win_kamasers_auto

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

Detects win.kamasers.

rule win_kamasers_auto {

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

    


    strings:
        $sequence_0 = { 83f81f 7732 e9???????? 6a00 6a00 6a00 6a00 }
                                                                                                
        $sequence_1 = { e8???????? 6a05 e8???????? 6a06 c705????????feffff7f e8???????? 6a00 }
                                                                                                
        $sequence_2 = { 8b4da4 8d45d4 8b55a0 c745fc01000000 837de80f 0f4745d4 8b12 }
                                                                                                
        $sequence_3 = { 8d4594 0f474594 6a00 6800800000 50 6a00 8d45ac }
                                                                                                
        $sequence_4 = { ba02000000 85c0 8b45c8 0f44f2 }
                                                            
        $sequence_5 = { 668901 884102 0fb602 343f 8801 0fb64201 343f }
                                                                                                
        $sequence_6 = { c745fc0e000000 81c900080000 898d70feffff 6810270000 6a01 8d458c c645fc10 }
                                                                                                
        $sequence_7 = { e8???????? 8d8d04d9ffff c645fc02 83bdf4ecffff07 8d85e0ecffff 51 0f4785e0ecffff }
                                                                                                
        $sequence_8 = { 50 8d45f4 64a300000000 8bf9 89bd34feffff 89bd6cfeffff 89bd6cfeffff }
                                                                                                
        $sequence_9 = { 83c408 c785f8fdffff11000000 81ce00020000 898dfcfdffff 33d2 0f1100 }
                                                                                    
    condition:
        7 of them and filesize < 906240
}

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

87c8813a-3388-482e-b99d-28c161ddf93f

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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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