win_emotet_auto

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

Detects win.emotet.

rule win_emotet_auto {

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

    


    strings:
        $sequence_0 = { 7c04 3c7a 7e0b 3c41 7c04 3c5a }
                                                                                    
        $sequence_1 = { 3c39 7e13 3c61 7c04 3c7a 7e0b }
                                                                                    
        $sequence_2 = { 3c41 7c04 3c5a 7e03 c60158 41 }
                                                                                    
        $sequence_3 = { 8a01 3c30 7c04 3c39 7e13 3c61 }
                                                                                    
        $sequence_4 = { 33c0 3903 5f 5e 0f95c0 5b 8be5 }
                                                                                                
        $sequence_5 = { c60158 41 803900 75dd }
                                                            
        $sequence_6 = { 83c020 eb03 0fb7c0 69d23f000100 }
                                                            
        $sequence_7 = { 8d5204 c1e910 8842fd 884afe }
                                                            
        $sequence_8 = { 880a 8bc1 c1e808 8d5204 c1e910 }
                                                                        
        $sequence_9 = { 8d5801 f6c30f 7406 83e3f0 83c310 }
                                                                        
        $sequence_10 = { 894dcc 8d4dc8 8945c8 8975d4 }
                                                            
        $sequence_11 = { 6a04 50 ff760c 8d45fc }
                                                            
        $sequence_12 = { ff15???????? 017758 83c40c 29775c 8b477c }
                                                                        
        $sequence_13 = { 56 50 8b4774 03878c000000 50 ff15???????? }
                                                                                    
        $sequence_14 = { 7448 8b00 2b878c000000 56 }
                                                            
        $sequence_15 = { 8bf1 ff15???????? 8b17 83c40c }
                                                            
        $sequence_16 = { c745fc04000000 50 8d45f8 81ca00000020 50 52 }
                                                                                    
        $sequence_17 = { 418808 0fb7c1 c1e910 66c1e808 4d8d4004 418840fd }
                                                                                    
        $sequence_18 = { 48895010 4c894018 4c894820 c3 }
                                                            
        $sequence_19 = { 4803c8 eb08 803900 7408 48ffc9 }
                                                                        
        $sequence_20 = { 488bd3 488bcf 488b5c2460 4883c450 }
                                                            
        $sequence_21 = { 2bca d1e9 03ca c1e906 894d20 }
                                                                        
        $sequence_22 = { 418bd0 d3e2 418bcb d3e0 03d0 }
                                                                        
        $sequence_23 = { d3e7 83f841 7208 83f85a 7703 }
                                                                        
        $sequence_24 = { 483bd8 730b 488bcb e8???????? 488bd8 }
                                                                        
        $sequence_25 = { 4d8d4004 418840fd 418848fe 66c1e908 418848ff 4d3bd9 }
                                                                                    
        $sequence_26 = { c1e807 41 83f87f 77f7 }
                                                            
        $sequence_27 = { 84c0 75f2 eb03 c60100 }
                                                            
        $sequence_28 = { f7e1 b84fecc44e 2bca d1e9 }
                                                            
        $sequence_29 = { 7907 83c107 3bf7 72e8 }
                                                            
        $sequence_30 = { 83c104 894e04 8b00 85c0 }
                                                            
        $sequence_31 = { 52 52 52 68???????? 52 }
                                                                        
        $sequence_32 = { 83ec48 53 56 57 6a44 }
                                                                        
        $sequence_33 = { 56 57 6a1e 8d45e0 }
                                                            
        $sequence_34 = { 83f87f 760d 8d642400 c1e807 }
                                                            
        $sequence_35 = { b901000000 83f87f 7609 c1e807 41 }
                                                                        
        $sequence_36 = { 6a00 6aff 50 51 ff15???????? }
                                                                        
        $sequence_37 = { 50 6a00 6a01 6a00 ff15???????? a3???????? }
                                                                                    
        $sequence_38 = { 53 56 8bf1 bb00c34c84 }
                                                            
        $sequence_39 = { 50 6a00 ff75fc 6800040000 6a00 6a00 6a00 }
                                                                                                
        $sequence_40 = { 68400000f0 6a18 33f6 56 }
                                                            
        $sequence_41 = { 83ec08 56 68400000f0 6a18 }
                                                            
        $sequence_42 = { 50 56 6800800000 6a6a }
                                                            
        $sequence_43 = { 51 ff75f8 50 6a03 6a30 }
                                                                        
        $sequence_44 = { 8b466c 5f 5e 5b 8be5 5d }
                                                                                    
        $sequence_45 = { 8bec 83ec08 56 57 8bf1 33ff }
                                                                                    
        $sequence_46 = { 6a00 6a03 6a00 6a00 ff7508 53 }
                                                                                    
        $sequence_47 = { 8bf1 bb00c34c84 57 33ff }
                                                            
        $sequence_48 = { 00b807000000 008b45fc33d2 00b871800780 00558b }
                                                            
        $sequence_49 = { 8b55e0 01ca 89d6 83c604 8b7de0 }
                                                                        
        $sequence_50 = { 8b8880000000 8b55f4 01ca 89d6 83c60c }
                                                                        
        $sequence_51 = { 08fb f6c301 89f0 8945a4 }
                                                            
        $sequence_52 = { 8b4510 8b4d0c 8b5508 befbffffff c600e8 29d6 01ce }
                                                                                                
        $sequence_53 = { 83ec10 53 6a00 8d45fc }
                                                            
        $sequence_54 = { 8b7020 8b7840 89c3 83c33c }
                                                            
        $sequence_55 = { ff15???????? 83f803 7405 83f802 751e }
                                                                        
        $sequence_56 = { 31f6 89720c 897208 897204 }
                                                            
        $sequence_57 = { e8???????? 84c0 7519 33c9 }
                                                            
        $sequence_58 = { 33d2 c605????????00 0fb6d8 e8???????? }
                                                            
        $sequence_59 = { 743e 8b5c2430 85db 741d }
                                                            
        $sequence_60 = { 31c9 89e2 31f6 89720c }
                                                            
        $sequence_61 = { 7519 33c9 0f1f4000 0fb6840c30010000 }
                                                            
        $sequence_62 = { 8bf8 e8???????? eb04 8b7c2430 }
                                                            
        $sequence_63 = { 89842488000000 89e8 83c03c 89842484000000 8b453c 89842480000000 89e8 }
                                                                                                
        $sequence_64 = { 8d15e70f0000 e8???????? 84c0 0f84f1000000 48 899c2480030000 }
                                                                                    
        $sequence_65 = { 89542404 894c2418 e8???????? 8b4c2420 890c24 8b542430 }
                                                                                    
        $sequence_66 = { c744240802000000 8954240c 8b54246c 894c2434 ffd2 83ec10 31c9 }
                                                                                                
        $sequence_67 = { 89723c c7424004000000 c7424402920000 c7424800d00000 8b7c2418 }
                                                                        
        $sequence_68 = { 488bf9 7505 e8???????? 488bd3 488bcf }
                                                                        
        $sequence_69 = { 488bf2 488bd9 488d152c1b0000 488bce }
                                                            
        $sequence_70 = { 8b442444 890424 f20f11442410 e8???????? 31c9 }
                                                                        
        $sequence_71 = { b8000011c0 885dff e8???????? 8bf0 83feff 0f8492000000 }
                                                                                    
    condition:
        7 of them and filesize < 733184
}

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

b80d15c7-ca24-4880-9cfd-c6982a323c98

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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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