win_expiro_auto

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

Detects win.expiro.

rule win_expiro_auto {

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

    


    strings:
        $sequence_0 = { 73f8 7ed3 92 6363ea 848a4ab40f64 }
                                                                        
        $sequence_1 = { 8b742424 33ff 897c2410 33c0 c7461407000000 897e10 }
                                                                                    
        $sequence_2 = { f9 94 73fa 037324 7373 }
                                                                        
        $sequence_3 = { 66891448 8bc6 5d c20800 8bc6 33d2 66891448 }
                                                                                                
        $sequence_4 = { 8bf9 33c0 bd07000000 33c9 88442417 c7442418a85f4100 }
                                                                                    
        $sequence_5 = { 42 74de 8b6c2418 8bc8 2b4c240c 83caff }
                                                                                    
        $sequence_6 = { e8???????? 57 ff15???????? 83bc248c00000008 }
                                                            
        $sequence_7 = { 0fb77dc4 b814000000 8b4df8 99 f7f9 89c1 }
                                                                                    
        $sequence_8 = { 7407 50 ff15???????? 8ac3 e9???????? 57 ff15???????? }
                                                                                                
        $sequence_9 = { 50 83c8ff e8???????? 8bc5 8d5002 668b08 83c002 }
                                                                                                
    condition:
        7 of them and filesize < 3776512
}

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

c5b1d448-d94d-4bc0-8392-38e5cdb1379c

Propose edits, view related rules, and engage with the community through comments.

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 ]]

Community Discussion