uac_bypass_via_event_viewer

rule uac_bypass_via_event_viewer {
 meta:
    author = "Florian Roth"
    description = "Detects UAC bypass method using Windows event viewer  License: https://github.com/Neo23x0/sigma/blob/master/LICENSE.Detection.Rules.md."
    reference = "https://tdm.socprime.com/tdm/info/EIBSd85RV69M"
    version = "0.01"
    created = "2021-03-09"
    product = "windows"
    service = "sysmon"
    mitre = "defense_evasion, privilege_escalation, t1088"

  events:
(($methregistry.metadata.product_event_type = "13" and re.regex($methregistry.target.registry.registry_key, `HKEY_USERS\\.*\\mscfile\\shell\\open\\command`)) or (($methregistry.metadata.product_event_type = "1" and re.regex($methregistry.principal.process.file.full_path, `.*\\eventvwr\.exe`)) and not (re.regex($methregistry.target.process.file.full_path, `.*\\mmc\.exe`))))

  condition:
    $methregistry
}