win_yayih_auto

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

Detects win.yayih.

rule win_yayih_auto {

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

    


    strings:
        $sequence_0 = { 50 56 ff75fc 56 6a65 e8???????? 83c414 }
                                                                                                
        $sequence_1 = { 50 e8???????? 80bc05bbd8ffff20 59 745f }
                                                                        
        $sequence_2 = { 898574ffffff ffd7 8bf8 56 2b7dd8 }
                                                                        
        $sequence_3 = { ff75f8 ebd0 8d85bcd8ffff 50 }
                                                            
        $sequence_4 = { 8d85e8faffff 56 50 e8???????? 8d85b8b8ffff }
                                                                        
        $sequence_5 = { 53 e8???????? 56 ff75dc 56 56 }
                                                                                    
        $sequence_6 = { bf???????? 7512 8b7508 68???????? 56 e8???????? 59 }
                                                                                                
        $sequence_7 = { 50 e8???????? 8d854cf6ffff 68???????? 50 e8???????? 8d85f0fcffff }
                                                                                                
        $sequence_8 = { 6a06 ff35???????? ff15???????? 8b45f4 }
                                                            
        $sequence_9 = { 0fafca 0fb65002 03ca 890d???????? 0fb64803 69c960ea0000 }
                                                                                    
    condition:
        7 of them and filesize < 57344
}

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

cfbe8f9c-d643-4f2a-ba38-dbffdee992c2

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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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