win_bitter_rat_auto

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

Detects win.bitter_rat.

rule win_bitter_rat_auto {

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

    


    strings:
        $sequence_0 = { a3???????? a1???????? 50 8b4dd4 81c1???????? 51 68???????? }
                                                                                                
        $sequence_1 = { 8d8ddcfeffff 51 6a00 6a00 68???????? 8b55e8 52 }
                                                                                                
        $sequence_2 = { 6a05 6a02 6a01 8d45dc 50 8b4df4 51 }
                                                                                                
        $sequence_3 = { ff34c52c3a4500 53 57 e8???????? 83c40c 85c0 740d }
                                                                                                
        $sequence_4 = { 8b8dacfeffff 51 e8???????? 83c408 8bf4 8d85a0feffff 50 }
                                                                                                
        $sequence_5 = { e8???????? 50 ff15???????? 3bf4 e8???????? 8945f4 6a00 }
                                                                                                
        $sequence_6 = { ff36 e8???????? 8b06 8bd0 83e01f c1fa05 8b149500124700 }
                                                                                                
        $sequence_7 = { 83c404 898530ecffff 8d450c 898524ecffff 8b8524ecffff 50 8b4d08 }
                                                                                                
        $sequence_8 = { 8b8d14ffffff 894dec a1???????? 50 }
                                                            
        $sequence_9 = { eb9c 8b45e4 52 8bcd 50 8d1578bf4100 e8???????? }
                                                                                                
    condition:
        7 of them and filesize < 1130496
}

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

aed86ea7-95ce-4492-89db-a07795b4b460

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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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