win_karsto_rat_auto

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

Detects win.karsto_rat.

rule win_karsto_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.karsto_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.karsto_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 = { 8bca 83e207 48c1e903 420fb60401 0fabd0 42880401 488bcb }
                                                                                                
        $sequence_1 = { 7603 488b36 4d8d442401 488bd6 4b8d0c3e e8???????? 488b5c2478 }
                                                                                                
        $sequence_2 = { 7407 4188442409 eb04 4d892c24 41c644240801 498b0424 4885db }
                                                                                                
        $sequence_3 = { 483bce 741c ff15???????? 488b06 48634804 4803ce ff15???????? }
                                                                                                
        $sequence_4 = { 458801 448bc2 85d2 75d6 4c8d85cd040000 498bd1 488d4dc0 }
                                                                                                
        $sequence_5 = { 488d4c2460 e8???????? 0f1000 0f11442440 0f104810 0f114c2450 4c896810 }
                                                                                                
        $sequence_6 = { 760b 4c8bf7 4d2bf7 eb03 4d8bf4 49ffc0 488d4f1c }
                                                                                                
        $sequence_7 = { 4c8d442440 48837c24580f 4c0f47442440 448b4c2450 498bd4 }
                                                                        
        $sequence_8 = { 488b550f 4c2bc2 49c1f804 e8???????? b301 488d4d0f e8???????? }
                                                                                                
        $sequence_9 = { 7409 80f97d 0f8577010000 884378 0fbec0 89437c }
                                                                                    
    condition:
        7 of them and filesize < 336896
}

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

fa274ec6-9422-491e-8f30-e7ea620a639f

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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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