win_unidentified_099_auto

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

Detects win.unidentified_099.

rule win_unidentified_099_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.unidentified_099."
        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.unidentified_099"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    


    strings:
        $sequence_0 = { 488d15a9b00000 488d0d9ab00000 e8???????? 488b4308 833800 7516 c605????????01 }
                                                                                                
        $sequence_1 = { 418bcb 4123ca f7d0 23c3 0bc1 }
                                                                        
        $sequence_2 = { e8???????? 4c8d0d31450100 4c8bc0 b201 }
                                                            
        $sequence_3 = { 48894c0420 b808000000 486bc001 488b0d???????? 48894c0420 488d0db5f40000 }
                                                                                    
        $sequence_4 = { 488bd9 488bc2 488d0d6dec0000 48890b 488d5308 33c9 48890a }
                                                                                                
        $sequence_5 = { 4c8d45d0 488d15c67f0100 488d4dd0 e8???????? b904010000 e8???????? 4c8be0 }
                                                                                                
        $sequence_6 = { 420fb68c3248ea0100 4883c203 880f 488d7f01 4883fa27 }
                                                                        
        $sequence_7 = { 85c0 0f84f5000000 488d35fcf8ffff ff15???????? 39442454 0f85ba000000 }
                                                                                    
        $sequence_8 = { 488bd0 4889442460 48894c2468 48894c2470 448d4918 }
                                                                        
        $sequence_9 = { 4885c0 0f8416050000 b910000000 e8???????? 4c8bd0 }
                                                                        
    condition:
        7 of them and filesize < 314368
}

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

2db792c9-5360-4d77-9b78-de4d683784a8

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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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