win_rcs_auto

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

Detects win.rcs.

rule win_rcs_auto {

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

    


    strings:
        $sequence_0 = { ff15???????? 5f 5e 5d 5b 33c0 }
                                                                                    
        $sequence_1 = { 89442456 8944245a 8944245e 89442462 89442466 8944246a }
                                                                                    
        $sequence_2 = { 6a01 6a00 6a05 6800000040 }
                                                            
        $sequence_3 = { 40 68???????? 50 e8???????? 83c40c eb0d }
                                                                                    
        $sequence_4 = { 85ff 0f84d4000000 57 e8???????? }
                                                            
        $sequence_5 = { e8???????? 83c430 6aff 68???????? }
                                                            
        $sequence_6 = { 894710 8b7d08 8b37 81c62c010000 }
                                                            
        $sequence_7 = { 0508070000 50 ff96b8000000 43 }
                                                            
        $sequence_8 = { 81f560444c06 2ac5 66c1e73b 8dadc4402771 660fce }
                                                                        
        $sequence_9 = { 8906 8b7d10 833fff 750a b800000000 e9???????? 8b7d10 }
                                                                                                
        $sequence_10 = { 742e 8b7d08 ff5768 89c7 }
                                                            
        $sequence_11 = { 83fdff 750d b801000000 5d }
                                                            
        $sequence_12 = { 83bd6cffffff01 750d 8b87dc000000 c7401401000000 }
                                                            
        $sequence_13 = { 8bb814120000 8b9548f4fbff 83c205 0fb7949070020000 }
                                                            
        $sequence_14 = { 83fdff 7467 57 8b3d???????? f684241402000010 }
                                                                        
        $sequence_15 = { 81f57e566901 03fd 8dad03dc03da 0fbff6 }
                                                            
        $sequence_16 = { 8d85dafffbff 50 6809000200 8d85e3fffdff }
                                                            
        $sequence_17 = { 50 ff968c000000 ffb570f4fbff ffb588f4fbff }
                                                            
    condition:
        7 of them and filesize < 11501568
}

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

9dc36352-8206-43c5-bb7b-63e1bc94ad13

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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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