win_rarstar_auto

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

Detects win.rarstar.

rule win_rarstar_auto {

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

    


    strings:
        $sequence_0 = { 745f 50 c705????????01000000 e8???????? }
                                                            
        $sequence_1 = { 8a1c29 8d4601 25ff000080 7907 48 }
                                                                        
        $sequence_2 = { 3bee 0f8485000000 8b442410 8bfd }
                                                            
        $sequence_3 = { 53 56 57 8365d800 c745dc94254000 }
                                                                        
        $sequence_4 = { c3 395c2414 7405 be01000000 }
                                                            
        $sequence_5 = { 81ce00ffffff 46 89b42424030000 8a10 8d743420 }
                                                                        
        $sequence_6 = { c1e902 83e203 83f908 7229 f3a5 ff2495c86c4000 8bc7 }
                                                                                                
        $sequence_7 = { 55 56 57 b940000000 33c0 8d7c2424 }
                                                                                    
        $sequence_8 = { 745f 50 c705????????01000000 e8???????? 8b742424 8bc8 d1e1 }
                                                                                                
        $sequence_9 = { 8d4c2424 51 8d942484000000 6800100000 52 50 ffd5 }
                                                                                                
    condition:
        7 of them and filesize < 122880
}

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

85cc840d-a431-49c7-af3e-67f286a45b72

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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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