win_blackcat_auto

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

Detects win.blackcat.

rule win_blackcat_auto {

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

    


    strings:
        $sequence_0 = { eb16 8d441701 f7d2 8b4df0 0355ec 8901 895104 }
                                                                                                
        $sequence_1 = { 760f 833801 89c7 7508 83c704 e9???????? a1???????? }
                                                                                                
        $sequence_2 = { 01f3 01d3 8b45e4 895dd4 31db 83c0fd 8945d0 }
                                                                                                
        $sequence_3 = { 8d8cb99c010000 ff75dc 51 50 e8???????? }
                                                                        
        $sequence_4 = { 8906 895e04 0f84c4000000 8b460c 85ff 7513 }
                                                                                    
        $sequence_5 = { 8b39 85ff 74e2 381437 75db }
                                                                        
        $sequence_6 = { 897dec 894df0 7428 8d7de8 }
                                                            
        $sequence_7 = { 39f0 7225 8b07 01d8 56 51 }
                                                                                    
        $sequence_8 = { 8a5d08 b018 88dc fecc 80fc07 }
                                                                        
        $sequence_9 = { 53 52 50 e8???????? 83c40c 01df b004 }
                                                                                                
    condition:
        7 of them and filesize < 29981696
}

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

d9af731a-722d-4a01-b70f-a0671feb64b7

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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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