win_skipper_auto

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

Detects win.skipper.

rule win_skipper_auto {

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

    


    strings:
        $sequence_0 = { 6a03 68???????? 68???????? 6a50 }
                                                            
        $sequence_1 = { ff15???????? 6a00 6a00 6a00 6a00 68???????? 68???????? }
                                                                                                
        $sequence_2 = { e8???????? 6804010000 e8???????? 6804010000 8bf8 6a00 57 }
                                                                                                
        $sequence_3 = { 6a00 6a00 6a00 50 ff15???????? 53 8bf0 }
                                                                                                
        $sequence_4 = { 83c428 8d4601 90 8a0e }
                                                            
        $sequence_5 = { b9???????? e8???????? 83c428 53 56 }
                                                                        
        $sequence_6 = { 46 8a01 888435fbfeffff 8811 81fe00010000 7cb1 8b750c }
                                                                                                
        $sequence_7 = { 57 ff15???????? 6804010000 6a00 57 e8???????? 57 }
                                                                                                
        $sequence_8 = { 83c404 6a00 6a64 52 }
                                                            
        $sequence_9 = { 8a95e4feffff 88940df0feffff ebd0 c785e8feffff00000000 c785e0feffff00000000 eb0f }
                                                                                    
        $sequence_10 = { 888deffeffff 0fb695e8feffff 8b85e0feffff 8a8c15f0feffff }
                                                            
        $sequence_11 = { 408832 4181f900010000 7c9a 488bdd 85ed }
                                                                        
        $sequence_12 = { 0fb695e8feffff 8a85effeffff 888415f0feffff e9???????? c785dcfeffff00000000 eb0f }
                                                                                    
        $sequence_13 = { 55 8bec 81ec24010000 a1???????? 33c5 8945f4 c745f800000000 }
                                                                                                
        $sequence_14 = { 4c03c0 410fb6c2 450fb608 4803d0 0fb602 }
                                                                        
        $sequence_15 = { 81bde0feffff00010000 0f8d84000000 8b8de0feffff 0fb68c0df0feffff }
                                                            
        $sequence_16 = { 7d0d 41ffca 4181ca00ffffff 41ffc2 0fb6c1 4c8d0424 488d1424 }
                                                                                                
        $sequence_17 = { 488d1424 448bd1 8bc1 0f1f840000000000 8802 ffc0 488d5201 }
                                                                                                
        $sequence_18 = { 8b4d10 038ddcfeffff 0fbe11 0fb685eefeffff 33d0 8b4d18 }
                                                                                    
        $sequence_19 = { 4833c4 4889842400010000 4c8b9c2440010000 33c9 }
                                                            
        $sequence_20 = { 48897c2420 4156 4881ec10010000 488b05???????? 4833c4 }
                                                                        
        $sequence_21 = { 7908 49 81c900ffffff 41 898de8feffff 8b85e0feffff 8a8c05f0feffff }
                                                                                                
        $sequence_22 = { 41ffc1 4803d0 48ffc3 0fb602 }
                                                            
        $sequence_23 = { ffc0 488d5201 3d00010000 7cf1 448bc1 448bc9 488d1c24 }
                                                                                                
        $sequence_24 = { 8955fc 0fb645f8 8a8c05f0feffff 888deffeffff 0fb655fc 0fb645f8 8a8c15f0feffff }
                                                                                                
        $sequence_25 = { 8810 33ff 8d5001 8b048d606d4100 47 4e 807d1300 }
                                                                                                
        $sequence_26 = { ff95dcfeffff 8985ecfeffff 6800800000 6804010000 8b85d8feffff 50 }
                                                                                    
        $sequence_27 = { d85223 000453 2300 285323 0023 d18a0688078a 46 }
                                                                                                
        $sequence_28 = { 33f6 488d1de8a30000 8d7e24 837b0801 7522 4863c6 }
                                                                                    
        $sequence_29 = { 68???????? ff15???????? 8b3d???????? 85c0 0f84e4000000 6a39 }
                                                                                    
        $sequence_30 = { 8d8ddcfeffff 8d5101 8a01 41 }
                                                            
        $sequence_31 = { 488d05c3910000 483bc8 7405 e8???????? bf0d000000 8bcf }
                                                                                    
        $sequence_32 = { 0f84bc020000 488d059bac0000 4a8b04e8 41f644040880 0f84a5020000 }
                                                                        
        $sequence_33 = { c745e4a06c4100 a1???????? 33db 43 895de0 }
                                                                        
        $sequence_34 = { 8b45e0 8b0485606d4100 f644180401 7428 57 e8???????? }
                                                                                    
        $sequence_35 = { 3d00010000 7d10 8a8c181d010000 8888b0a52300 40 ebe6 ff35???????? }
                                                                                                
        $sequence_36 = { 59 8945e4 8b7508 c7465cd8812300 }
                                                            
        $sequence_37 = { e8???????? 488d053bae0000 488903 488bc3 }
                                                            
        $sequence_38 = { 488d4dbc 4c8d0509980000 488d0c41 41b903000000 488bc1 492bc6 48d1f8 }
                                                                                                
        $sequence_39 = { 50 ff15???????? 8985d0feffff c785e0feffff00000000 8b0d???????? 898ddcfeffff }
                                                                                    
        $sequence_40 = { 0f8463010000 488d2d05f00000 41bf14030000 4c8d0518980000 }
                                                            
        $sequence_41 = { 7d10 668b4c4310 66890c4590b22300 40 }
                                                            
        $sequence_42 = { 8d34f570a02300 391e 7404 8bc7 eb6e }
                                                                        
        $sequence_43 = { 8b95e4feffff 52 ff15???????? 8985d8feffff 6a00 6804010000 8d85f0feffff }
                                                                                                
        $sequence_44 = { 72ed 48833d????????00 741f 488d0d4a140100 e8???????? 85c0 740f }
                                                                                                
        $sequence_45 = { 4883ec20 4883610800 488d05529c0000 c6411000 }
                                                            
    condition:
        7 of them and filesize < 262144
}

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

4013f765-ad16-4f10-9ae3-11f95b9c52d9

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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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