win_grease_auto

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

Detects win.grease.

rule win_grease_auto {

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

    


    strings:
        $sequence_0 = { 52 50 683f000f00 50 50 }
                                                                        
        $sequence_1 = { 4889442438 48897c2430 4533c0 c74424283f000f00 }
                                                            
        $sequence_2 = { 488d542470 41b93f000f00 4533c0 48c7c102000080 }
                                                            
        $sequence_3 = { 4533c9 4533c0 c74424283f000f00 897c2420 }
                                                            
        $sequence_4 = { 488b4c2460 ff15???????? b801000000 488b8c2480020000 4833cc }
                                                                        
        $sequence_5 = { 488b05???????? 4833c4 4889842480020000 488d4c2472 }
                                                            
        $sequence_6 = { 85c0 0f85e7000000 488b4c2460 488d442458 }
                                                            
        $sequence_7 = { 48c7c102000080 c74424281f000200 895c2420 ff15???????? 85c0 0f85e7000000 }
                                                                                    
        $sequence_8 = { 7534 488b4c2450 488d442458 41b904000000 4533c0 488bd3 }
                                                                                    
        $sequence_9 = { 6a00 50 c644241400 e8???????? 8b0d???????? 51 8d542418 }
                                                                                                
        $sequence_10 = { 6802000080 ffd7 85c0 7544 8b442410 }
                                                                        
        $sequence_11 = { 8d8c2424060000 33ff 85c9 8d842424060000 740c }
                                                                        
        $sequence_12 = { 68???????? 52 897c2430 ffd5 8b442410 50 ffd6 }
                                                                                                
        $sequence_13 = { 8d84240d010000 6a00 50 c684241401000000 e8???????? 0fbe4c2410 }
                                                                                    
        $sequence_14 = { 8dbc24410d0000 f3ab 8b0d???????? 8b15???????? 66ab aa }
                                                                                    
        $sequence_15 = { 81ec0c020000 a1???????? 33c4 89842408020000 e8???????? 68???????? }
                                                                                    
        $sequence_16 = { e9???????? c684342c0800003d e9???????? c684342c0800005f e9???????? }
                                                                        
        $sequence_17 = { 8dbc2419030000 f3ab 66ab b9???????? }
                                                            
        $sequence_18 = { 75f4 33f6 8a843410010000 33c9 3c41 }
                                                                        
        $sequence_19 = { ffd5 8d442424 8d5001 8a08 83c001 3acb 75f7 }
                                                                                                
        $sequence_20 = { eb67 c644340c25 eb60 c644340c2a }
                                                            
        $sequence_21 = { 50 ffd6 8d4c2418 68???????? 51 }
                                                                        
        $sequence_22 = { c684342807000068 e9???????? c684342807000078 e9???????? c684342807000063 }
                                                                        
    condition:
        7 of them and filesize < 278528
}

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

4815a4fe-ec25-4701-a5fd-d06dfae1295e

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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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