TrojanDownloader_Win32_Femad

YARA detection rule by roadwy

TrojanDownloader:Win32/Femad,SIGNATURE_TYPE_PEHSTR_EXT,09 00 07 00 13 00 00

rule TrojanDownloader_Win32_Femad{
	meta:
		description = "TrojanDownloader:Win32/Femad,SIGNATURE_TYPE_PEHSTR_EXT,09 00 07 00 13 00 00 "
		
	strings :
		$a_00_0 = {67 6f 66 75 63 6b 79 6f 75 72 73 65 6c 66 2e 63 6f 6d } 		$a_00_1 = {63 72 75 74 6f 70 2e 6e 75 } 		$a_00_2 = {65 78 70 6c 6f 72 65 72 3a 54 72 6f 6a 61 6e 20 48 6f 72 73 65 20 41 4c 45 52 54 21 } 		$a_00_3 = {3a 53 70 79 77 61 72 65 20 54 72 6f 6a 61 6e 20 48 6f 72 73 65 20 41 4c 45 52 54 21 } 		$a_00_4 = {69 66 20 65 78 69 73 74 20 25 31 20 67 6f 74 6f 20 73 74 61 72 74 } 		$a_00_5 = {2e 73 65 65 6b 2d 61 6c 6c 2e 63 6f 6d 2f 73 65 61 72 63 68 2e 70 68 70 3f } 		$a_00_6 = {2e 61 64 61 77 61 72 65 2e 63 63 } 		$a_00_7 = {64 69 61 6c 65 72 73 63 68 75 74 7a 2e 64 65 } 		$a_00_8 = {77 65 62 6d 61 73 74 65 72 77 6f 72 6c 64 2e 63 6f 6d } 		$a_00_9 = {2e 61 64 2d 77 61 72 65 2e 63 63 } 		$a_00_10 = {2e 63 65 78 78 2e 6f 72 67 } 		$a_02_11 = {47 45 54 00 ff ff ff ff ?? ?? 40 00 ?? ?? 40 00 65 78 70 6c 6f 72 65 72 2e 65 78 65 } 		$a_01_12 = {47 45 54 00 4d 6f 7a 69 6c 6c 61 2f 34 2e 30 } 		$a_00_13 = {2e 65 78 65 00 00 00 68 74 74 70 3a 2f 2f } 		$a_00_14 = {c6 47 02 74 c6 47 04 3a c6 47 05 2f c6 07 68 } 		$a_02_15 = {89 5d d4 66 81 3b 4d 5a 0f 85 ?? 00 00 00 8b 43 3c 03 c3 89 45 d0 81 38 50 45 00 00 75 } 		$a_02_16 = {8a 02 56 57 2c ?? 0f b6 f8 57 8d 42 01 50 8b f1 56 6a 01 52 e8 } 		$a_00_17 = {57 8b 7c 24 0c 0f b6 f0 56 8d 41 01 50 57 6a 01 51 e8 } 		$a_00_18 = {1b 8a 19 88 18 88 11 8a ca 02 08 0f b6 c1 8a 84 05 } 	condition:
		((#a_00_0  & 1)*2+(#a_00_1  & 1)*2+(#a_00_2  & 1)*2+(#a_00_3  & 1)*2+(#a_00_4  & 1)*2+(#a_00_5  & 1)*2+(#a_00_6  & 1)*1+(#a_00_7  & 1)*1+(#a_00_8  & 1)*1+(#a_00_9  & 1)*1+(#a_00_10  & 1)*1+(#a_02_11  & 1)*2+(#a_01_12  & 1)*1+(#a_00_13  & 1)*1+(#a_00_14  & 1)*2+(#a_02_15  & 1)*3+(#a_02_16  & 1)*2+(#a_00_17  & 1)*2+(#a_00_18  & 1)*3) >=7
 
}

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

7410a6f9-c123-4527-a237-8aa8329dd64f

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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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