From acff6a3a5de66e345096ded690562f3e77dd4b7e Mon Sep 17 00:00:00 2001
From: Samirbous <64742097+Samirbous@users.noreply.github.com>
Date: Fri, 29 Jan 2021 09:16:27 +0100
Subject: [PATCH] [New Rule] 2 Rules for Persistence via Emond (#832)

* [New Rule] 2 Rules for Persistence via Emond

* removed auditbeat index

process.parent.name not captured

* Update persistence_emond_rules_process_execution.toml

* Update rules/macos/persistence_emond_rules_file_creation.toml

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

* Update rules/macos/persistence_emond_rules_process_execution.toml

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

* Update rules/macos/persistence_emond_rules_file_creation.toml

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

* Update rules/macos/persistence_emond_rules_process_execution.toml

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

* relint

* 2021

* Update persistence_emond_rules_process_execution.toml

Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>
---
 ...persistence_emond_rules_file_creation.toml | 47 ++++++++++++
 ...istence_emond_rules_process_execution.toml | 71 +++++++++++++++++++
 2 files changed, 118 insertions(+)
 create mode 100644 rules/macos/persistence_emond_rules_file_creation.toml
 create mode 100644 rules/macos/persistence_emond_rules_process_execution.toml

diff --git a/rules/macos/persistence_emond_rules_file_creation.toml b/rules/macos/persistence_emond_rules_file_creation.toml
new file mode 100644
index 000000000..216ef5c03
--- /dev/null
+++ b/rules/macos/persistence_emond_rules_file_creation.toml
@@ -0,0 +1,47 @@
+[metadata]
+creation_date = "2021/01/11"
+maturity = "production"
+updated_date = "2021/01/11"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies the creation or modification of the Event Monitor Daemon (emond) rules. Adversaries may abuse this service by
+writing a rule to execute commands when a defined event occurs, such as system start up or user authentication.
+"""
+from = "now-9m"
+index = ["auditbeat-*", "logs-endpoint.events.*"]
+language = "eql"
+license = "Elastic License"
+name = "Emond Rules Creation or Modification"
+references = ["https://www.xorrior.com/emond-persistence/"]
+risk_score = 47
+rule_id = "a6bf4dd4-743e-4da8-8c03-3ebd753a6c90"
+severity = "medium"
+tags = ["Elastic", "Host", "macOS", "Threat Detection", "Persistence"]
+type = "eql"
+
+query = '''
+file where event.type != "deletion" and
+ file.path : ("/private/etc/emond.d/rules/*.plist", "/etc/emon.d/rules/*.plist")
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1546"
+name = "Event Triggered Execution"
+reference = "https://attack.mitre.org/techniques/T1546/"
+[[rule.threat.technique.subtechnique]]
+id = "T1546.014"
+name = "Emond"
+reference = "https://attack.mitre.org/techniques/T1546/014/"
+
+
+
+[rule.threat.tactic]
+id = "TA0003"
+name = "Persistence"
+reference = "https://attack.mitre.org/tactics/TA0003/"
+
diff --git a/rules/macos/persistence_emond_rules_process_execution.toml b/rules/macos/persistence_emond_rules_process_execution.toml
new file mode 100644
index 000000000..bb0da753c
--- /dev/null
+++ b/rules/macos/persistence_emond_rules_process_execution.toml
@@ -0,0 +1,71 @@
+[metadata]
+creation_date = "2021/01/11"
+maturity = "production"
+updated_date = "2021/01/11"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies the execution of a suspicious child process of the Event Monitor Daemon (emond). Adversaries may abuse this
+service by writing a rule to execute commands when a defined event occurs, such as system start up or user
+authentication.
+"""
+from = "now-9m"
+index = ["logs-endpoint.events.*"]
+language = "eql"
+license = "Elastic License"
+name = "Suspicious Emond Child Process"
+references = ["https://www.xorrior.com/emond-persistence/"]
+risk_score = 47
+rule_id = "3e3d15c6-1509-479a-b125-21718372157e"
+severity = "medium"
+tags = ["Elastic", "Host", "macOS", "Threat Detection", "Execution", "Persistence"]
+type = "eql"
+
+query = '''
+process where event.type in ("start", "process_started") and
+ process.parent.name : "emond" and
+ process.name : (
+   "bash",
+   "dash",
+   "sh",
+   "tcsh",
+   "csh",
+   "zsh",
+   "ksh",
+   "fish",
+   "Python",
+   "python*",
+   "perl*",
+   "php*",
+   "osascript",
+   "pwsh",
+   "curl",
+   "wget",
+   "cp",
+   "mv",
+   "touch",
+   "echo",
+   "base64",
+   "launchctl")
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1546"
+name = "Event Triggered Execution"
+reference = "https://attack.mitre.org/techniques/T1546/"
+[[rule.threat.technique.subtechnique]]
+id = "T1546.014"
+name = "Emond"
+reference = "https://attack.mitre.org/techniques/T1546/014/"
+
+
+
+[rule.threat.tactic]
+id = "TA0003"
+name = "Persistence"
+reference = "https://attack.mitre.org/tactics/TA0003/"
+