win_keylogger_apt3_auto

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

Detects win.keylogger_apt3.

rule win_keylogger_apt3_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.keylogger_apt3."
        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.keylogger_apt3"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    


    strings:
        $sequence_0 = { 8b0d???????? 8d842414010000 50 51 e8???????? }
                                                                        
        $sequence_1 = { a3???????? eb0a c705????????00000000 8b15???????? 68???????? 52 }
                                                                                    
        $sequence_2 = { 52 a3???????? ff15???????? 8b0d???????? 8d44240c 50 }
                                                                                    
        $sequence_3 = { 8d83d8010000 50 81c1c8000000 51 ffd6 8b15???????? 8b82e8000000 }
                                                                                                
        $sequence_4 = { 8810 897008 897010 89700c 0514010000 03cf }
                                                                                    
        $sequence_5 = { c705????????00000000 8b15???????? 68???????? 52 ff15???????? }
                                                                        
        $sequence_6 = { 7e25 be???????? 90 837e04ff 750e 8b0e 394c2414 }
                                                                                                
        $sequence_7 = { 75f9 2bc2 8be8 3bfd }
                                                            
        $sequence_8 = { 68???????? 52 ffd7 8b0d???????? 8d442438 50 }
                                                                                    
        $sequence_9 = { 6888020000 bf01000000 e8???????? a1???????? 83c404 }
                                                                        
    condition:
        7 of them and filesize < 761856
}

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

0d3f7489-03d9-471c-a5f6-f1ecefed9dae

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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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