win_netrepser_keylogger_auto

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

Detects win.netrepser_keylogger.

rule win_netrepser_keylogger_auto {

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

    


    strings:
        $sequence_0 = { 3b45f8 7d6c c785ecfeffff00000000 eb0f 8b8decfeffff 83c101 }
                                                                                    
        $sequence_1 = { 817dfc18030980 7579 6a00 8b4d18 }
                                                            
        $sequence_2 = { 8945fc 6a00 6a01 6a02 e8???????? }
                                                                        
        $sequence_3 = { 034510 034510 8945fc e9???????? }
                                                            
        $sequence_4 = { 8995dcfeffff 6a00 68100e0000 8b95dcfeffff 52 8b85d8feffff 50 }
                                                                                                
        $sequence_5 = { 8b4508 50 ff15???????? e9???????? 8d4de0 51 8b5508 }
                                                                                                
        $sequence_6 = { 52 6a10 6a00 8b45b4 50 6a00 }
                                                                                    
        $sequence_7 = { 52 68e9fd0000 e8???????? 83c40c }
                                                            
        $sequence_8 = { c744240846726565 c744240c5265736f c744241075726365 c744241400000000 ff15???????? }
                                                                        
        $sequence_9 = { 89551c c6452000 6a3f 6a00 }
                                                            
        $sequence_10 = { 8904bd70584000 8b4c2448 5e 5b }
                                                            
        $sequence_11 = { 7537 3905???????? 7509 57 }
                                                            
        $sequence_12 = { e8???????? 83c418 85c0 7662 50 }
                                                                        
        $sequence_13 = { 8975fc 3bc6 0f84f0010000 3bde 0f84e8010000 397570 0f84df010000 }
                                                                                                
        $sequence_14 = { ff15???????? 8b442414 6683f809 7505 bd02000000 5b e8???????? }
                                                                                                
        $sequence_15 = { 51 8d561a 52 c64619b8 e8???????? 83c448 c6461eff }
                                                                                                
    condition:
        7 of them and filesize < 303104
}

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

da60f837-fe99-463a-a95e-c789c15e3fc0

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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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