From ad514eaeabe2bec3ec95a64cea72d2ac2021bceb Mon Sep 17 00:00:00 2001
From: Samirbous <64742097+Samirbous@users.noreply.github.com>
Date: Fri, 29 Jan 2021 19:03:17 +0100
Subject: [PATCH] [New Rule] Attempt to Add an Account to the Admin Group
 (#803)

* [New Rule] Attempt to Add an Account to the Admin Group

* adjusted query for perf

* Update rules/macos/privilege_escalation_local_user_added_to_admin.toml

Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>

* Update rules/macos/privilege_escalation_local_user_added_to_admin.toml

Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>

* Update rules/macos/privilege_escalation_local_user_added_to_admin.toml

Co-authored-by: David French <56409778+threat-punter@users.noreply.github.com>

Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>
Co-authored-by: David French <56409778+threat-punter@users.noreply.github.com>
---
 ..._escalation_local_user_added_to_admin.toml | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 rules/macos/privilege_escalation_local_user_added_to_admin.toml

diff --git a/rules/macos/privilege_escalation_local_user_added_to_admin.toml b/rules/macos/privilege_escalation_local_user_added_to_admin.toml
new file mode 100644
index 000000000..f05951ebc
--- /dev/null
+++ b/rules/macos/privilege_escalation_local_user_added_to_admin.toml
@@ -0,0 +1,46 @@
+[metadata]
+creation_date = "2020/01/05"
+maturity = "production"
+updated_date = "2020/01/05"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies attempts to add an account to the admin group via the command line. This could be an indication of privilege
+escalation activity.
+"""
+from = "now-9m"
+index = ["auditbeat-*", "logs-endpoint.events.*"]
+language = "kuery"
+license = "Elastic License"
+name = "Potential Admin Group Account Addition"
+references = ["https://managingosx.wordpress.com/2010/01/14/add-a-user-to-the-admin-group-via-command-line-3-0/"]
+risk_score = 47
+rule_id = "565c2b44-7a21-4818-955f-8d4737967d2e"
+severity = "medium"
+tags = ["Elastic", "Host", "macOS", "Threat Detection", "Privilege Escalation"]
+type = "query"
+
+query = '''
+event.category:process and event.type:(start or process_started) and
+ process.name:(dscl or dseditgroup) and process.args:(("/Groups/admin" or admin) and ("-a" or "-append"))
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1078"
+name = "Valid Accounts"
+reference = "https://attack.mitre.org/techniques/T1078/"
+[[rule.threat.technique.subtechnique]]
+id = "T1078.003"
+name = "Local Accounts"
+reference = "https://attack.mitre.org/techniques/T1078/003/"
+
+
+
+[rule.threat.tactic]
+id = "TA0004"
+name = "Privilege Escalation"
+reference = "https://attack.mitre.org/tactics/TA0004/"