win_kerrdown_auto

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

Detects win.kerrdown.

rule win_kerrdown_auto {

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

    


    strings:
        $sequence_0 = { c0e206 c0e902 80e10f 02c8 8a45eb 243f 884de5 }
                                                                                                
        $sequence_1 = { c60100 b9???????? c745fc00000000 c745d801000000 894de0 0f1f4000 }
                                                                                    
        $sequence_2 = { 8b3d???????? 83c40c 8b0d???????? 83ff10 8935???????? b8???????? 0f43c1 }
                                                                                                
        $sequence_3 = { 0f1f4000 8a19 48 8945dc 80fb3d }
                                                                        
        $sequence_4 = { c747140f000000 b8cd220000 837f1410 897dd4 897710 }
                                                                        
        $sequence_5 = { ff7518 6a00 ff15???????? 837d1c10 8d4d08 ff7518 0f434d08 }
                                                                                                
        $sequence_6 = { 68???????? 66a5 ff15???????? 5f 85c0 }
                                                                        
        $sequence_7 = { e8???????? 43 3bde 7ced 8bc7 8b4df4 64890d00000000 }
                                                                                                
        $sequence_8 = { 85c0 7543 50 6880000000 6a04 50 6a01 }
                                                                                                
        $sequence_9 = { 83e4f8 83ec20 a1???????? 33c4 8944241c 6807800000 ff15???????? }
                                                                                                
    condition:
        7 of them and filesize < 278528
}

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

99c7982f-b5f0-447b-91d5-cc71713faccd

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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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