[metadata]
creation_date = "2020/09/02"
maturity = "development"
updated_date = "2020/11/03"

[rule]
author = ["Elastic"]
description = """
Identifies probable exploitation of the Web Proxy Auto-Discovery Protocol (WPAD) service. Attackers who have access to
the local network or upstream DNS traffic can inject malicious JavaScript to the WPAD service which can lead to a full
system compromise.
"""
from = "now-9m"
index = ["logs-endpoint.events.*"]
language = "eql"
license = "Elastic License"
name = "WPAD Service Exploit"
risk_score = 21
rule_id = "ec328da1-d5df-482b-866c-4a435692b1f3"
severity = "high"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Execution"]
type = "eql"

query = '''
/* preference would be to use user.sid rather than domain+name, once it is available in ECS + datasources */
/* didn't trigger successfully during testing */

sequence with maxspan=5s
  [process where event.type in ("start", "process_started") and process.name : "svchost.exe" and
     user.domain == "NT AUTHORITY" and user.name == "LOCAL SERVICE"] by process.entity_id
  [network where network.protocol == "dns" and process.name : "svchost.exe" and
     dns.question.name : "wpad" and process.name : "svchost.exe"] by process.entity_id
  [network where process.name : "svchost.exe"
     and network.direction == "outgoing" and destination.port == 80] by process.entity_id
  [library where event.type == "start" and process.name : "svchost.exe" and
     file.name : "jscript.dll" and process.name : "svchost.exe"] by process.entity_id
  [process where event.type in ("start", "process_started") and
     process.parent.name : "svchost.exe"] by process.parent.entity_id
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1068"
name = "Exploitation for Privilege Escalation"
reference = "https://attack.mitre.org/techniques/T1068/"


[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"