win_blackmatter_auto

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

Detects win.blackmatter.

rule win_blackmatter_auto {

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

    


    strings:
        $sequence_0 = { 50 8d851cffffff 50 8d45f8 50 6a00 8d45dc }
                                                                                                
        $sequence_1 = { ebe7 837de400 7408 ff75e4 }
                                                            
        $sequence_2 = { ff75e8 ff75ec e8???????? 803d????????00 }
                                                            
        $sequence_3 = { 50 ff15???????? 83c404 8bf8 8d047d02000000 50 8d85fcfeffff }
                                                                                                
        $sequence_4 = { 8d3c3e 57 ff15???????? eb05 }
                                                            
        $sequence_5 = { e8???????? 8945fc eb0c 83c702 ff4df8 837df800 }
                                                                                    
        $sequence_6 = { 817e043f005c00 0f85c2010000 c745f400000000 8d45f4 50 6a40 57 }
                                                                                                
        $sequence_7 = { 7409 83f802 0f857c010000 e8???????? }
                                                            
        $sequence_8 = { 7502 eb65 53 ff15???????? 83c404 8d3443 }
                                                                                    
        $sequence_9 = { ff7508 ff35???????? e8???????? 85c0 0f8545020000 e8???????? }
                                                                                    
    condition:
        7 of them and filesize < 194560
}

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

e8311ac1-b53f-475d-9932-150ab857b043

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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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