win_jaff_auto

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

Detects win.jaff.

rule win_jaff_auto {

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

    


    strings:
        $sequence_0 = { 83c418 4e 79cc 837f0400 5e }
                                                                        
        $sequence_1 = { 8d4c0701 51 6a08 ff15???????? 50 ff15???????? 8bf0 }
                                                                                                
        $sequence_2 = { 81ec08040000 56 57 33ff 8bf1 897e04 c6460c01 }
                                                                                                
        $sequence_3 = { c745c40a000000 c645c801 ffd3 50 ffd7 }
                                                                        
        $sequence_4 = { 8d4dfc 51 52 50 56 ffd7 }
                                                                                    
        $sequence_5 = { 7408 3c38 7404 3c39 754a 8845fc 8d45fc }
                                                                                                
        $sequence_6 = { 66891c3a 83c202 49 79f0 50 6a00 ff15???????? }
                                                                                                
        $sequence_7 = { 0f85b0000000 68080000f0 6a18 57 57 8d4dfc }
                                                                                    
        $sequence_8 = { 8b4f04 83ec10 8bf4 894e04 8b5708 8bca }
                                                                                    
        $sequence_9 = { 83fe0a 7438 8a8c3598fbffff 8d55fc }
                                                            
    condition:
        7 of them and filesize < 106496
}

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

4a9b867f-c55c-422e-8d43-e54688aba61b

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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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