win_gunra_auto

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

Detects win.gunra.

rule win_gunra_auto {

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

    


    strings:
        $sequence_0 = { ff15???????? 8b442440 c1f806 4898 488d0da3d30700 8b542440 83e23f }
                                                                                                
        $sequence_1 = { 8b842480000000 c1f806 4898 488d0d345e0500 8b942480000000 83e23f 4863d2 }
                                                                                                
        $sequence_2 = { 488985c0010000 488d15463c1200 488d8d28160000 e8???????? 488bc8 e8???????? 488985c8010000 }
                                                                                                
        $sequence_3 = { 488d05f1b40300 4889442428 488d0555530100 4889442420 4533c9 41b8da010000 }
                                                                                    
        $sequence_4 = { 0ac1 8b4c2470 c1f906 4863c9 488d1555550500 448b442470 4183e03f }
                                                                                                
        $sequence_5 = { 48894c2408 55 57 4881ece8000000 488d6c2420 488d0d38251500 }
                                                                                    
        $sequence_6 = { 83bd0001000001 750d 488d05038e1200 48894508 eb18 83bd0001000002 750d }
                                                                                                
        $sequence_7 = { eb08 c744243000000000 8b442430 89442434 837c243400 753a 488d05963f0900 }
                                                                                                
        $sequence_8 = { e8???????? 488bc8 e8???????? 488985e8000000 488d151c3e1200 488d8d18110000 e8???????? }
                                                                                                
        $sequence_9 = { 488b85c0000000 488b8dc8000000 66833c4800 75e4 488b85c8000000 eb0c 488b8df0000000 }
                                                                                                
    condition:
        7 of them and filesize < 5222400
}

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

90b0c5bb-6e22-4cf2-bcec-18b09f8ef312

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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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