From 51d50b7d8a7dc9276e76077ef3b8725d35545389 Mon Sep 17 00:00:00 2001
From: Samirbous <64742097+Samirbous@users.noreply.github.com>
Date: Mon, 3 Apr 2023 14:34:30 +0100
Subject: [PATCH] [New Rule] Lsass Process Access - Generic (#2613)

* Create credential_access_lsass_openprocess_api.toml

* Update credential_access_lsass_openprocess_api.toml

* Update credential_access_lsass_openprocess_api.toml

* Update non-ecs-schema.json

* Update rules/windows/credential_access_lsass_openprocess_api.toml

Co-authored-by: Justin Ibarra <16747370+brokensound77@users.noreply.github.com>

* Update rules/windows/credential_access_lsass_openprocess_api.toml

Co-authored-by: Terrance DeJesus <99630311+terrancedejesus@users.noreply.github.com>

* Update rules/windows/credential_access_lsass_openprocess_api.toml

Co-authored-by: Justin Ibarra <16747370+brokensound77@users.noreply.github.com>

* Update rules/windows/credential_access_lsass_openprocess_api.toml

Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>

* Update rules/windows/credential_access_lsass_openprocess_api.toml

Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>

* Update rules/windows/credential_access_lsass_openprocess_api.toml

Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>

* Update credential_access_lsass_openprocess_api.toml

* Update non-ecs-schema.json

---------

Co-authored-by: Mika Ayenson <Mikaayenson@users.noreply.github.com>
Co-authored-by: Justin Ibarra <16747370+brokensound77@users.noreply.github.com>
Co-authored-by: Terrance DeJesus <99630311+terrancedejesus@users.noreply.github.com>
Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>
Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>
---
 detection_rules/etc/non-ecs-schema.json       |  4 +-
 ...edential_access_lsass_openprocess_api.toml | 49 +++++++++++++++++++
 2 files changed, 52 insertions(+), 1 deletion(-)
 create mode 100644 rules/windows/credential_access_lsass_openprocess_api.toml

diff --git a/detection_rules/etc/non-ecs-schema.json b/detection_rules/etc/non-ecs-schema.json
index 4ed8867fd..e331f921d 100644
--- a/detection_rules/etc/non-ecs-schema.json
+++ b/detection_rules/etc/non-ecs-schema.json
@@ -73,7 +73,9 @@
     "dll.Ext.relative_file_creation_time": "double",
     "dll.Ext.relative_file_name_modify_time": "double",
     "process.Ext.relative_file_name_modify_time": "double",
-    "process.Ext.relative_file_creation_time": "double"
+    "process.Ext.relative_file_creation_time": "double",
+    "Target.process.name": "keyword",
+    "process.Ext.api.name": "keyword"
   },
   "logs-windows.*": {
     "powershell.file.script_block_text": "text"
diff --git a/rules/windows/credential_access_lsass_openprocess_api.toml b/rules/windows/credential_access_lsass_openprocess_api.toml
new file mode 100644
index 000000000..3a78a013d
--- /dev/null
+++ b/rules/windows/credential_access_lsass_openprocess_api.toml
@@ -0,0 +1,49 @@
+[metadata]
+creation_date = "2023/03/02"
+integration = ["endpoint"]
+maturity = "production"
+min_stack_comments = "New fields added: Lsass access events added in Elastic Endpoint 8.7."
+min_stack_version = "8.7.0"
+updated_date = "2023/03/02"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies access attempts to the LSASS handle, which may indicate an attempt to dump credentials from LSASS memory.
+"""
+from = "now-9m"
+index = ["logs-endpoint.events.*"]
+language = "eql"
+license = "Elastic License v2"
+name = "LSASS Process Access via Windows API"
+references = ["https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1003.001/T1003.001.md"]
+risk_score = 47
+rule_id = "ff4599cb-409f-4910-a239-52e4e6f532ff"
+severity = "medium"
+tags = ["Elastic", "Host", "Windows", "Threat Detection", "Credential Access"]
+timestamp_override = "event.ingested"
+type = "eql"
+
+query = '''
+api where host.os.type == "windows" and 
+ process.Ext.api.name in ("OpenProcess", "OpenThread") and Target.process.name : "lsass.exe"
+'''
+
+
+[[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]]
+id = "T1003.001"
+name = "LSASS Memory"
+reference = "https://attack.mitre.org/techniques/T1003/001/"
+
+
+
+[rule.threat.tactic]
+id = "TA0006"
+name = "Credential Access"
+reference = "https://attack.mitre.org/tactics/TA0006/"