TrojanDownloader_Linux_Ursnif_A_2

YARA detection rule by roadwy

TrojanDownloader:Linux/Ursnif.A,SIGNATURE_TYPE_MACROHSTR_EXT,03 00 03 00 02 00 00

rule TrojanDownloader_Linux_Ursnif_A_2{
	meta:
		description = "TrojanDownloader:Linux/Ursnif.A,SIGNATURE_TYPE_MACROHSTR_EXT,03 00 03 00 02 00 00 "
		
	strings :
		$a_03_0 = {41 74 74 72 69 62 75 74 65 20 56 42 5f 4e 61 6d 65 20 3d 20 22 [0-12] 50 75 62 6c 69 63 20 46 75 6e 63 74 69 6f 6e 20 90 05 10 06 41 2d 5a 61 2d 7a 28 42 79 56 61 6c 20 90 05 10 06 41 2d 5a 61 2d 7a 20 41 73 20 53 74 72 69 6e 67 2c 20 42 79 56 61 6c 20 90 05 10 06 41 2d 5a 61 2d 7a 20 41 73 20 53 74 72 69 6e 67 29 20 41 73 20 53 74 72 69 6e 67 [0-40] 46 6f 72 20 90 05 10 06 41 2d 5a 61 2d 7a 20 3d 20 90 05 10 06 41 2d 5a 61 2d 7a 20 54 6f 20 90 05 10 06 41 2d 5a 61 2d 7a 2e 90 05 10 06 41 2d 5a 61 2d 7a 28 22 90 1d 25 00 22 2c 20 90 1b 02 29 [0-04] 90 1b 01 20 3d 20 90 1b 07 2e 90 05 10 06 41 2d 5a 61 2d 7a 28 22 90 1d 25 00 22 2c 20 90 1b 01 2c } 		$a_03_1 = {49 66 20 4e 6f 74 20 90 05 10 06 41 2d 5a 61 2d 7a 2e 90 1d 18 00 28 90 1d 18 00 2c 20 22 90 04 02 09 30 2d 39 41 2d 5a 61 2d 7a 90 1d 20 00 22 2c } 	condition:
		((#a_03_0  & 1)*2+(#a_03_1  & 1)*1) >=3
 
}

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

3476d60e-cf21-4723-84dc-2607ff760529

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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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