win_zeus_mailsniffer_auto

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

Detects win.zeus_mailsniffer.

rule win_zeus_mailsniffer_auto {

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

    


    strings:
        $sequence_0 = { 8b44cde8 a3???????? b001 5f 5e }
                                                                        
        $sequence_1 = { 57 b800070484 7405 b800074484 894dfc 8365fc04 7405 }
                                                                                                
        $sequence_2 = { 66837ddc00 8b87a0902d01 7403 6a29 58 8d8dd4fdffff 51 }
                                                                                                
        $sequence_3 = { 8bf8 85ff 744a 83650800 85db 7435 83c608 }
                                                                                                
        $sequence_4 = { 8bec 81ec1c050000 53 56 8d85f0fcffff 57 33db }
                                                                                                
        $sequence_5 = { 50 68???????? 6815010000 53 }
                                                            
        $sequence_6 = { 8d8424a8070000 50 e8???????? 59 3bc3 }
                                                                        
        $sequence_7 = { 0f8425010000 395df4 0f841c010000 e8???????? }
                                                            
        $sequence_8 = { ff75f0 8945e4 ffd6 68???????? ff75f0 8945d8 }
                                                                                    
        $sequence_9 = { eb70 a80c 7464 8505???????? 745c 8d45e0 50 }
                                                                                                
    condition:
        7 of them and filesize < 368640
}

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

0cf57bfc-b075-4437-a5ba-a909103e6654

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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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