win_crylocker_auto

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

Detects win.crylocker.

rule win_crylocker_auto {

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

    


    strings:
        $sequence_0 = { e8???????? 8b442434 83c420 6800010000 8d542420 }
                                                                        
        $sequence_1 = { 50 ff15???????? 8bf8 897c240c 83ffff }
                                                                        
        $sequence_2 = { 8b442438 50 8d4c2448 51 }
                                                            
        $sequence_3 = { c744246c10a64000 c744247000000000 e8???????? 8b54240c 8b442408 8d4c244c 51 }
                                                                                                
        $sequence_4 = { 8d542418 52 8bc2 50 68???????? e8???????? }
                                                                                    
        $sequence_5 = { 742e 6afe e8???????? 83c404 6a00 68c0270900 }
                                                                                    
        $sequence_6 = { 83ec6c 8d442418 50 e8???????? }
                                                            
        $sequence_7 = { 8d4c2434 68???????? 51 e8???????? 8d54243c 68???????? 52 }
                                                                                                
        $sequence_8 = { e8???????? 57 e8???????? 53 e8???????? 8b5c2420 8b7c241c }
                                                                                                
        $sequence_9 = { 5e 5b 83c40c c3 83ec0c 56 8d442404 }
                                                                                                
    condition:
        7 of them and filesize < 139264
}

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

57c76e87-346c-4f81-93e6-f85e6827d01b

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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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