From aa2dcd58e7831715e566e4af6b64570af4bcc125 Mon Sep 17 00:00:00 2001
From: Samirbous <64742097+Samirbous@users.noreply.github.com>
Date: Tue, 9 Feb 2021 10:59:35 +0100
Subject: [PATCH] [New Rule] Persistence via DirectoryService Plugin
 Modification (#858)

* [New Rule] Persistence via DirectoryService Plugin Modification

* Update persistence_directory_services_plugins_modification.toml

* adjusted description

* Update rules/macos/persistence_directory_services_plugins_modification.toml

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

* Update rules/macos/persistence_directory_services_plugins_modification.toml

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

* Update rules/macos/persistence_directory_services_plugins_modification.toml

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

* relinted

Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>
Co-authored-by: David French <56409778+threat-punter@users.noreply.github.com>
---
 ...rectory_services_plugins_modification.toml | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 rules/macos/persistence_directory_services_plugins_modification.toml

diff --git a/rules/macos/persistence_directory_services_plugins_modification.toml b/rules/macos/persistence_directory_services_plugins_modification.toml
new file mode 100644
index 000000000..cbccc410b
--- /dev/null
+++ b/rules/macos/persistence_directory_services_plugins_modification.toml
@@ -0,0 +1,44 @@
+[metadata]
+creation_date = "2021/01/13"
+maturity = "production"
+updated_date = "2021/01/13"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies the creation or modification of a DirectoryService PlugIns (dsplug) file. The DirectoryService daemonlaunches
+on each system boot and automatically reloads after crash. It scans and executes bundles that are located in the
+DirectoryServices PlugIns folder and can be abused by adversaries to maintain persistence.
+"""
+false_positives = ["Trusted DirectoryService PlugIns"]
+from = "now-9m"
+index = ["auditbeat-*", "logs-endpoint.events.*"]
+language = "kuery"
+license = "Elastic License"
+name = "Persistence via DirectoryService Plugin Modification"
+references = ["https://blog.chichou.me/2019/11/21/two-macos-persistence-tricks-abusing-plugins/"]
+risk_score = 47
+rule_id = "89fa6cb7-6b53-4de2-b604-648488841ab8"
+severity = "medium"
+tags = ["Elastic", "Host", "macOS", "Threat Detection", "Persistence"]
+type = "query"
+
+query = '''
+event.category:file and not event.type:deletion and
+  file.path:/Library/DirectoryServices/PlugIns/*.dsplug
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1547"
+name = "Boot or Logon Autostart Execution"
+reference = "https://attack.mitre.org/techniques/T1547/"
+
+
+[rule.threat.tactic]
+id = "TA0003"
+name = "Persistence"
+reference = "https://attack.mitre.org/tactics/TA0003/"
+