win_gemcutter_auto

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

Detects win.gemcutter.

rule win_gemcutter_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.gemcutter."
        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.gemcutter"
        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 ff15???????? 8d85f0fdffff 53 50 8d45f0 50 }
                                                                                                
        $sequence_1 = { 53 53 ff15???????? 8d85f0fdffff 6800020000 }
                                                                        
        $sequence_2 = { e8???????? 8d85f0fdffff 56 50 e8???????? 8b35???????? }
                                                                                    
        $sequence_3 = { ff15???????? 8d85f0fdffff 6800020000 50 ff15???????? 8d85f0fdffff 68???????? }
                                                                                                
        $sequence_4 = { 53 50 ffd6 8d85f0fcffff }
                                                            
        $sequence_5 = { 8a08 84c9 7408 80e905 8808 40 ebf2 }
                                                                                                
        $sequence_6 = { 8d8500fcffff 68???????? 50 e8???????? 59 33c0 }
                                                                                    
        $sequence_7 = { 7408 80e905 8808 40 ebf2 c3 }
                                                                                    
        $sequence_8 = { ff15???????? 83c420 8818 8d85f0fdffff 50 }
                                                                        
        $sequence_9 = { 8d85f0fdffff 59 50 ff15???????? 0c06 50 }
                                                                                    
    condition:
        7 of them and filesize < 40960
}

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

e21e93ce-2672-40fd-ad69-94310225eb84

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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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