win_yakuza_ransomware_auto

YARA detection rule by Felix Bilstein - yara-signator at cocacoding dot com

Detects win.yakuza_ransomware.

rule win_yakuza_ransomware_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.yakuza_ransomware."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.yakuza_ransomware"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    


    strings:
        $sequence_0 = { 33f6 66837d08ff 8b480c 0fb7d6 7410 8b4904 52 }
                                                                                                
        $sequence_1 = { e8???????? 8bf0 83c410 89b55cfdffff c645fc17 0f57c0 0f1106 }
                                                                                                
        $sequence_2 = { ffd2 ffb53cffffff 8b9548ffffff 8b8d40ffffff 52 ffb538ffffff ffb524ffffff }
                                                                                                
        $sequence_3 = { 8b4df0 83e950 e9???????? 8b4df0 e9???????? 8b542408 8d420c }
                                                                                                
        $sequence_4 = { eb03 0fb3c8 8902 83f91f 7303 41 ebda }
                                                                                                
        $sequence_5 = { 23c3 f7d1 3344247c 23cd 334c2478 89842444010000 8bc5 }
                                                                                                
        $sequence_6 = { 8b12 8b4d08 83791408 8b7910 7202 8b09 3bf7 }
                                                                                                
        $sequence_7 = { e8???????? 83c404 f6c310 742d 83e3ef 895d60 8b4dd0 }
                                                                                                
        $sequence_8 = { 83c40c 8b45d8 c1f802 8d0486 894704 c785c0fbffff00000000 c645fc05 }
                                                                                                
        $sequence_9 = { e9???????? 83e908 e9???????? 2b49fc 81e910010000 e9???????? 83e904 }
                                                                                                
    condition:
        7 of them and filesize < 2811904
}

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

3d395d1e-7d57-4a66-91ad-c2676d5a0805

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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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