win_croxloader_auto

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

Detects win.croxloader.

rule win_croxloader_auto {

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

    


    strings:
        $sequence_0 = { 4803ce 488bd7 e8???????? 4533db 498bd3 4c8d051f66ffff 4b8b8ce010970100 }
                                                                                                
        $sequence_1 = { 488d442450 48897c2448 41b940000000 4889442420 48c7c1ffffffff }
                                                                        
        $sequence_2 = { 7542 8d58b0 498bce 448bc3 488d1520750000 e8???????? }
                                                                                    
        $sequence_3 = { e8???????? 4c8d05dd880100 badab3f10d b95595db6d }
                                                            
        $sequence_4 = { 488d05be1c0100 483bc8 7405 e8???????? c70301000000 488bcb 488b4530 }
                                                                                                
        $sequence_5 = { 4053 4883ec20 8bd9 4c8d0db1ad0000 b902000000 }
                                                                        
        $sequence_6 = { 0f1f440000 4d8b5a60 bb05150000 450fb74a58 498bc3 440fb600 }
                                                                                    
        $sequence_7 = { b906000000 4c8d05277c0000 e8???????? 488bd3 8bcf }
                                                                        
        $sequence_8 = { 0f8ee0000000 4b8b84e710970100 4c8b45af 4c2bc7 420fb64cf03e }
                                                                        
        $sequence_9 = { 0f8ee0000000 4b8b84e710970100 4c8b45af 4c2bc7 420fb64cf03e 460fbebc39c0880100 41ffc7 }
                                                                                                
    condition:
        7 of them and filesize < 241664
}

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

40e18845-14b6-4032-a62c-4332d89d852f

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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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