win_rc2fm_auto

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

Detects win.rc2fm.

rule win_rc2fm_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.rc2fm."
        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.rc2fm"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    


    strings:
        $sequence_0 = { 48898424b8000000 4883f8ff 0f842d010000 4c8d8c2408010000 488d542440 41b805000000 }
                                                                                    
        $sequence_1 = { ff15???????? 4885db 75e5 4d896610 4d896608 458926 400fb6c5 }
                                                                                                
        $sequence_2 = { 488d5558 488b01 ff5028 85c0 0f8831020000 488b4dc0 488d5540 }
                                                                                                
        $sequence_3 = { 4883c210 453bc3 72ec eb03 40b701 49ffca 75c7 }
                                                                                                
        $sequence_4 = { 488b12 488be9 4883c12c 4532ff ff15???????? 33ff 85c0 }
                                                                                                
        $sequence_5 = { 33d2 83c102 ffc0 f7f1 895334 4084ed 7415 }
                                                                                                
        $sequence_6 = { 413baf20020000 0f824affffff eb15 448bc6 ba00000a00 b91b000100 e8???????? }
                                                                                                
        $sequence_7 = { 56 4154 4156 4157 4883ec70 8b9c24c0000000 8bac24e0000000 }
                                                                                                
        $sequence_8 = { 448be0 0f1f840000000000 410fb70476 6683f83a 7521 4084ff 0f8441010000 }
                                                                                                
        $sequence_9 = { 4032ff 84c9 7459 488d542438 488d4c2440 e8???????? }
                                                                                    
    condition:
        7 of them and filesize < 410624
}

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

dae2c660-367b-415c-baea-949a382c4e92

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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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