win_matryoshka_rat_auto

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

Detects win.matryoshka_rat.

rule win_matryoshka_rat_auto {

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

    


    strings:
        $sequence_0 = { b06f c3 b063 c3 }
                                                            
        $sequence_1 = { b037 c3 b073 c3 }
                                                            
        $sequence_2 = { 8b55ec 730c 891e 8d7204 }
                                                            
        $sequence_3 = { 750d 66833b2e 7407 32c0 }
                                                            
        $sequence_4 = { 8b55ec 51 50 ff762c }
                                                            
        $sequence_5 = { 750d 8b442440 c1e008 03c6 }
                                                            
        $sequence_6 = { 8b55ec 3bcf 8b7de8 7443 }
                                                            
        $sequence_7 = { 750d b800000100 8905???????? eb75 }
                                                            
        $sequence_8 = { 8b55e8 8bc8 2b0a 8a55ff }
                                                            
        $sequence_9 = { 750d b9f7ff0000 6623c1 6689442444 8b5584 488bcf }
                                                                                    
        $sequence_10 = { 750d 4d890e 33c0 44890b e9???????? 448b13 }
                                                                                    
        $sequence_11 = { 8b55ec 3bc8 0f42c8 8d04bb }
                                                            
        $sequence_12 = { 8b55ec 891488 eb36 8b5d0c }
                                                            
        $sequence_13 = { 750d 8b442440 c1e018 03c3 8906 }
                                                                        
    condition:
        7 of them and filesize < 843776
}

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

b745fa38-7a31-4145-b731-4efe803302e5

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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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