Backdoor_Win32_Fynloski_F

YARA detection rule by roadwy

Backdoor:Win32/Fynloski.F,SIGNATURE_TYPE_PEHSTR_EXT,14 00 14 00 0c 00 00

rule Backdoor_Win32_Fynloski_F{
	meta:
		description = "Backdoor:Win32/Fynloski.F,SIGNATURE_TYPE_PEHSTR_EXT,14 00 14 00 0c 00 00 "
		
	strings :
		$a_01_0 = {4d 55 54 45 58 4e 41 4d 45 } 		$a_01_1 = {53 45 52 56 44 4e 41 4d 45 } 		$a_01_2 = {41 43 54 49 56 58 4e 41 4d 45 } 		$a_01_3 = {41 4e 54 49 56 4d } 		$a_01_4 = {4d 45 4c 54 } 		$a_01_5 = {47 45 54 4d 53 4e 49 4e 46 4f } 		$a_01_6 = {23 62 6f 74 43 6f 6d 6d 61 6e 64 25 4d 61 73 73 } 		$a_01_7 = {49 6e 59 6f 75 72 41 73 73 } 		$a_01_8 = {47 65 74 53 49 4e } 		$a_01_9 = {52 65 6d 6f 74 65 45 72 72 6f 72 45 72 72 6f 72 20 6f 6e 20 6b 69 6c 6c 20 70 72 6f 63 65 73 73 } 		$a_01_10 = {52 65 6d 6f 74 65 45 72 72 6f 72 45 72 72 6f 72 20 6f 6e 20 52 75 6e 20 66 69 6c 65 20 61 73 20 61 64 6d 69 6e } 		$a_03_11 = {80 fb 31 75 0d 8d ?? ?? b8 ?? ?? ?? ?? e8 ?? ?? ?? ?? 80 fb 32 75 0d 8d ?? ?? b8 ?? ?? ?? ?? e8 ?? ?? ?? ?? 80 fb 33 75 0d 8d ?? ?? b8 ?? ?? ?? ?? e8 ?? ?? ?? ?? 80 fb 34 75 0d 8d ?? ?? b8 ?? ?? ?? ?? e8 ?? ?? ?? ?? 80 fb 35 75 0d } 	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)*1+(#a_01_5  & 1)*1+(#a_01_6  & 1)*1+(#a_01_7  & 1)*1+(#a_01_8  & 1)*1+(#a_01_9  & 1)*1+(#a_01_10  & 1)*1+(#a_03_11  & 1)*15) >=20
 
}

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

5ce7e7c4-405b-4b6d-ba21-547513b3bbf8

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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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