Suspicious CronTab Creation or Modification

 1[metadata]
 2creation_date = "2022/04/25"
 3integration = ["endpoint"]
 4maturity = "production"
 5updated_date = "2024/05/21"
 6
 7[rule]
 8author = ["Elastic"]
 9description = """
10Identifies attempts to create or modify a crontab via a process that is not crontab (i.e python, osascript, etc.). This
11activity should not be highly prevalent and could indicate the use of cron as a persistence mechanism by a threat actor.
12"""
13from = "now-9m"
14index = ["logs-endpoint.events.*"]
15language = "eql"
16license = "Elastic License v2"
17name = "Suspicious CronTab Creation or Modification"
18references = [
19    "https://taomm.org/PDFs/vol1/CH%200x02%20Persistence.pdf",
20    "https://theevilbit.github.io/beyond/beyond_0004/",
21]
22risk_score = 47
23rule_id = "530178da-92ea-43ce-94c2-8877a826783d"
24setup = """## Setup
25
26This rule requires data coming in from Elastic Defend.
27
28### Elastic Defend Integration Setup
29Elastic Defend is integrated into the Elastic Agent using Fleet. Upon configuration, the integration allows the Elastic Agent to monitor events on your host and send data to the Elastic Security app.
30
31#### Prerequisite Requirements:
32- Fleet is required for Elastic Defend.
33- To configure Fleet Server refer to the [documentation](https://www.elastic.co/guide/en/fleet/current/fleet-server.html).
34
35#### The following steps should be executed in order to add the Elastic Defend integration on a macOS System:
36- Go to the Kibana home page and click "Add integrations".
37- In the query bar, search for "Elastic Defend" and select the integration to see more details about it.
38- Click "Add Elastic Defend".
39- Configure the integration name and optionally add a description.
40- Select the type of environment you want to protect, for MacOS it is recommended to select "Traditional Endpoints".
41- Select a configuration preset. Each preset comes with different default settings for Elastic Agent, you can further customize these later by configuring the Elastic Defend integration policy. [Helper guide](https://www.elastic.co/guide/en/security/current/configure-endpoint-integration-policy.html).
42- We suggest selecting "Complete EDR (Endpoint Detection and Response)" as a configuration setting, that provides "All events; all preventions"
43- Enter a name for the agent policy in "New agent policy name". If other agent policies already exist, you can click the "Existing hosts" tab and select an existing policy instead.
44For more details on Elastic Agent configuration settings, refer to the [helper guide](https://www.elastic.co/guide/en/fleet/current/agent-policy.html).
45- Click "Save and Continue".
46- To complete the integration, select "Add Elastic Agent to your hosts" and continue to the next section to install the Elastic Agent on your hosts.
47For more details on Elastic Defend refer to the [helper guide](https://www.elastic.co/guide/en/security/current/install-endpoint.html).
48"""
49severity = "medium"
50tags = [
51    "Domain: Endpoint",
52    "OS: macOS",
53    "Use Case: Threat Detection",
54    "Tactic: Persistence",
55    "Data Source: Elastic Defend",
56]
57timestamp_override = "event.ingested"
58type = "eql"
59
60query = '''
61file where host.os.type == "macos" and event.type != "deletion" and process.name != null and
62  file.path : "/private/var/at/tabs/*" and not process.executable == "/usr/bin/crontab"
63'''
64
65
66[[rule.threat]]
67framework = "MITRE ATT&CK"
68[[rule.threat.technique]]
69id = "T1053"
70name = "Scheduled Task/Job"
71reference = "https://attack.mitre.org/techniques/T1053/"
72[[rule.threat.technique.subtechnique]]
73id = "T1053.003"
74name = "Cron"
75reference = "https://attack.mitre.org/techniques/T1053/003/"
76
77
78
79[rule.threat.tactic]
80id = "TA0003"
81name = "Persistence"
82reference = "https://attack.mitre.org/tactics/TA0003/"