win_katz_stealer_auto

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

Detects win.katz_stealer.

rule win_katz_stealer_auto {

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

    


    strings:
        $sequence_0 = { 41ffd4 85c0 0f8e8f010000 4898 4889e9 488d157ec20000 c68404101a000000 }
                                                                                                
        $sequence_1 = { 0f85f1feffff 4c89f1 ff15???????? e9???????? 4c89742420 4d89e1 4c8d0508750000 }
                                                                                                
        $sequence_2 = { 8b9c2488000000 4889d7 4c89c6 4d89cb 81fbff1f0000 7751 }
                                                                                    
        $sequence_3 = { 4d85db 0f856e020000 4181f97a000780 7575 4883bc24a000000000 7410 488b442450 }
                                                                                                
        $sequence_4 = { ffd6 41b804010000 488d0d983e0000 488d94249c020000 ffd6 488d442470 4531c0 }
                                                                                                
        $sequence_5 = { 488d942410080000 4889d9 e8???????? 85c0 75ad 4889d9 ff15???????? }
                                                                                                
        $sequence_6 = { 4989d8 488d9424b0130000 e8???????? 488d8c24ac120000 ff15???????? 4d89e1 4c8d0534680000 }
                                                                                                
        $sequence_7 = { 4889d9 e8???????? 488d15eb8b0000 4989f0 4889d1 e8???????? 488d0dd98b0000 }
                                                                                                
        $sequence_8 = { 488d0ddb390000 ffd5 488d0dda390000 488906 ffd5 488d0dce390000 48894608 }
                                                                                                
        $sequence_9 = { ff15???????? 4883660800 488906 4883661000 eb8e 83a424e00e000000 488d9424e00e0000 }
                                                                                                
    condition:
        7 of them and filesize < 238592
}

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

f56a21f3-86cb-4d9c-8aec-a6bc37449c5c

Propose edits, view related rules, and engage with the community through comments.

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 ]]

Community Discussion