SUSP_Hunt_EvtMuteHook_Memory

YARA detection rule by SBousseaden · NOASSERTION

Memory hunt for default wevtsv EtwEventCallback hook pattern to apply to eventlog svchost memory dump

rule SUSP_Hunt_EvtMuteHook_Memory {
    meta:
        description = "Memory hunt for default wevtsv EtwEventCallback hook pattern to apply to eventlog svchost memory dump"
        reference = "https://blog.dylan.codes/pwning-windows-event-logging/"
        author = "SBousseaden"
        date = "2020-09-05"
        score = 70
        id = "5326581e-90d9-59b9-8dc5-74df97571600"
    strings:
        $a = {49 BB ?? ?? ?? ?? ?? ?? ?? ?? 41 FF E3 54 24 20 4C 8B 05 61 CB 1A 00 0F 57 C0 66 0F 7F 44 24 20 E8 5B 0A 00 00 48 83 C4 38 C3}
        $b = {48 83 EC 38 4C 8B 0D 65 CB 1A 00 48 8D 54 24 20 4C 8B 05 61 CB 1A 00 0F 57 C0 66 0F 7F 44 24 20 E8 5B 0A 00 00 48 83 C4 38 C3}
    condition: 
        $a and not $b
}

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

46cca505-3973-47a7-9ccb-19fbdb2f9c35

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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

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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.

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

[[ currentRule.title ]]

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