win_heyoka_auto

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

Detects win.heyoka.

rule win_heyoka_auto {

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

    


    strings:
        $sequence_0 = { 8b45fc 0302 8945fc 8b4dfc c60100 8b55fc 83c201 }
                                                                                                
        $sequence_1 = { e8???????? 83c404 89857cd7feff 8b857cd7feff 89858cd7feff 8b8d90d7feff 83c141 }
                                                                                                
        $sequence_2 = { 668b55f4 52 ff15???????? 8b4d0c 8b11 66894202 817df400040000 }
                                                                                                
        $sequence_3 = { 894df4 8b55e0 8b8248280100 83c001 8b4de0 898148280100 }
                                                                                    
        $sequence_4 = { 8a02 8801 8b4dfc 894df8 eb07 c745f800000000 8be5 }
                                                                                                
        $sequence_5 = { 0f85ed030000 c785f4fbffff00000000 837d2000 0f849f010000 c685fcfbffff05 }
                                                                        
        $sequence_6 = { 68???????? e8???????? 83c404 83c8ff e9???????? 8b550c 8b4210 }
                                                                                                
        $sequence_7 = { 8b420c 8138ff000000 7331 8b8de4faffff 51 8b55fc 52 }
                                                                                                
        $sequence_8 = { 6820090000 8b45fc 50 e8???????? 8b4d08 }
                                                                        
        $sequence_9 = { 8955f0 eb14 8b8574d7feff 83c001 898574d7feff e9???????? 8d8d80d7feff }
                                                                                                
    condition:
        7 of them and filesize < 270336
}

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

247bb3ad-8a6d-46cd-af81-4c0d1343bd69

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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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