Worm_Win32_Muhu_B

YARA detection rule by roadwy

Worm:Win32/Muhu.B,SIGNATURE_TYPE_PEHSTR,05 00 04 00 0c 00 00

rule Worm_Win32_Muhu_B{
	meta:
		description = "Worm:Win32/Muhu.B,SIGNATURE_TYPE_PEHSTR,05 00 04 00 0c 00 00 "
		
	strings :
		$a_01_0 = {72 65 70 72 6f 64 75 63 65 3a } 		$a_01_1 = {46 69 6c 65 43 6f 70 79 64 69 72 2c 43 3a 5c 6e 74 64 65 74 65 63 31 5c 63 68 69 6c 64 2c 25 65 6c 65 6d 65 6e 74 25 3a 5c 2c 31 } 		$a_01_2 = {52 65 67 77 72 69 74 65 2c 52 45 47 5f 53 5a 2c 48 4b 45 59 5f 4c 4f 43 41 4c 5f 4d 41 43 48 49 4e 45 2c 53 4f 46 54 57 41 52 45 5c 4d 69 63 72 6f 73 6f 66 74 5c 57 69 6e 64 6f 77 73 5c 43 75 72 72 65 6e 74 56 65 72 73 69 6f 6e 5c 70 6f 6c 69 63 69 65 73 5c 45 78 70 6c 6f 72 65 72 5c 52 75 6e 2c 77 69 6e 6c 6f 67 6f 6e 2c 43 3a 5c 6e 74 64 65 74 65 63 31 5c 72 75 6e 2e 65 78 65 } 		$a_01_3 = {4c 6f 6f 70 2c 20 52 65 61 64 2c 43 3a 5c 6e 74 64 65 74 65 63 31 5c 64 72 69 76 65 4c 69 73 74 2e 74 78 74 } 		$a_01_4 = {74 73 6b 63 6c 6f 73 65 3a 0d 0a 49 66 57 69 6e 45 78 69 73 74 2c 57 69 6e 64 6f 77 73 20 54 61 73 6b 20 4d 61 6e 61 67 65 72 0d 0a 20 20 7b 0d 0a 20 20 20 77 69 6e 63 6c 6f 73 65 } 		$a_01_5 = {57 69 6e 47 65 74 41 63 74 69 76 65 54 69 74 6c 65 2c 20 65 64 0d 0a 20 69 66 69 6e 73 74 72 69 6e 67 2c 65 64 2c 70 72 6f 63 65 73 73 20 65 78 70 6c 6f 72 65 72 0d 0a 20 20 7b 0d 0a 20 20 20 77 69 6e 63 6c 6f 73 65 20 25 65 64 25 } 		$a_01_6 = {73 65 74 74 69 6d 65 72 2c 6e 74 64 65 74 65 63 31 } 		$a_01_7 = {69 66 69 6e 73 74 72 69 6e 67 2c 54 69 74 6c 65 2c 47 6f 6f 67 6c 65 20 73 65 61 72 63 68 20 2d 20 4d 69 63 72 6f 73 6f 66 74 20 49 6e 74 65 72 6e 65 74 20 45 78 70 6c 6f 72 65 72 } 		$a_01_8 = {72 75 6e 2c 68 74 74 70 3a 2f 2f 77 77 77 2e 67 6f 6f 67 6c 65 2e 63 6f 6d 2f 63 75 73 74 6f 6d 3f 68 6c 3d 65 6e 26 63 6c 69 65 6e 74 3d 70 75 62 2d 32 31 34 31 32 32 31 33 39 34 38 30 31 32 34 39 26 63 68 61 6e 6e 65 6c 3d 37 32 31 35 34 34 38 38 37 30 } 		$a_01_9 = {73 65 74 74 69 6d 65 72 2c 74 69 74 6c 65 2c 31 30 30 30 } 		$a_01_10 = {46 69 6c 65 43 6f 70 79 2c 25 65 6c 65 6d 65 6e 74 25 3a 5c 6e 74 64 65 74 65 63 31 2e 65 78 65 2c 63 3a 5c 6e 74 64 65 74 65 63 31 5c 63 68 69 6c 64 5c 6e 74 64 65 74 65 63 31 2e 65 78 65 2c 31 } 		$a_01_11 = {46 69 6c 65 73 65 74 61 74 74 72 69 62 2c 2b 53 48 2c 43 3a 5c 6e 74 64 65 74 65 63 31 2c 31 2c 31 } 	condition:
		((#a_01_0  & 1)*1+(#a_01_1  & 1)*1+(#a_01_2  & 1)*1+(#a_01_3  & 1)*1+(#a_01_4  & 1)*2+(#a_01_5  & 1)*2+(#a_01_6  & 1)*1+(#a_01_7  & 1)*2+(#a_01_8  & 1)*2+(#a_01_9  & 1)*1+(#a_01_10  & 1)*2+(#a_01_11  & 1)*2) >=4
 
}

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

e0eb6bb5-e24d-434e-940f-b7188fa8ab41

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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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