win_felismus_auto

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

Detects win.felismus.

rule win_felismus_auto {

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

    


    strings:
        $sequence_0 = { f3ab 8bca 83e103 f3aa 8b442410 33ff a9f0ffffff }
                                                                                                
        $sequence_1 = { 55 e8???????? 8bfd 83c9ff 33c0 83c408 }
                                                                                    
        $sequence_2 = { ff15???????? 85c0 6800040000 7464 e8???????? 8b5514 83c404 }
                                                                                                
        $sequence_3 = { ff15???????? 8b4c2470 51 55 56 8d4c241c e8???????? }
                                                                                                
        $sequence_4 = { 56 ffd7 8d54241c 6a00 52 6a01 68???????? }
                                                                                                
        $sequence_5 = { 57 ffd3 55 ffd3 8b542430 52 ffd3 }
                                                                                                
        $sequence_6 = { 50 ffd7 6a04 6800100000 6814030000 6a00 56 }
                                                                                                
        $sequence_7 = { 50 68???????? eb4b 8d4c2458 51 ffd7 }
                                                                                    
        $sequence_8 = { 53 55 56 57 6800040000 e8???????? 6800040000 }
                                                                                                
        $sequence_9 = { c6432a23 c6432b20 f2ae f7d1 }
                                                            
    condition:
        7 of them and filesize < 204800
}

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

65341c9f-6ed0-4a6f-9e9d-74d6d4fe1a9e

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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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