win_crypt0l0cker_auto

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

Detects win.crypt0l0cker.

rule win_crypt0l0cker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.crypt0l0cker."
        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.crypt0l0cker"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    


    strings:
        $sequence_0 = { 55 6a00 ff35???????? ff15???????? 8bf0 85f6 0f84c0000000 }
                                                                                                
        $sequence_1 = { 7409 80f917 0f85b8000000 51 8b0f }
                                                                        
        $sequence_2 = { 8bcf e8???????? 85c0 74e3 8b4508 33c9 8b13 }
                                                                                                
        $sequence_3 = { 8d542428 8bce e8???????? 8944241c 85c0 0f845b020000 55 }
                                                                                                
        $sequence_4 = { 85c0 756c 8bb538fdffff 83bdd4fcffff01 750c ffb5dcfcffff e8???????? }
                                                                                                
        $sequence_5 = { 03d9 3bd9 7301 47 8b4508 0fb75012 0fb74810 }
                                                                                                
        $sequence_6 = { 8b542450 e8???????? 83c420 f646f802 742e }
                                                                        
        $sequence_7 = { 6a20 e8???????? 83c410 8bc6 5f 5e 5b }
                                                                                                
        $sequence_8 = { 8974241c ff15???????? 85c0 741f 8b442420 85c0 7406 }
                                                                                                
        $sequence_9 = { 83c1fe 85c9 7e10 8d642400 66833c4a2e 7409 49 }
                                                                                                
    condition:
        7 of them and filesize < 917504
}

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

0af3f3be-66ba-488c-8685-cb4eb26662be

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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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