TrojanDropper_Win32_Chayka_A

YARA detection rule by roadwy

TrojanDropper:Win32/Chayka.A,SIGNATURE_TYPE_PEHSTR,29 00 29 00 08 00 00

rule TrojanDropper_Win32_Chayka_A{
	meta:
		description = "TrojanDropper:Win32/Chayka.A,SIGNATURE_TYPE_PEHSTR,29 00 29 00 08 00 00 "
		
	strings :
		$a_01_0 = {48 6f 6f 6b 49 6e 69 74 } 		$a_01_1 = {73 76 72 68 6f 73 74 2e 65 78 65 } 		$a_01_2 = {64 65 6c 20 2f 46 20 22 2e 5c 25 73 } 		$a_01_3 = {53 6f 66 74 77 61 72 65 5c 4d 69 63 72 6f 73 6f 66 74 5c 57 69 6e 64 6f 77 73 20 4e 54 5c 43 75 72 72 65 6e 74 56 65 72 73 69 6f 6e 5c 57 69 6e 6c 6f 67 6f 6e } 		$a_01_4 = {64 62 6c 64 72 76 2e 64 6c 6c } 		$a_01_5 = {64 62 78 64 72 76 2e 64 6c 6c } 		$a_01_6 = {7b 45 35 37 32 33 36 34 33 2d 34 30 41 34 2d 34 32 63 30 2d 38 37 44 35 2d 32 33 44 45 45 45 30 42 32 43 35 46 7d } 		$a_01_7 = {7b 36 34 44 34 35 41 39 33 2d 30 30 44 44 2d 34 31 63 62 2d 41 31 38 37 2d 46 46 30 32 41 31 35 41 45 33 32 42 7d } 	condition:
		((#a_01_0  & 1)*10+(#a_01_1  & 1)*10+(#a_01_2  & 1)*10+(#a_01_3  & 1)*10+(#a_01_4  & 1)*1+(#a_01_5  & 1)*1+(#a_01_6  & 1)*1+(#a_01_7  & 1)*1) >=41
 
}

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

cb98152e-4f24-468f-a5d9-c6270e00f615

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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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