win_vskimmer_auto

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

Detects win.vskimmer.

rule win_vskimmer_auto {

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

    


    strings:
        $sequence_0 = { 8b1d???????? be???????? 85c0 740c 6a00 56 56 }
                                                                                                
        $sequence_1 = { 7524 8b4728 85c0 7421 8b4dfc 81c12c020000 }
                                                                                    
        $sequence_2 = { 8d45b8 897e14 895e10 50 8bce c745fc02000000 881e }
                                                                                                
        $sequence_3 = { 85c0 7443 8d85f8feffff 68???????? 50 }
                                                                        
        $sequence_4 = { 770e 6a0d 58 5d c3 8b04cd74494200 }
                                                                                    
        $sequence_5 = { 32c0 5d c20400 55 8bec 807d0861 7504 }
                                                                                                
        $sequence_6 = { e8???????? 6803010000 8d85edfeffff 57 50 }
                                                                        
        $sequence_7 = { e8???????? 33f6 56 e8???????? 83c420 56 6a01 }
                                                                                                
        $sequence_8 = { e8???????? 57 53 8d8dc8f6ffff e8???????? 57 }
                                                                                    
        $sequence_9 = { ff7508 ff0d???????? ff15???????? 8b0d???????? 89048de0654200 }
                                                                        
    condition:
        7 of them and filesize < 376832
}

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

11210f86-f4e6-415c-997f-e3fcc8f5a64d

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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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