suspicious_psexec_execution

rule suspicious_psexec_execution {
 meta:
    author = "Samir Bousseaden"
    description = "detects execution of psexec or paexec with renamed service name, this rule helps to filter out the noise if psexec is used for legit purposes or if attacker uses a different psexec client other than sysinternal one  License: https://github.com/Neo23x0/sigma/blob/master/LICENSE.Detection.Rules.md."
    reference = "https://tdm.socprime.com/tdm/info/yTfFXsOGHAF5"
    version = "0.01"
    created = "2021-03-09"
    product = "windows"
    service = "security"
    mitre = "lateral_movement, t1077"

  events:
(($selection1.metadata.product_event_type = "5145" and re.regex($selection1.target.resource.name, `.*\\IPC$`) and (re.regex($selection1.target.file.full_path, `.*-stdin`) or re.regex($selection1.target.file.full_path, `.*-stdout`) or re.regex($selection1.target.file.full_path, `.*-stderr`))) and not ($selection1.metadata.product_event_type = "5145" and re.regex($selection1.target.resource.name, `.*\\IPC$`) and re.regex($selection1.target.file.full_path, `PSEXESVC.*`)))

  condition:
    $selection1
}