win_varenyky_auto

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

Detects win.varenyky.

rule win_varenyky_auto {

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

    


    strings:
        $sequence_0 = { 1bc0 83d8ff 85c0 0f8467010000 8d8c2490000000 51 6804010000 }
                                                                                                
        $sequence_1 = { 85c0 0f8ef7010000 8b15???????? a0???????? 6a00 }
                                                                        
        $sequence_2 = { bf697a0000 3bc3 7411 90 69ff81000000 }
                                                                        
        $sequence_3 = { 8d8c2454010000 68???????? 51 e8???????? 8d84245c010000 83c40c 8d5001 }
                                                                                                
        $sequence_4 = { 53 50 889c248c020000 e8???????? }
                                                            
        $sequence_5 = { 57 e8???????? 83c404 3c33 }
                                                            
        $sequence_6 = { 8d84244d030000 53 50 c744242404010000 889c2454030000 e8???????? }
                                                                                    
        $sequence_7 = { 0f8c0b0a0000 8ac2 2c20 3c58 7711 0fbec2 0fbe8030c24000 }
                                                                                                
        $sequence_8 = { 3bc3 7411 90 69ff81000000 41 }
                                                                        
        $sequence_9 = { 8b84241c010000 83c40c 50 33d2 80bc242602000001 b905000000 0f95c2 }
                                                                                                
    condition:
        7 of them and filesize < 24846336
}

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

11915117-60df-4f22-92ec-850c971c504d

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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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