TrojanDropper_Win32_Koutodoor_B

YARA detection rule by roadwy

TrojanDropper:Win32/Koutodoor.B,SIGNATURE_TYPE_PEHSTR_EXT,1a 00 1a 00 05 00 00

rule TrojanDropper_Win32_Koutodoor_B{
	meta:
		description = "TrojanDropper:Win32/Koutodoor.B,SIGNATURE_TYPE_PEHSTR_EXT,1a 00 1a 00 05 00 00 "
		
	strings :
		$a_00_0 = {5c 5c 2e 5c 47 6c 6f 62 61 6c 5c 72 6b 64 6f 6f 72 } 		$a_00_1 = {25 73 5c 25 73 20 25 73 5c 25 73 2e 64 6c 6c 2c 25 73 } 		$a_02_2 = {53 74 61 72 74 20 50 61 67 65 [0-04] 77 77 77 2e 62 61 69 64 75 2e 63 6f 6d [0-04] 3f 74 6e 3d } 		$a_00_3 = {73 79 73 74 65 6d 33 32 5c 64 72 69 76 65 72 73 5c 25 73 2e 73 79 73 } 		$a_00_4 = {53 59 53 54 45 4d 5c 43 75 72 72 65 6e 74 43 6f 6e 74 72 6f 6c 53 65 74 5c 53 65 72 76 69 63 65 73 5c 25 73 } 	condition:
		((#a_00_0  & 1)*10+(#a_00_1  & 1)*10+(#a_02_2  & 1)*5+(#a_00_3  & 1)*1+(#a_00_4  & 1)*1) >=26
 
}

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

9ca51669-1dca-4b09-9aaa-01cf27ed6e8f

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