[New Rule] Potential Lsass Memory Dump via MirrorDump (#1504)

* [New Rule] Potential Lsass Memory Dump via MirrorDump

* added tactic

* switched to kql

* added sysmon process access non ecs types

* Update rules/windows/credential_access_potential_lsa_memdump_via_mirrordump.toml

Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>

* Update rules/windows/credential_access_potential_lsa_memdump_via_mirrordump.toml

Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>

* rule.name as suggested by Justin and converted to EQL to add comments

* Update rules/windows/credential_access_potential_lsa_memdump_via_mirrordump.toml

Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>

* Update rules/windows/credential_access_potential_lsa_memdump_via_mirrordump.toml

Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>

Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>

(cherry picked from commit 521e4dc8f1)

etc/non-ecs-schema.json

@@ -8,7 +8,9 @@
     }
   },
   "winlogbeat-*": {
-    "winlog.event_data.OriginalFileName": "keyword"
+    "winlog.event_data.OriginalFileName": "keyword",
+    "winlog.event_data.GrantedAccess": "keyword",
+    "winlog.event_data.CallTrace": "keyword"
   },
   "filebeat-*": {
     "o365.audit.NewValue": "keyword"

rules/windows/credential_access_potential_lsa_memdump_via_mirrordump.toml

@@ -0,0 +1,52 @@
+[metadata]
+creation_date = "2021/09/27"
+maturity = "production"
+updated_date = "2021/09/27"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies suspicious access to an LSASS handle via DuplicateHandle from an unknown call trace module. 
+This may indicate an attempt to bypass the NtOpenProcess API to evade detection and dump Lsass memory
+for credential access.
+"""
+from = "now-9m"
+index = ["winlogbeat-*", "logs-windows.*"]
+language = "eql"
+license = "Elastic License v2"
+name = "Potential Credential Access via DuplicateHandle in LSASS"
+references = ["https://github.com/CCob/MirrorDump"]
+risk_score = 47
+rule_id = "02a4576a-7480-4284-9327-548a806b5e48"
+severity = "medium"
+tags = ["Elastic", "Host", "Windows", "Threat Detection", "Credential Access"]
+timestamp_override = "event.ingested"
+type = "eql"
+
+query = '''
+process where event.code == "10" and 
+
+ /* LSASS requesting DuplicateHandle access right to another process */
+ process.name : "lsass.exe" and winlog.event_data.GrantedAccess == "0x40" and
+
+ /* call is coming from an unknown executable region */
+ winlog.event_data.CallTrace : "*UNKNOWN*"
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1003"
+name = "OS Credential Dumping"
+reference = "https://attack.mitre.org/techniques/T1003/"
+
+  [[rule.threat.technique.subtechnique]]
+  name = "LSASS Memory"
+  id = "T1003.001"
+  reference = "https://attack.mitre.org/techniques/T1003/001/"
+
+[rule.threat.tactic]
+id = "TA0006"
+name = "Credential Access"
+reference = "https://attack.mitre.org/tactics/TA0006/"