From 8878104f54b23acc3f67ad0397b09be59e765038 Mon Sep 17 00:00:00 2001
From: Samirbous <64742097+Samirbous@users.noreply.github.com>
Date: Wed, 3 Feb 2021 18:15:25 +0100
Subject: [PATCH] [New Rule] Potential Persistence via Periodic Tasks (#898)

* [New Rule] Potential Persistence via Periodic Tasks

* Update rules/macos/persistence_periodic_tasks_file_mdofiy.toml

Co-authored-by: Andrew Pease <7442091+peasead@users.noreply.github.com>

* Update rules/macos/persistence_periodic_tasks_file_mdofiy.toml

Co-authored-by: Andrew Pease <7442091+peasead@users.noreply.github.com>

* Update rules/macos/persistence_periodic_tasks_file_mdofiy.toml

Co-authored-by: Andrew Pease <7442091+peasead@users.noreply.github.com>

* Update rules/macos/persistence_periodic_tasks_file_mdofiy.toml

Co-authored-by: Andrew Pease <7442091+peasead@users.noreply.github.com>

* Update rules/macos/persistence_periodic_tasks_file_mdofiy.toml

Co-authored-by: Andrew Pease <7442091+peasead@users.noreply.github.com>

* Update rules/macos/persistence_periodic_tasks_file_mdofiy.toml

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

* Update rules/macos/persistence_periodic_tasks_file_mdofiy.toml

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

* relinted

Co-authored-by: Andrew Pease <7442091+peasead@users.noreply.github.com>
Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>
---
 ...ersistence_periodic_tasks_file_mdofiy.toml | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 rules/macos/persistence_periodic_tasks_file_mdofiy.toml

diff --git a/rules/macos/persistence_periodic_tasks_file_mdofiy.toml b/rules/macos/persistence_periodic_tasks_file_mdofiy.toml
new file mode 100644
index 000000000..a87e75515
--- /dev/null
+++ b/rules/macos/persistence_periodic_tasks_file_mdofiy.toml
@@ -0,0 +1,51 @@
+[metadata]
+creation_date = "2021/01/21"
+maturity = "production"
+updated_date = "2021/01/21"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies the creation or modification of the default configuration for periodic tasks. Adversaries may abuse periodic
+tasks to execute malicious code or maintain persistence.
+"""
+from = "now-9m"
+index = ["auditbeat-*", "logs-endpoint.events.*"]
+language = "kuery"
+license = "Elastic License"
+name = "Potential Persistence via Periodic Tasks"
+references = [
+    "https://opensource.apple.com/source/crontabs/crontabs-13/private/etc/defaults/periodic.conf.auto.html",
+    "https://www.oreilly.com/library/view/mac-os-x/0596003706/re328.html",
+    "https://github.com/D00MFist/PersistentJXA/blob/master/PeriodicPersist.js",
+]
+risk_score = 21
+rule_id = "48ec9452-e1fd-4513-a376-10a1a26d2c83"
+severity = "low"
+tags = ["Elastic", "Host", "macOS", "Threat Detection", "Persistence"]
+type = "query"
+
+query = '''
+event.category:"file" and not event.type:"deletion" and
+ file.path:(/private/etc/periodic/* or /private/etc/defaults/periodic.conf or /private/etc/periodic.conf)
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1053"
+name = "Scheduled Task/Job"
+reference = "https://attack.mitre.org/techniques/T1053/"
+[[rule.threat.technique.subtechnique]]
+id = "T1053.003"
+name = "Cron"
+reference = "https://attack.mitre.org/techniques/T1053/003/"
+
+
+
+[rule.threat.tactic]
+id = "TA0003"
+name = "Persistence"
+reference = "https://attack.mitre.org/tactics/TA0003/"
+