win_upas_auto

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

Detects win.upas.

rule win_upas_auto {

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

    


    strings:
        $sequence_0 = { 57 e8???????? f7d8 1bf6 53 57 }
                                                                                    
        $sequence_1 = { 7508 83c8ff e9???????? 56 e8???????? 59 8945f8 }
                                                                                                
        $sequence_2 = { 8b4508 83c040 5d c3 55 8bec 8b4d0c }
                                                                                                
        $sequence_3 = { 50 8d8548feffff 50 8d4520 50 53 e8???????? }
                                                                                                
        $sequence_4 = { 85c0 0f84d9000000 33c0 8945e8 85ff 0f8ecc000000 }
                                                                                    
        $sequence_5 = { ff750c 8d45b8 50 e8???????? 8b45b8 }
                                                                        
        $sequence_6 = { 8d45cc 50 ff75f8 ff75ec ff15???????? }
                                                                        
        $sequence_7 = { 50 ff15???????? 33c0 5f 5e 5b 83c568 }
                                                                                                
        $sequence_8 = { 57 53 e9???????? 8b4514 8b1d???????? 57 6a08 }
                                                                                                
        $sequence_9 = { ff75e0 8d45ec 50 8d45f8 }
                                                            
    condition:
        7 of them and filesize < 114688
}

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

d8ab1f34-5cce-4c83-a516-ff22f7e5fad5

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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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