win_yokai_auto

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

Detects win.yokai.

rule win_yokai_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.yokai."
        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.yokai"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    


    strings:
        $sequence_0 = { 0f85fa000000 0fb75514 81faff000000 7e38 837d0c00 7418 837d1000 }
                                                                                                
        $sequence_1 = { 55 8bec 83ec0c 894dfc 8b45fc 83c030 50 }
                                                                                                
        $sequence_2 = { ff500c 3bf4 e8???????? 8b4db0 894130 8b45b0 }
                                                                                    
        $sequence_3 = { 898d7cffffff 895580 8d4d0c e8???????? 8b857cffffff 8b5580 8be5 }
                                                                                                
        $sequence_4 = { c745e400000000 8b4d08 034de4 894dd0 837d1000 7e09 c745e001000000 }
                                                                                                
        $sequence_5 = { e8???????? 8d8578ffffff 50 6a00 688f010000 68???????? 68???????? }
                                                                                                
        $sequence_6 = { d3e0 83e801 23d0 8955e4 eb56 8b4d14 8b11 }
                                                                                                
        $sequence_7 = { 0355f4 0355f0 8955ec b801000000 6bc800 8b55ec c6040a30 }
                                                                                                
        $sequence_8 = { 83790402 7423 68???????? 68???????? 6a00 6a52 68???????? }
                                                                                                
        $sequence_9 = { e8???????? 83c420 8945d8 8d4dfc e8???????? 8d4dc4 e8???????? }
                                                                                                
    condition:
        7 of them and filesize < 2066432
}

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

47d0663f-6564-4597-9152-284d57d13412

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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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