win_microbackdoor_auto

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

Detects win.microbackdoor.

rule win_microbackdoor_auto {

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

    


    strings:
        $sequence_0 = { 56 ffd7 6810270000 ff15???????? }
                                                            
        $sequence_1 = { 8bce 0fb7811c100010 6689840dbcfbffff 03cb 6685c0 }
                                                                        
        $sequence_2 = { 488b4c2448 4885c9 740e ff15???????? 488b9c2488000000 488b4c2478 4885c9 }
                                                                                                
        $sequence_3 = { 8d45fc 50 ff15???????? 8b3d???????? 8bf0 85f6 }
                                                                                    
        $sequence_4 = { 5d c3 55 8bec ff750c ff15???????? 50 }
                                                                                                
        $sequence_5 = { 33db 56 8b750c 43 85f6 0f84a9010000 }
                                                                                    
        $sequence_6 = { 488b4c2450 8bd8 488d8578020000 4533c9 4533c0 }
                                                                        
        $sequence_7 = { ff750c 57 ff15???????? 57 ff7508 e8???????? }
                                                                                    
        $sequence_8 = { 4889442430 488d442444 33c9 4889442428 418b4110 4d8b4908 89442420 }
                                                                                                
        $sequence_9 = { 833f0a 7207 33c0 e9???????? 53 33db 56 }
                                                                                                
        $sequence_10 = { 8bec 83ec18 56 57 33c0 c745fc14000000 8d7de8 }
                                                                                                
        $sequence_11 = { 488bcb ff15???????? eb14 ff15???????? 488d0df6320000 8bd0 }
                                                                                    
        $sequence_12 = { 488b4c2438 4c8d4558 488d55e0 895d58 }
                                                            
        $sequence_13 = { e8???????? 448bf8 488bcf ff15???????? 4585ff }
                                                                        
        $sequence_14 = { 488b9c24f8020000 4881c4d0020000 5f c3 ff15???????? 488d0dae670000 8bd0 }
                                                                                                
        $sequence_15 = { 0f1f840000000000 440fb606 4863cf 488d153a730000 4903ce ff15???????? }
                                                                                    
    condition:
        7 of them and filesize < 123904
}

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

d5a9203d-e2be-4d6f-98e1-e8d3088771eb

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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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