win_ragnarok_auto

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

Detects win.ragnarok.

rule win_ragnarok_auto {

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

    


    strings:
        $sequence_0 = { 8bc1 888c0dfcfeffff 99 f7fe 8a8415fcfdffff 88840dfcfcffff 41 }
                                                                                                
        $sequence_1 = { 8a8090914200 8841fc 83ea01 75ec 43 836df801 75d5 }
                                                                                                
        $sequence_2 = { 895d10 0fb691104b4300 8bcb c1e910 0fb6c9 }
                                                                        
        $sequence_3 = { 23ca 8bd3 338decfeffff 03f9 0b95e8feffff 03b87cc14200 03bc0500ffffff }
                                                                                                
        $sequence_4 = { 8855ff 83e900 7465 83e901 743d 83e901 }
                                                                                    
        $sequence_5 = { 03d9 13f8 8b8538fdffff 031cc580af4200 133cc584af4200 039cc5a4fdffff }
                                                                                    
        $sequence_6 = { 85f6 7433 6a00 56 ff95c4feffff 56 ff95c8feffff }
                                                                                                
        $sequence_7 = { 0fb689104b4300 33f9 c1e708 8b4dfc c1e908 0fb6c9 0fb689104b4300 }
                                                                                                
        $sequence_8 = { 51 ff35???????? ffd3 6a17 ff35???????? 8bf0 e8???????? }
                                                                                                
        $sequence_9 = { 57 8b7d0c 8d347d01000000 56 e8???????? 8bd8 83c404 }
                                                                                                
    condition:
        7 of them and filesize < 483328
}

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

56355d45-6316-45ea-9f25-d41ce9b3f21c

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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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