15  & 1)*1+(#a_80_16  & 1)*1+(#a_80_17  & 1)*1+(#a_80_18  & 1)*1+(#a_80_19  & 1)*1+(#a_80_20  & 1)*1+(#a_80_21  & 1)*1+(#a_80_22  & 1)*1+(#a_80_23  & 1)*1+(#a_80_24  & 1)*1+(#a_80_25  & 1)*1+(#a_80_26  & 1)*1+(#a_80_27  & 1)*1+(#a_80_28  & 1)*1+(#a_80_29  & 1)*1+(#a_80_30  & 1)*1+(#a_80_31  & 1)*1+(#a_80_32  & 1)*1+(#a_80_33  & 1)*1+(#a_80_34  & 1)*1+(#a_80_35  & 1)*1+(#a_80_36  & 1)*1+(#a_80_37  & 1)*1) >=250
 
}

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

114c9890-04ab-45cf-b640-e6141bb124ab

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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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