win_nachocheese_auto

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

Detects win.nachocheese.

rule win_nachocheese_auto {

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

    


    strings:
        $sequence_0 = { e8???????? 6a01 688d000000 56 e8???????? 50 }
                                                                                    
        $sequence_1 = { 3d2bc00000 7d1b 3d9c000000 7c07 }
                                                            
        $sequence_2 = { c3 8d85ecfaffff 68???????? 50 e8???????? 83c408 85c0 }
                                                                                                
        $sequence_3 = { 81fb00000100 7305 83c304 eb0f }
                                                            
        $sequence_4 = { 85c0 741c 8b8de8faffff 68???????? }
                                                            
        $sequence_5 = { 33c8 894710 8b4708 33c1 }
                                                            
        $sequence_6 = { 7f05 83e830 eb03 83e837 }
                                                            
        $sequence_7 = { 3d9f000000 7e0d 33c0 c3 }
                                                            
        $sequence_8 = { 33c0 c3 05d13fffff 83f801 }
                                                            
        $sequence_9 = { 3d2cc00000 7f18 3d2bc00000 7d1b }
                                                            
        $sequence_10 = { 52 66894b02 ff15???????? 8bf0 }
                                                            
        $sequence_11 = { 8895f0fcffff 8d95f1fcffff 6a00 52 e8???????? 6a3a 68???????? }
                                                                                                
        $sequence_12 = { 3d9c000000 7c07 3d9f000000 7e0d }
                                                            
        $sequence_13 = { 2bfa 8d47fd 3901 8901 }
                                                            
        $sequence_14 = { 33f6 6a03 8bf9 8975f8 e8???????? 83c404 8975fc }
                                                                                                
        $sequence_15 = { 8b55fc 880c3e 8a540205 32d1 8b4df8 88143e 8a4c0105 }
                                                                                                
    condition:
        7 of them and filesize < 1064960
}

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

68aaa626-8959-4845-87ff-7c7f8dbc3312

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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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