win_jimmy_auto

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

Detects win.jimmy.

rule win_jimmy_auto {

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

    


    strings:
        $sequence_0 = { 8b450c 8b4df8 8908 eb11 e8???????? }
                                                                        
        $sequence_1 = { 8945f0 a1???????? 83786800 741c 6a00 6a00 8d45e8 }
                                                                                                
        $sequence_2 = { c745fc12030900 e9???????? 837de805 752c ff75e4 8b4508 8b4028 }
                                                                                                
        $sequence_3 = { 7402 eb10 8b45e8 40 8945e8 8b45e4 40 }
                                                                                                
        $sequence_4 = { 85c0 7428 ff7514 ff75dc e8???????? 59 }
                                                                                    
        $sequence_5 = { 50 e8???????? 59 ffb580fdffff e8???????? 59 85c0 }
                                                                                                
        $sequence_6 = { 8b45ec 0fb600 48 50 8b45f0 ff30 e8???????? }
                                                                                                
        $sequence_7 = { 59 0fb6c0 85c0 7418 6a00 ff75f4 }
                                                                                    
        $sequence_8 = { e8???????? 59 59 8945fc ff7508 8d45f0 50 }
                                                                                                
        $sequence_9 = { 740d 817dfc18030980 0f85ac000000 8b4508 8b4d08 8b402c 3b4128 }
                                                                                                
    condition:
        7 of them and filesize < 188416
}

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

795d60a3-25a7-4187-a3cd-b31c3fc9eb06

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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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