win_metastealer_auto

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

Detects win.metastealer.

rule win_metastealer_auto {

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

    


    strings:
        $sequence_0 = { ff75ec 56 e8???????? 83c40c 85c0 755c ffb64c020000 }
                                                                                                
        $sequence_1 = { e9???????? 8b450c c70000000000 5e 5b 5f 8be5 }
                                                                                                
        $sequence_2 = { ff33 e8???????? 8bf8 83c40c 85ff 7412 c64710a5 }
                                                                                                
        $sequence_3 = { f7c300800000 0f8578000000 3b5de4 7317 c745e800000000 85c9 8b4de8 }
                                                                                                
        $sequence_4 = { e9???????? 3d00009942 0f8588010000 8b4318 8bca 8b731c 81e1ff0f0000 }
                                                                                                
        $sequence_5 = { ff730c 68???????? 8d45bc 50 e8???????? 83c428 c645fc10 }
                                                                                                
        $sequence_6 = { ff7320 ff731c 50 e8???????? 83c40c 5f 5e }
                                                                                                
        $sequence_7 = { ff15???????? 83c404 8d7e1c eb14 8b461c 8d7e1c 85c0 }
                                                                                                
        $sequence_8 = { f7d0 23f3 23d0 eb25 85ff 7f0d 7c04 }
                                                                                                
        $sequence_9 = { ff5108 8b472c 50 8b08 ff511c 8bc8 898d70ffffff }
                                                                                                
    condition:
        7 of them and filesize < 26230784
}

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

8a3d018f-eec8-4f7b-a5ab-3947b05c914e

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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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