win_tinyfluff_auto

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

Detects win.tinyfluff.

rule win_tinyfluff_auto {

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

    


    strings:
        $sequence_0 = { c1ff06 6bd838 8b04bd50704100 f644032801 7444 837c0318ff 743d }
                                                                                                
        $sequence_1 = { 89861c020000 8b45e0 8d4e0c 6a06 8d9094644100 }
                                                                        
        $sequence_2 = { c1f906 6bf638 8b0c8d50704100 80643128fd }
                                                            
        $sequence_3 = { 6bf038 03348d50704100 837e18ff 740c 837e18fe 7406 804e2880 }
                                                                                                
        $sequence_4 = { e8???????? 8904bd50704100 85c0 7514 6a0c }
                                                                        
        $sequence_5 = { 57 8d3c85506d4100 8b07 83ceff }
                                                            
        $sequence_6 = { 8b4c2450 8d145502000000 8bc1 81fa00100000 7214 }
                                                                        
        $sequence_7 = { 83f801 0f82f0010000 83bdbcfbffff08 8d85a8fbffff }
                                                            
        $sequence_8 = { e8???????? 83c408 8b94240c010000 83fa08 7236 8b8c24f8000000 }
                                                                                    
        $sequence_9 = { 750e 8b04bd50704100 807c302900 741d 8d45fc 50 }
                                                                                    
    condition:
        7 of them and filesize < 245760
}

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

cbc7ba35-0937-41dd-a3e8-431d3422713f

Propose edits, view related rules, and engage with the community through comments.

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 ]]

Community Discussion