win_mofksys_auto

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

Detects win.mofksys.

rule win_mofksys_auto {

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

    


    strings:
        $sequence_0 = { ff15???????? c7859cfaffff60e04200 eb0a c7859cfaffff60e04200 8b859cfaffff 8b08 8b959cfaffff }
                                                                                                
        $sequence_1 = { 50 8b45d8 50 e8???????? 898540fdffff ff15???????? 8d8d00fcffff }
                                                                                                
        $sequence_2 = { 8bf8 8b07 8b4d10 8b11 6bd20f }
                                                                        
        $sequence_3 = { beff0f0000 2bf2 3bf0 7208 ffd3 8b0d???????? 8bc6 }
                                                                                                
        $sequence_4 = { ff15???????? 8b55b8 89951cffffff c745b800000000 6a00 6aff 8d45a8 }
                                                                                                
        $sequence_5 = { 8d5594 52 ff15???????? 8b4d94 85c9 7426 66833901 }
                                                                                                
        $sequence_6 = { ff15???????? c745fc13000000 ff15???????? 8945c4 c745bc08000000 8d55bc 52 }
                                                                                                
        $sequence_7 = { 8bd0 8d4dd0 ffd6 8d459c 8d4da0 50 8d55a4 }
                                                                                                
        $sequence_8 = { ff15???????? 83bd40fdffff00 0f8595f8ffff c745fc3a000000 8b4dd8 51 e8???????? }
                                                                                                
        $sequence_9 = { e9???????? 668b8558f8ffff 6603c2 0f80e50f0000 8bd0 899508fdffff e9???????? }
                                                                                                
    condition:
        7 of them and filesize < 401408
}

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

eafca8c4-8368-479e-bb82-eaddd9691219

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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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