win_zhcat_auto

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

Detects win.zhcat.

rule win_zhcat_auto {

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

    


    strings:
        $sequence_0 = { e8???????? 8b45f8 8945b4 8b45f4 83c40c }
                                                                        
        $sequence_1 = { 7353 8bc1 c1f805 8bf1 83e61f 8d3c8540604100 }
                                                                                    
        $sequence_2 = { 8b4dfc 83c40c 894104 3975e4 }
                                                            
        $sequence_3 = { 8d45c8 50 8d45e8 50 68???????? 57 }
                                                                                    
        $sequence_4 = { 56 8d34c590444100 833e00 7513 50 }
                                                                        
        $sequence_5 = { 5f ff750c 8bc7 33db 668945e0 ffd6 668945e2 }
                                                                                                
        $sequence_6 = { 1bf6 8d7df8 895df4 83e6c2 }
                                                            
        $sequence_7 = { 59 eb61 8b06 8b4dfc 897d0c 8bf8 }
                                                                                    
        $sequence_8 = { 8bf0 897510 83feff 0f849e000000 }
                                                            
        $sequence_9 = { 59 59 83fe01 7409 895cb5f4 e9???????? }
                                                                                    
    condition:
        7 of them and filesize < 376832
}

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

4bf86889-c8e9-4411-8910-2910a2636d76

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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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