Trojan_Win32_Ursnif_BF_MTB

YARA detection rule by roadwy

Trojan:Win32/Ursnif.BF!MTB,SIGNATURE_TYPE_PEHSTR_EXT,02 00 02 00 02 00 00

rule Trojan_Win32_Ursnif_BF_MTB{
	meta:
		description = "Trojan:Win32/Ursnif.BF!MTB,SIGNATURE_TYPE_PEHSTR_EXT,02 00 02 00 02 00 00 "
		
	strings :
		$a_02_0 = {83 e9 4e 0f b6 15 ?? ?? ?? ?? 2b ca 89 0d ?? ?? ?? ?? a1 ?? ?? ?? ?? 03 45 ?? 8b 88 ?? ?? ?? ?? 89 0d ?? ?? ?? ?? 8b 55 ?? 0f af 15 ?? ?? ?? ?? 03 15 ?? ?? ?? ?? 89 15 ?? ?? ?? ?? 6b 05 } 		$a_02_1 = {33 c9 8b 55 ?? 2b d0 8b 45 ?? 1b c1 8b 4d ?? 33 f6 2b ca 1b f0 89 4d ?? 8b 15 ?? ?? ?? ?? 81 c2 ?? ?? ?? ?? 89 15 ?? ?? ?? ?? a1 ?? ?? ?? ?? 03 45 ?? 8b 0d ?? ?? ?? ?? 89 88 ?? ?? ?? ?? 8b 55 ?? 81 ea ?? ?? ?? ?? 2b 15 ?? ?? ?? ?? 03 55 fc 03 55 fc 89 55 fc 6b 45 fc ?? 0f b6 0d ?? ?? ?? ?? 03 c1 } 	condition:
		((#a_02_0  & 1)*1+(#a_02_1  & 1)*1) >=2
 
}

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

832c130d-4a75-404b-ae51-2b5e1a18cfb4

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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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