win_3cx_backdoor_auto

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

Detects win.3cx_backdoor.

rule win_3cx_backdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.3cx_backdoor."
        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.3cx_backdoor"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    


    strings:
        $sequence_0 = { 448be6 4183e43f 410fbaec07 81feff070000 7f0d 81ce00300000 c1ee06 }
                                                                                                
        $sequence_1 = { 894640 83f80d 0f84ebf9ffff 83f80a 0f85d1070000 48834310f8 4c8b85e0010000 }
                                                                                                
        $sequence_2 = { 448826 48894608 498b07 48894608 c60605 4d8b4608 498b06 }
                                                                                                
        $sequence_3 = { 4883c0f8 4883f81f 0f8779010000 e8???????? 4c897c2478 }
                                                                        
        $sequence_4 = { e8???????? 83f82a 0f84aa000000 83f82f 7413 488d052d460300 }
                                                                                    
        $sequence_5 = { 493bec e9???????? 488bc3 4c8d3d4187feff 498784f708240400 4885c0 7409 }
                                                                                                
        $sequence_6 = { 0f85eb020000 498b08 4c3bc9 0f85ea000000 498b4810 80791800 756d }
                                                                                                
        $sequence_7 = { ffe1 0f57c0 0f11442460 b910000000 e8???????? 488bd8 }
                                                                                    
        $sequence_8 = { 488b9598000000 4883fa10 0f8294090000 48ffc2 488b8d80000000 488bc1 4881fa00100000 }
                                                                                                
        $sequence_9 = { 0f84f6140000 498bcc e8???????? 894340 83f80c 0f85af050000 c6859001000000 }
                                                                                                
    condition:
        7 of them and filesize < 585728
}

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

10d57381-8a00-44cb-8382-980a75d0f37e

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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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