win_astralocker_auto

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

Detects win.astralocker.

rule win_astralocker_auto {

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

    


    strings:
        $sequence_0 = { 8b440a04 50 8b0c0a 51 e8???????? }
                                                                        
        $sequence_1 = { 8b4dfc 83c102 894dfc 837dfc0a 0f83dc000000 }
                                                                        
        $sequence_2 = { 8b5508 33c0 33f6 89040a 89740a04 c745fc00000000 eb09 }
                                                                                                
        $sequence_3 = { 891401 89740104 b808000000 6bc800 8b5508 8b440a04 50 }
                                                                                                
        $sequence_4 = { 50 8b0c0a 51 e8???????? 83c408 8945ec }
                                                                                    
        $sequence_5 = { c745fc00000000 eb09 8b4dfc 83c102 }
                                                            
        $sequence_6 = { 8b5508 8b440a04 50 8b0c0a 51 }
                                                                        
        $sequence_7 = { 8945ec 8955f0 ba08000000 6bf200 }
                                                            
        $sequence_8 = { e8???????? 83c408 8945ec 8955f0 ba08000000 6bf200 8b45ec }
                                                                                                
        $sequence_9 = { 8b4d08 33d2 33f6 891401 89740104 b808000000 6bc800 }
                                                                                                
    condition:
        7 of them and filesize < 191488
}

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

adf2b5ca-2e66-437e-b60a-c87e53fb5a49

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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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