win_rapid_ransom_auto

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

Detects win.rapid_ransom.

rule win_rapid_ransom_auto {

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

    


    strings:
        $sequence_0 = { 50 6801000004 6800a40000 ff75f8 ff15???????? }
                                                                        
        $sequence_1 = { 57 663901 7561 8b713c 03f1 813e50450000 }
                                                                                    
        $sequence_2 = { b301 ff75fc ff15???????? 6a00 }
                                                            
        $sequence_3 = { 6a00 68a7000000 6a01 e8???????? }
                                                            
        $sequence_4 = { ff15???????? 8bd8 895c2434 85db 7509 }
                                                                        
        $sequence_5 = { 8b3d???????? 6a00 6a06 6a00 ff75fc ffd7 85c0 }
                                                                                                
        $sequence_6 = { 8bd0 8bce e8???????? 8b0d???????? 8b75ec 50 }
                                                                                    
        $sequence_7 = { 57 33ff 8945fc 32db }
                                                            
        $sequence_8 = { ffd6 85c0 753b 8b542410 b9???????? e8???????? }
                                                                                    
        $sequence_9 = { 81784820c14100 7409 ff7048 e8???????? 59 c70701000000 }
                                                                                    
        $sequence_10 = { 8b4514 40 c745ecf54e4000 894df8 }
                                                            
        $sequence_11 = { 56 57 6804010000 8d85f8feffff 8bfa }
                                                                        
        $sequence_12 = { e8???????? c70021000000 eb44 c745e002000000 c745e494824100 8b4508 8bcf }
                                                                                                
        $sequence_13 = { 8bcb 8b55ec 68???????? 893d???????? e8???????? 83c404 84c0 }
                                                                                                
        $sequence_14 = { 8b75ec 8ac4 8b7de4 c0e102 c0eb04 }
                                                                        
    condition:
        7 of them and filesize < 286720
}

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

2fd1480d-aa01-4907-aedc-5a68b94a4625

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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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