Unusual Linux Network Connection Discovery

 1[metadata]
 2creation_date = "2020/09/03"
 3integration = ["auditd_manager", "endpoint"]
 4maturity = "production"
 5updated_date = "2023/07/27"
 6min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 7min_stack_version = "8.3.0"
 8
 9[rule]
10anomaly_threshold = 25
11author = ["Elastic"]
12description = """
13Looks for commands related to system network connection discovery from an unusual user context. This can be due to
14uncommon troubleshooting activity or due to a compromised account. A compromised account may be used by a threat actor
15to engage in system network connection discovery in order to increase their understanding of connected services and
16systems. This information may be used to shape follow-up behaviors such as lateral movement or additional discovery.
17"""
18false_positives = [
19    """
20    Uncommon user command activity can be due to an engineer logging onto a server instance in order to perform manual
21    troubleshooting or reconfiguration.
22    """,
23]
24from = "now-45m"
25interval = "15m"
26license = "Elastic License v2"
27machine_learning_job_id = ["v3_linux_network_connection_discovery"]
28name = "Unusual Linux Network Connection Discovery"
29risk_score = 21
30rule_id = "c28c4d8c-f014-40ef-88b6-79a1d67cd499"
31severity = "low"
32tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Rule Type: ML", "Rule Type: Machine Learning", "Tactic: Discovery"]
33type = "machine_learning"
34[[rule.threat]]
35framework = "MITRE ATT&CK"
36[[rule.threat.technique]]
37id = "T1049"
38name = "System Network Connections Discovery"
39reference = "https://attack.mitre.org/techniques/T1049/"
40
41
42[rule.threat.tactic]
43id = "TA0007"
44name = "Discovery"
45reference = "https://attack.mitre.org/tactics/TA0007/"