win_minifast_auto

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

Detects win.minifast.

rule win_minifast_auto {

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

    


    strings:
        $sequence_0 = { 8b08 81f187000000 81f187000000 48b8365e1d1f4d10db70 480305???????? 8908 48b8365e1d1f4d10db70 }
                                                                                                
        $sequence_1 = { 89c8 4421c0 09c3 83f3ff 81f3447a9651 81e3447a9651 b8ffffffff }
                                                                                                
        $sequence_2 = { 48b9e98f99ea57c6dc4e 4829c8 488985d0000000 4883bd1801000000 7505 e9???????? 48b8dc5b9dd112100499 }
                                                                                                
        $sequence_3 = { 80f2ff 80e2d0 4180e1ff 4508d0 4408ca 4130d0 4188f9 }
                                                                                                
        $sequence_4 = { e9???????? 8b05???????? 8944240c 8b0d???????? 89ca 83e2ff 4189d0 }
                                                                                                
        $sequence_5 = { ffd0 4c8b442420 488b4c2428 4889c2 49b96a7540380775b1cc 4c030d???????? 48b8a5c1773d4be9680e }
                                                                                                
        $sequence_6 = { b2ff 80f222 4188f2 4180f2ff 41b0ff 4180f01a 4188d1 }
                                                                                                
        $sequence_7 = { ffd0 4883c420 488b4550 48833800 0f95c0 88455f 48b8a6953f852b4c1be0 }
                                                                                                
        $sequence_8 = { 80f2ff 80e2d7 41b2ff 4180f2d7 4520d3 41b0ff 4180f0ff }
                                                                                                
        $sequence_9 = { 8b1401 88d1 440fb6d9 4489d9 4869c925499224 48c1e920 4189c9 }
                                                                                                
    condition:
        7 of them and filesize < 5141504
}

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

536013d0-f4fe-4d0f-8652-85f313b684a2

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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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