win_mirrorkey_auto

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

Detects win.mirrorkey.

rule win_mirrorkey_auto {

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

    


    strings:
        $sequence_0 = { 41 8b7508 03c8 8a1431 }
                                                            
        $sequence_1 = { 8945f8 8b441720 03c7 8945fc }
                                                            
        $sequence_2 = { 8a1c19 8d4f01 81e103000080 7905 49 }
                                                                        
        $sequence_3 = { 8a5c1001 84db 7454 8bb5e8feffff }
                                                            
        $sequence_4 = { 8b7908 8b4d08 8b44171c 8b5c1718 03c7 8945ec }
                                                                                    
        $sequence_5 = { ff15???????? 8b4310 6a00 6a01 56 }
                                                                        
        $sequence_6 = { 895dfc 6690 a1???????? be01000000 8b3d???????? a3???????? b8???????? }
                                                                                                
        $sequence_7 = { 8d4901 0fb642ff 3041ff 0fb64203 304103 0fb64207 }
                                                                                    
        $sequence_8 = { 50 8d45f8 50 e8???????? 8b4df8 56 8b4914 }
                                                                                                
        $sequence_9 = { 03c7 8945ec 8b441724 03c7 8945f8 }
                                                                        
    condition:
        7 of them and filesize < 117760
}

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

06df73f4-2c27-44e1-a864-c1a2d7b3eea3

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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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