win_r77_auto

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

Detects win.r77.

rule win_r77_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.r77."
        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.r77"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    


    strings:
        $sequence_0 = { 740b 8b0f e8???????? 85c0 }
                                                            
        $sequence_1 = { 740c 8b4f0c e8???????? 85c0 }
                                                            
        $sequence_2 = { 4c8d052ff40000 83e23f 488bcf 48c1f906 }
                                                            
        $sequence_3 = { 6802000080 ffd3 85c0 0f8559010000 8d45f8 50 6819000200 }
                                                                                                
        $sequence_4 = { 4885c0 7432 488b5028 418bcb 448b02 4585c0 }
                                                                                    
        $sequence_5 = { 8945f4 eb0f 8b4dfc 51 e8???????? 83c404 8945f8 }
                                                                                                
        $sequence_6 = { 8945fc 3938 7667 53 8d5e2c 8b0e e8???????? }
                                                                                                
        $sequence_7 = { 488b5730 488b4b30 e8???????? 85c0 }
                                                            
        $sequence_8 = { 488b55c8 4c8d054efd0000 85c0 0f8417010000 }
                                                            
        $sequence_9 = { 0f8593000000 b801000000 c1e000 8b4d08 0fb61401 83fa1f }
                                                                                    
        $sequence_10 = { 394508 7c1f 3934bdf8a00110 7531 }
                                                            
        $sequence_11 = { e9???????? 493bec 0f84b9000000 8b7500 498b9cf670260200 4885db }
                                                                                    
        $sequence_12 = { 488d0541d70000 0f1000 4c8bd9 488d4c2430 0f104810 0f1101 0f104020 }
                                                                                                
        $sequence_13 = { a1???????? 898528fdffff 83bd28fdffff00 7448 8b8d28fdffff 8b5104 }
                                                                                    
    condition:
        7 of them and filesize < 350208
}

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

eaf280d8-68b6-45c5-a367-eff4e7eb5c47

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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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