win_fuxsocy_auto

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

Detects win.fuxsocy.

rule win_fuxsocy_auto {

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

    


    strings:
        $sequence_0 = { 8975fc 4f 85ff 75b9 8b75f8 5f 8bc6 }
                                                                                                
        $sequence_1 = { 8b5c2410 8bc2 55 8b29 56 8b30 57 }
                                                                                                
        $sequence_2 = { 85c9 7525 8bc7 47 83f814 7f1d ff15???????? }
                                                                                                
        $sequence_3 = { 8b2d???????? d1f8 40 50 }
                                                            
        $sequence_4 = { 85c9 0f8442010000 8d55ec 52 895dec 8b01 6a01 }
                                                                                                
        $sequence_5 = { 50 8d942438020000 e8???????? 668b0d???????? 6a3a 8be8 58 }
                                                                                                
        $sequence_6 = { 8d4618 50 57 8d45fc 68???????? 50 e8???????? }
                                                                                                
        $sequence_7 = { c3 8b0d???????? 85c9 751a 68000000f0 6a18 }
                                                                                    
        $sequence_8 = { 83c018 8bc8 89442438 e8???????? 8bf8 85ff 0f847b010000 }
                                                                                                
        $sequence_9 = { 8b442410 83c60c 47 3bf8 72cd 8b742414 }
                                                                                    
    condition:
        7 of them and filesize < 131072
}

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

2de9f6fe-a790-4a7b-a319-67b348040e12

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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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