win_stegoloader_auto

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

Detects win.stegoloader.

rule win_stegoloader_auto {

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

    


    strings:
        $sequence_0 = { 8b5204 8b5208 85d2 7405 895128 fec0 }
                                                                                    
        $sequence_1 = { 8a09 ff442414 48 880a 75eb 89742408 }
                                                                                    
        $sequence_2 = { eb02 33f6 3bf3 7477 8b06 53 }
                                                                                    
        $sequence_3 = { 50 8d45f4 50 8b4508 53 53 ff5008 }
                                                                                                
        $sequence_4 = { 53 53 6a04 53 53 c70044000000 c7402c01000000 }
                                                                                                
        $sequence_5 = { 50 ff75f4 8d45e8 50 83c604 }
                                                                        
        $sequence_6 = { 8945ec e8???????? 8b7d08 33f6 8945f0 }
                                                                        
        $sequence_7 = { 59 747c 56 57 6a14 e8???????? }
                                                                                    
        $sequence_8 = { c645f36c c645f46c c645f500 56 }
                                                            
        $sequence_9 = { c645e874 c645e972 c645ea6f c645eb6c c645ec5f }
                                                                        
        $sequence_10 = { eb0c 895804 895808 897e24 897e28 897e20 }
                                                                                    
        $sequence_11 = { d1e9 741b 85c0 741b 8b542414 8b742414 }
                                                                                    
        $sequence_12 = { 84c0 7414 ff75ec 8b3d???????? }
                                                            
        $sequence_13 = { 8b4004 6a40 8945f8 6800300000 8d45f8 50 }
                                                                                    
        $sequence_14 = { 85db 59 59 7417 57 56 e8???????? }
                                                                                                
        $sequence_15 = { 8bec 81ec0c020000 53 8d85f4fdffff }
                                                            
    condition:
        7 of them and filesize < 802816
}

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

85ffe5a2-4a0b-48f4-9458-02056f19ed2d

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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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