From 6883ea0aa6eafd08307ee4dc9caae91c9ac11170 Mon Sep 17 00:00:00 2001
From: Samirbous <64742097+Samirbous@users.noreply.github.com>
Date: Tue, 26 Jan 2021 08:35:16 +0100
Subject: [PATCH] [New Rule] Potential Persistence via Login Hook (#900)

* [New Rule] Potential Persistence via Login Hook

* Update persistence_loginwindow_plist_modification.toml

* Update rules/macos/persistence_loginwindow_plist_modification.toml

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

* Update rules/macos/persistence_loginwindow_plist_modification.toml

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

* Update rules/macos/persistence_loginwindow_plist_modification.toml

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

* Update rules/macos/persistence_loginwindow_plist_modification.toml

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

* Update persistence_loginwindow_plist_modification.toml

* Update rules/macos/persistence_loginwindow_plist_modification.toml

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

Co-authored-by: Andrew Pease <7442091+peasead@users.noreply.github.com>
Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>
---
 ...stence_loginwindow_plist_modification.toml | 47 +++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 rules/macos/persistence_loginwindow_plist_modification.toml

diff --git a/rules/macos/persistence_loginwindow_plist_modification.toml b/rules/macos/persistence_loginwindow_plist_modification.toml
new file mode 100644
index 000000000..477c43a57
--- /dev/null
+++ b/rules/macos/persistence_loginwindow_plist_modification.toml
@@ -0,0 +1,47 @@
+[metadata]
+creation_date = "2021/01/21"
+maturity = "production"
+updated_date = "2021/01/21"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies the creation or modification of the login window property list (plist). Adversaries may modify plist files to run a program during system boot or user login for persistence.
+"""
+from = "now-9m"
+index = ["auditbeat-*", "logs-endpoint.events.*"]
+language = "kuery"
+license = "Elastic License"
+name = "Potential Persistence via Login Hook"
+note = "Starting in Mac OS X 10.7 (Lion), users can specify certain applications to be re-opened when a user reboots their machine. This can be abused to establish or maintain persistence on a compromised system."
+references = ["https://github.com/D00MFist/PersistentJXA/blob/master/LoginScript.js"]
+risk_score = 47
+rule_id = "ac412404-57a5-476f-858f-4e8fbb4f48d8"
+severity = "medium"
+tags = ["Elastic", "Host", "macOS", "Threat Detection", "Persistence"]
+type = "query"
+
+query = '''
+event.category:"file" and not event.type:"deletion" and
+ file.name:"com.apple.loginwindow.plist" and
+ process.name:(* and not (systemmigrationd or DesktopServicesHelper or diskmanagementd or rsync or launchd or cfprefsd or xpcproxy or ManagedClient or MCXCompositor))
+'''
+
+
+[[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.technique.subtechnique]]
+id = "T1547.011"
+name = "Plist Modification"
+reference = "https://attack.mitre.org/techniques/T1547/011/"
+
+
+
+[rule.threat.tactic]
+id = "TA0003"
+name = "Persistence"
+reference = "https://attack.mitre.org/tactics/TA0003/"