win_lemonduck_auto

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

Detects win.lemonduck.

rule win_lemonduck_auto {

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

    


    strings:
        $sequence_0 = { 751c e8???????? 85c0 7405 4c8bc5 eb0e 4c8d05ebf21800 }
                                                                                                
        $sequence_1 = { f6c101 746f 483b7b18 7458 488b47f0 4885c0 743e }
                                                                                                
        $sequence_2 = { e8???????? 4c8d0d81550200 b915000000 4c8d056d550200 488d156e550200 e8???????? 4c8d0d82550200 }
                                                                                                
        $sequence_3 = { eb02 32c0 84c0 0f85d8000000 b918000000 e8???????? 488bd8 }
                                                                                                
        $sequence_4 = { 664c0f6ec8 488b4650 48334640 66440f6cc8 66480f6ec1 660f7f7580 488d8df0100000 }
                                                                                                
        $sequence_5 = { eb03 41311b 410fb6819a000000 418b1c82 410fb68199000000 4d8d1c82 410fb68198000000 }
                                                                                                
        $sequence_6 = { 4d8bef 89942488000000 eb5c 488d15229b1500 498bcd 48c1e105 8b441108 }
                                                                                                
        $sequence_7 = { eb51 418b813c010000 03c3 410103 eb43 41291b eb3e }
                                                                                                
        $sequence_8 = { 7426 0f1f4000 0f1f840000000000 498b0cd2 488b4128 80780c00 7509 }
                                                                                                
        $sequence_9 = { 83f802 0f86b6000000 83f90b 0f84ad000000 8d82fcf3ffff a9fdffffff 0f849c000000 }
                                                                                                
    condition:
        7 of them and filesize < 10011648
}

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

d05dc256-3e4f-4ff7-aa60-5e50eaf39792

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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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