win_grayrabbit_auto

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

Detects win.grayrabbit.

rule win_grayrabbit_auto {

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

    


    strings:
        $sequence_0 = { 8b3403 85f6 7464 8b7df0 8d4de0 c645fc01 }
                                                                                    
        $sequence_1 = { eb3a 81fb00100000 7227 8d4323 3bc3 0f86cd000000 50 }
                                                                                                
        $sequence_2 = { 8b7810 8bc6 2bc2 57 51 3bf8 7722 }
                                                                                                
        $sequence_3 = { 51 83c108 e8???????? 8b4604 5e 85c0 740b }
                                                                                                
        $sequence_4 = { 0f84e8000000 8b04951c550410 898588f8ffff 85c0 0f84ad000000 3bc3 0f84cb000000 }
                                                                                                
        $sequence_5 = { 8bc8 e8???????? 8b45d4 894610 8d45d8 50 8d4e14 }
                                                                                                
        $sequence_6 = { 3b4f14 7d1b 84c0 0f84cf000000 8d4101 8903 8d45ec }
                                                                                                
        $sequence_7 = { 8bc8 83e03f c1f906 6bd038 8b0c8df8630510 804c112802 5b }
                                                                                                
        $sequence_8 = { 8a12 56 8d42df 3c5d 7605 80fa80 7253 }
                                                                                                
        $sequence_9 = { e8???????? 895df0 8b4d08 8b4918 8bd9 894d08 85c9 }
                                                                                                
    condition:
        7 of them and filesize < 744448
}

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

39604343-1000-4fef-bb6c-7724bf8eaf21

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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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