win_tinyloader_auto

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

Detects win.tinyloader.

rule win_tinyloader_auto {

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

    


    strings:
        $sequence_0 = { 5b 89d0 c1c010 6689c8 90 }
                                                                        
        $sequence_1 = { 8b1d???????? 90 8998f8070000 90 }
                                                            
        $sequence_2 = { 7402 eb42 8b4500 83c00c }
                                                            
        $sequence_3 = { 8985a0050000 0500200000 8985a8050000 0500080000 894508 }
                                                                        
        $sequence_4 = { ff15???????? 48 83c420 48 83ec20 48 8d0dea0e0000 }
                                                                                                
        $sequence_5 = { 83c420 c705????????00010000 48 83ec20 }
                                                            
        $sequence_6 = { 750a c783000400000c000000 8b8540050000 8b5d00 894308 8b85f8070000 8b5d00 }
                                                                                                
        $sequence_7 = { 90 48 895830 90 48 8b1d???????? }
                                                                                    
        $sequence_8 = { ff15???????? 8985b8050000 6832a00000 ff15???????? }
                                                            
        $sequence_9 = { 48 c7c200800200 49 c7c000300000 }
                                                            
        $sequence_10 = { 50 ff95b0020000 83bd4005000001 7502 }
                                                            
        $sequence_11 = { 8b4500 8b8000040000 83f80c 7702 eb28 83e80c 39c3 }
                                                                                                
        $sequence_12 = { 90 8b1d???????? 90 895838 90 }
                                                                        
        $sequence_13 = { 0500080000 894508 0500200000 894518 0500200000 894510 }
                                                                                    
        $sequence_14 = { 6a00 ff15???????? 90 8b1d???????? }
                                                            
        $sequence_15 = { 90 6a40 6800300000 6800800200 6a00 ff15???????? }
                                                                                    
        $sequence_16 = { 81fb68040000 730d 90 48 }
                                                            
        $sequence_17 = { 6800040000 53 ffb5b8050000 ff15???????? 83f8ff }
                                                                        
        $sequence_18 = { 89c6 90 0500400100 90 31db 90 90 }
                                                                                                
        $sequence_19 = { ff15???????? 8d3500304000 89c7 53 }
                                                            
        $sequence_20 = { 895838 90 48 89c6 90 48 0500400100 }
                                                                                                
        $sequence_21 = { 6c 00ff 15???????? e8???????? 53 68656c6c45 }
                                                                                    
    condition:
        7 of them and filesize < 40960
}

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

43329c02-b510-4f52-bf35-044d2625afa1

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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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