certutil_activity_via_proxy

rule certutil_activity_via_proxy {
 meta:
    author = "Joseph Kamau"
    description = "This rule can be used to hunt for Living of the Land activity from certutil from proxy server logs.  License: https://github.com/Neo23x0/sigma/blob/master/LICENSE.Detection.Rules.md."
    reference = "https://tdm.socprime.com/tdm/info/E64jgRkkRkTS"
    version = "0.01"
    created = "2021-03-09"
    product = "proxy"
    mitre = "command&control, T1105, defense-evasion, T1140"

  events:
($selection.principal.application = "CertUtil URL Agent" or re.regex($selection.principal.application, `Microsoft-CryptoAPI/.*`))

  condition:
    $selection
}