win_cruloader_auto

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

Detects win.cruloader.

rule win_cruloader_auto {

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

    


    strings:
        $sequence_0 = { a3???????? 33c9 e8???????? ba4d822ee6 33c9 e8???????? }
                                                                                    
        $sequence_1 = { 83c408 85c0 0f8540040000 ba4d822ee6 33c9 e8???????? }
                                                                                    
        $sequence_2 = { 83e13f c1f806 6bc938 8b0485d85e4100 0fb6440828 }
                                                                        
        $sequence_3 = { 8d1c85505e4100 8b03 90 8b15???????? 83cfff 8bca 33d0 }
                                                                                                
        $sequence_4 = { 56 57 8b7d08 eb6f 8b07 8d1c85605c4100 }
                                                                                    
        $sequence_5 = { 89049d90624100 43 81fb00010000 0f8c5cffffff }
                                                            
        $sequence_6 = { 41 0fbfc1 3bc6 72dd 8b7a04 03d7 8b7a04 }
                                                                                                
        $sequence_7 = { 53 56 57 33c9 0f1145ec e8???????? }
                                                                                    
        $sequence_8 = { ddd8 db2d???????? b802000000 833d????????00 0f85b00d0000 8d0db02f4100 ba1b000000 }
                                                                                                
        $sequence_9 = { 3bf8 7210 8b8508fdffff 42 83c128 3bd0 }
                                                                                    
    condition:
        7 of them and filesize < 196608
}

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

c092837b-b7a5-4ca9-9017-305fe2f8f477

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