win_bunitu_auto

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

Detects win.bunitu.

rule win_bunitu_auto {

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

    


    strings:
        $sequence_0 = { 8bf7 03d8 ebdf 8bb544feffff }
                                                            
        $sequence_1 = { 57 8d859cf7ffff 50 e8???????? 8d8d9cf7ffff 51 }
                                                                                    
        $sequence_2 = { ffb544feffff 51 6800040000 6a00 ff15???????? }
                                                                        
        $sequence_3 = { 60 8b7d08 8b9774130000 8955e0 8b9778130000 8955dc }
                                                                                    
        $sequence_4 = { b970170000 f2ae 2bfa 87fa 5f 8bc2 }
                                                                                    
        $sequence_5 = { 81c498f7ffff 57 8dbd9cf7ffff 2bc0 b968080000 f3aa 5f }
                                                                                                
        $sequence_6 = { 87fa 5f 8bc2 48 40 8d443825 668b00 }
                                                                                                
        $sequence_7 = { 50 8f06 33db 83c301 d1e3 d1e3 03fb }
                                                                                                
        $sequence_8 = { 6800100000 50 ff75fc e8???????? }
                                                            
        $sequence_9 = { 59 8bd0 8bdf b82f000000 }
                                                            
    condition:
        7 of them and filesize < 221184
}

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

c1d76c79-a9b0-4431-9699-5b3ba187ad36

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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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