[New Rule] Potential Local NTLM Relay via HTTP (#1947)

* [New Rule] Potential Local NTLM Relay via HTTP

Detect attempt to elevate privileges via coercing a privileged service to connect to a local rogue HTTP endpoint, leading to NTLM relay, example of logs while testing https://github.com/med0x2e/NTLMRelay2Self (step 5):

* Update credential_access_relay_ntlm_auth_via_http_spoolss.toml

* Update credential_access_relay_ntlm_auth_via_http_spoolss.toml

Co-authored-by: Colson Wilhoit <48036388+DefSecSentinel@users.noreply.github.com>

rules/windows/credential_access_relay_ntlm_auth_via_http_spoolss.toml

@@ -0,0 +1,52 @@
+[metadata]
+creation_date = "2022/04/30"
+maturity = "production"
+updated_date = "2022/04/30"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies attempt to coerce a local NTLM authentication via HTTP using the Windows Printer Spooler service as a target.
+An adversary may use this primitive in combination with other techniques to elevate privileges on a compromised system.
+"""
+from = "now-9m"
+index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
+language = "eql"
+license = "Elastic License v2"
+name = "Potential Local NTLM Relay via HTTP"
+references = [
+    "https://github.com/med0x2e/NTLMRelay2Self",
+    "https://github.com/topotam/PetitPotam",
+    "https://github.com/dirkjanm/krbrelayx/blob/master/printerbug.py",
+]
+risk_score = 73
+rule_id = "4682fd2c-cfae-47ed-a543-9bed37657aa6"
+severity = "high"
+tags = ["Elastic", "Host", "Windows", "Threat Detection", "Credential Access"]
+type = "eql"
+
+query = '''
+process where event.type in ("start", "process_started") and
+  process.name : "rundll32.exe" and
+  
+  /* Rundll32 WbeDav Client  */
+  process.args : ("?:\\Windows\\System32\\davclnt.dll,DavSetCookie", "?:\\Windows\\SysWOW64\\davclnt.dll,DavSetCookie") and 
+  
+  /* Access to named pipe via http */
+  process.args : ("http*/print/pipe/*", "http*/pipe/spoolss", "http*/pipe/srvsvc")
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1212"
+name = "Exploitation for Credential Access"
+reference = "https://attack.mitre.org/techniques/T1212/"
+
+
+[rule.threat.tactic]
+id = "TA0006"
+name = "Credential Access"
+reference = "https://attack.mitre.org/tactics/TA0006/"
+