win_opachki_auto

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

Detects win.opachki.

rule win_opachki_auto {

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

    


    strings:
        $sequence_0 = { c64401ff00 8b4608 85c0 7410 }
                                                            
        $sequence_1 = { 897d0c 7422 8bd7 2bd7 035508 837d0c00 742e }
                                                                                                
        $sequence_2 = { 8bd8 7413 8b4704 03c8 }
                                                            
        $sequence_3 = { c706???????? 894608 89460c 894604 e8???????? 8bc6 }
                                                                                    
        $sequence_4 = { 6a01 c645ff01 49 81e1feffff3f }
                                                            
        $sequence_5 = { c3 55 8bec 81ec00010000 ff7508 }
                                                                        
        $sequence_6 = { 81ec20010000 53 56 68ff000000 8d85e0feffff }
                                                                        
        $sequence_7 = { 52 51 50 56 ff15???????? 85c0 0f9545ff }
                                                                                                
        $sequence_8 = { 80fd01 7502 b701 80fd02 750a 08db }
                                                                                    
        $sequence_9 = { 7702 88da 88c6 80e603 }
                                                            
        $sequence_10 = { ad 894721 eb3f 08d2 7408 }
                                                                        
        $sequence_11 = { e8???????? 59 81c157010000 3c0f 7509 }
                                                                        
        $sequence_12 = { 08ed 7405 80fd02 7502 b704 4e 80ff01 }
                                                                                                
        $sequence_13 = { 7505 884702 ebe9 3c2e 7414 }
                                                                        
        $sequence_14 = { 884701 ebf2 3cf0 7505 }
                                                            
    condition:
        7 of them and filesize < 122880
}

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

27c35772-f44f-4fe8-9285-a11c47083bcb

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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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