win_bistromath_auto

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

Detects win.bistromath.

rule win_bistromath_auto {

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

    


    strings:
        $sequence_0 = { ffd3 8b5724 83c410 8b0f e8???????? 0f10442418 8b442450 }
                                                                                                
        $sequence_1 = { e8???????? 6a00 57 ba38000000 e8???????? 83c438 8b7c2428 }
                                                                                                
        $sequence_2 = { c78530ffffff65007400 c78534ffffff43006f00 c78538ffffff6f006b00 c7853cffffff69006500 c78540ffffff73005c00 c78544ffffff4c006f00 c78548ffffff77000000 }
                                                                                                
        $sequence_3 = { c7411000000000 8801 8b44242c 894104 c6410100 8b742418 8b442420 }
                                                                                                
        $sequence_4 = { 8bd7 e8???????? 8b7dbc 8d4301 57 50 ba17000000 }
                                                                                                
        $sequence_5 = { c3 55 8bec 81ec040a0000 a1???????? 33c5 8945fc }
                                                                                                
        $sequence_6 = { eb1c 8b8564ffffff eb11 8b8d60ffffff 8bd6 53 e8???????? }
                                                                                                
        $sequence_7 = { c78518ffffff7b003300 c7851cffffff43004300 c78520ffffff44003500 c78524ffffff34003900 c78528ffffff39002d00 c7852cffffff38003700 c78530ffffff41003800 }
                                                                                                
        $sequence_8 = { e8???????? 85f6 0f4475d0 eb03 8b7dc4 8b55d4 8b45bc }
                                                                                                
        $sequence_9 = { eb03 8b4510 46 3b750c 7cca 8b55fc 8b4d08 }
                                                                                                
    condition:
        7 of them and filesize < 33816576
}

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

6d25e3eb-4ca4-42d2-bc91-8a041fe39400

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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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