win_xiaoba_auto

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

Detects win.xiaoba.

rule win_xiaoba_auto {

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

    


    strings:
        $sequence_0 = { 897e38 897e3c 66c746402a00 897e44 897e48 897e4c c7465064000000 }
                                                                                                
        $sequence_1 = { 0f8408000000 8b45f4 e9???????? 6802000080 6a00 6800000000 6a00 }
                                                                                                
        $sequence_2 = { 8b16 6a11 57 6aff 50 8bce ff5268 }
                                                                                                
        $sequence_3 = { 8bf9 56 ff15???????? 8b476c 83e800 0f8498000000 }
                                                                                    
        $sequence_4 = { e9???????? 8a5101 88542440 8b4c2440 81e1ff000000 668b144d00a55f00 8b4c2414 }
                                                                                                
        $sequence_5 = { 741e 8bce 57 33c0 8d7a08 c1e902 c70201000000 }
                                                                                                
        $sequence_6 = { 3bc8 0f8f85010000 6a01 6803000000 6a01 6801000000 e8???????? }
                                                                                                
        $sequence_7 = { 68???????? 56 e8???????? 83c408 8b4e7c 81e1???????? 81f900002000 }
                                                                                                
        $sequence_8 = { db45f8 dd5dc4 dd45cc dc65c4 dc1d???????? dfe0 f6c401 }
                                                                                                
        $sequence_9 = { 51 68d8070000 c744241c06000000 c744243800000000 c744243c00000000 c744242002000000 89542424 }
                                                                                                
    condition:
        7 of them and filesize < 5177344
}

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

4534323f-c0b8-459e-88f6-d56a800cdfb5

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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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