win_coreshell_auto

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

Detects win.coreshell.

rule win_coreshell_auto {

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

    


    strings:
        $sequence_0 = { 6810270000 ff15???????? be06000000 e8???????? }
                                                            
        $sequence_1 = { be06000000 e8???????? 85c0 7401 4e }
                                                                        
        $sequence_2 = { 56 ff15???????? 83c40c 3bc6 }
                                                            
        $sequence_3 = { 68???????? 52 ffd7 ffd0 }
                                                            
        $sequence_4 = { c20400 50 a1???????? 6a00 50 }
                                                                        
        $sequence_5 = { 6804010000 6a08 8b15???????? 52 ff15???????? a3???????? }
                                                                                    
        $sequence_6 = { 57 6a08 51 ff15???????? 8bf8 85ff }
                                                                                    
        $sequence_7 = { 8d041e 50 57 6a08 }
                                                            
        $sequence_8 = { 8b0d???????? 8b15???????? 6a01 51 68???????? 52 }
                                                                                    
        $sequence_9 = { 50 ff15???????? 83c404 32db }
                                                            
        $sequence_10 = { 50 a3???????? ffd6 a3???????? a1???????? }
                                                                        
        $sequence_11 = { 8d4c2400 56 51 6a00 }
                                                            
        $sequence_12 = { 7402 eb14 c745f000000000 68e0930400 }
                                                            
        $sequence_13 = { 8bf1 8b4604 85c0 7407 50 ff15???????? 8b36 }
                                                                                                
        $sequence_14 = { ff15???????? ffd0 85c0 7508 ff15???????? }
                                                                        
        $sequence_15 = { a3???????? a1???????? 68???????? 50 ffd6 6a00 }
                                                                                    
        $sequence_16 = { 8b0d???????? 52 50 57 68???????? }
                                                                        
        $sequence_17 = { 6800080000 8d85fcefffff 50 ff15???????? }
                                                            
        $sequence_18 = { 50 ffd6 6a00 6a00 6a00 68???????? }
                                                                                    
        $sequence_19 = { 03cf 880431 fec3 ebe6 }
                                                            
        $sequence_20 = { 52 e8???????? 83c408 33c0 8b4df0 64890d00000000 5f }
                                                                                                
        $sequence_21 = { ff15???????? 50 68???????? 6800080000 8d85fcefffff }
                                                                        
        $sequence_22 = { 81e1ffff0000 81e1ffff0000 81e1ff000000 81e1ff000000 }
                                                            
        $sequence_23 = { 52 a1???????? 50 68???????? 8b0d???????? 51 ff15???????? }
                                                                                                
        $sequence_24 = { e8???????? 8945e4 6888130000 ff15???????? }
                                                            
        $sequence_25 = { 6888130000 ff15???????? c745f000000000 c745f400000000 }
                                                            
        $sequence_26 = { 51 ff15???????? ba00080000 2bd0 52 8d85fcefffff 50 }
                                                                                                
        $sequence_27 = { 81e2ffff0000 81e2ffff0000 c1ea08 81e2ff000000 }
                                                            
        $sequence_28 = { 8b8dd8edffff 51 8d95f4edffff 52 }
                                                            
        $sequence_29 = { 51 ff15???????? ffd0 8945fc }
                                                            
        $sequence_30 = { 25ffff0000 0fb7c8 c1e908 81e1ff000000 0fb6d1 52 }
                                                                                    
        $sequence_31 = { e8???????? 8be8 8b442410 50 e8???????? }
                                                                        
        $sequence_32 = { 56 51 56 6a01 }
                                                            
        $sequence_33 = { ffd6 ffd0 68???????? a3???????? }
                                                            
        $sequence_34 = { ff15???????? 0305???????? 50 ff15???????? a1???????? 83c418 }
                                                                                    
        $sequence_35 = { a3???????? ffd7 8bd8 68???????? 53 ffd6 }
                                                                                    
        $sequence_36 = { 690006000000 0306 8b4dcc 8b09 }
                                                            
        $sequence_37 = { 29d6 01f0 a3???????? e9???????? }
                                                            
        $sequence_38 = { 29d6 0faff0 31d2 f7f6 }
                                                            
        $sequence_39 = { 8908 8b15???????? 89d6 81c609000000 }
                                                            
        $sequence_40 = { 57 8b3d???????? 68???????? ffd7 8b35???????? 68???????? 50 }
                                                                                                
        $sequence_41 = { bf04010000 57 6a08 ff35???????? ff15???????? }
                                                                        
        $sequence_42 = { 53 a3???????? ffd6 68???????? a3???????? }
                                                                        
        $sequence_43 = { 5f 5b 5d c3 b81c000000 e8???????? 89e0 }
                                                                                                
        $sequence_44 = { 6689fb 0fb7fb c1ef08 81e7ff000000 }
                                                            
        $sequence_45 = { 8908 8b00 8b5004 8b35???????? }
                                                            
        $sequence_46 = { 5f 5d c3 89e0 c70010270000 }
                                                                        
    condition:
        7 of them and filesize < 303100
}

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

02cd80fd-ea1f-411b-9b19-dbe9b5ee61d8

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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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