win_thunker_auto

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

Detects win.thunker.

rule win_thunker_auto {

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

    


    strings:
        $sequence_0 = { 7505 e9???????? ffb5fcfdffff e8???????? 68???????? 8d8500feffff }
                                                                                    
        $sequence_1 = { e8???????? 8d8500feffff 50 e8???????? 8d8500feffff 50 68???????? }
                                                                                                
        $sequence_2 = { 7417 e9???????? 3de7710000 7433 7c79 }
                                                                        
        $sequence_3 = { 8d0556412600 8945fc a1???????? 8945e8 8d05a02a2600 8945dc 8365f000 }
                                                                                                
        $sequence_4 = { e8???????? 83c40c 09c0 750d }
                                                            
        $sequence_5 = { e8???????? 6a06 53 e8???????? 83c410 eb40 6a04 }
                                                                                                
        $sequence_6 = { 09c0 743b 6a00 6800100000 8d85fceeffff 50 ffb5e0edffff }
                                                                                                
        $sequence_7 = { c6843d00feffff00 09ff 7405 83ffff 7502 eb48 }
                                                                                    
        $sequence_8 = { 83c40c 8d8544edffff 50 e8???????? 8985c4edffff }
                                                                        
        $sequence_9 = { 89e5 51 56 57 8b7d08 ff750c }
                                                                                    
    condition:
        7 of them and filesize < 73728
}

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

33ea0fd8-6e41-4609-a771-08e3a2d2588d

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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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