win_downex_auto

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

Detects win.downex.

rule win_downex_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.downex."
        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.downex"
        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???????? 8b437c 83c408 85c0 7418 0f1f00 8bb008080000 }
                                                                                                
        $sequence_1 = { eb77 ffb570f8ffff 68???????? 53 e8???????? 83c40c 83bd6cf8ffff64 }
                                                                                                
        $sequence_2 = { 8981d0010100 3d00080000 7311 53 e8???????? 83c404 }
                                                                                    
        $sequence_3 = { e8???????? 83e00f 56 0fb680b8b64600 8845ca e8???????? 6a07 }
                                                                                                
        $sequence_4 = { ff36 57 e8???????? 83c414 5e 85c0 7409 }
                                                                                                
        $sequence_5 = { 83c404 52 50 57 e8???????? 83c414 57 }
                                                                                                
        $sequence_6 = { ff7520 884803 ff751c c6400400 8d442418 50 8d442424 }
                                                                                                
        $sequence_7 = { 8b450c 83ee01 7597 8b45fc 5f 5b 5e }
                                                                                                
        $sequence_8 = { 0f8fc4000000 7c09 3945f8 0f87b9000000 8b960c030000 85d2 745b }
                                                                                                
        $sequence_9 = { 8b849ff0000000 8d149f 83c404 85c0 740c 8b08 5f }
                                                                                                
    condition:
        7 of them and filesize < 1067008
}

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

fb5493a4-04c3-444b-a37d-d9bc3d2a0d62

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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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