win_medusalocker_auto

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

Detects win.medusalocker.

rule win_medusalocker_auto {

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

    


    strings:
        $sequence_0 = { 8b45ec 83e001 740c 8365ecfe 8d4d9c e8???????? }
                                                                                    
        $sequence_1 = { 894df4 8b4510 8945f8 6a00 8d4df8 }
                                                                        
        $sequence_2 = { e8???????? c645fc00 8d4dd8 e8???????? 8b4d0c 51 e8???????? }
                                                                                                
        $sequence_3 = { ba01000000 85d2 742d 8b4d0c e8???????? 6a00 6840420f00 }
                                                                                                
        $sequence_4 = { 8d8d58ffffff e8???????? 8945c4 8b4dc4 894dc0 }
                                                                        
        $sequence_5 = { 52 e8???????? 83c40c 8b4510 2b45f4 50 }
                                                                                    
        $sequence_6 = { 894db8 8b4db8 e8???????? c745fc00000000 8d4dd8 }
                                                                        
        $sequence_7 = { e8???????? 83c404 8945d0 837dd000 7464 8b4d0c 51 }
                                                                                                
        $sequence_8 = { 8b5514 52 e8???????? 83c404 50 8b4510 }
                                                                                    
        $sequence_9 = { c785d0fdffff00000000 68???????? 8b95d0fdffff 52 8b8ddcfdffff e8???????? }
                                                                                    
    condition:
        7 of them and filesize < 1433600
}

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

d2e2f6cf-646a-4766-99b1-e1779034db03

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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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