win_mrac_auto

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

Detects win.mrac.

rule win_mrac_auto {

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

    


    strings:
        $sequence_0 = { 3473 8d8c2448030000 6a05 88842454030000 e8???????? 3474 8d8c2448030000 }
                                                                                                
        $sequence_1 = { e8???????? 0473 8d8c2438010000 6a30 88842440010000 e8???????? }
                                                                                    
        $sequence_2 = { 64a300000000 6a02 68???????? e8???????? 68???????? c745fc00000000 }
                                                                                    
        $sequence_3 = { e8???????? 346e 8d8c24d8150000 6a01 888424e0150000 e8???????? 3465 }
                                                                                                
        $sequence_4 = { e8???????? 0474 8d4c2410 6a04 88442416 e8???????? }
                                                                                    
        $sequence_5 = { 343d 8885e1fbffff 8b85a8fbffff 0436 3475 8885e2fbffff 8b85a8fbffff }
                                                                                                
        $sequence_6 = { c68424531300005d c68424541300000d c68424551300007b c684245613000048 c684245713000048 c68424581300004c c684245913000040 }
                                                                                                
        $sequence_7 = { 8d8c2480010000 6a66 88842491010000 e8???????? 0472 8d8c2480010000 6a66 }
                                                                                                
        $sequence_8 = { 3445 88442417 8b442408 040c 3450 88442418 8b442408 }
                                                                                                
        $sequence_9 = { 0420 6a05 8d8c24f4000000 888424fc000000 e8???????? 0477 8d8c24f0000000 }
                                                                                                
    condition:
        7 of them and filesize < 745472
}

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

158bba83-74f4-4f26-bb0a-5de395a5b78c

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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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