win_cueisfry_auto

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

Detects win.cueisfry.

rule win_cueisfry_auto {

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

    


    strings:
        $sequence_0 = { c3 8b4c2418 8d442408 50 }
                                                            
        $sequence_1 = { 8d8424a4020000 50 6804010000 ff15???????? }
                                                            
        $sequence_2 = { 66ab 8d4c242c 6800010000 51 6a00 aa }
                                                                                    
        $sequence_3 = { 7541 397dec 750a 6803400080 }
                                                            
        $sequence_4 = { 889c24c0010000 e8???????? 83c40c 85c0 7f37 8d4c2414 }
                                                                                    
        $sequence_5 = { 8d45c8 50 c645fc01 ff15???????? 3bc7 }
                                                                        
        $sequence_6 = { 8bee 33ff 85c9 89542430 896c2410 0f8ebd010000 }
                                                                                    
        $sequence_7 = { c3 8b45ec c745fcffffffff 85c0 7406 8b10 }
                                                                                    
        $sequence_8 = { 64890d00000000 81c4b4070000 c3 8b8c24c0070000 8d442408 }
                                                                        
        $sequence_9 = { 50 8975dc e8???????? 8b45ec }
                                                            
    condition:
        7 of them and filesize < 81920
}

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

aaee5f53-6840-4c16-971b-f83e4952fc6c

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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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