defense_evasion_network_watcher_deletion.toml

[metadata]
creation_date = "2020/08/31"
integration = ["azure"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2022/12/14"

[rule]
author = ["Elastic"]
description = """
Identifies the deletion of a Network Watcher in Azure. Network Watchers are used to monitor, diagnose, view metrics, and
enable or disable logs for resources in an Azure virtual network. An adversary may delete a Network Watcher in an
attempt to evade defenses.
"""
false_positives = [
    """
    Network Watcher deletions may be done by a system or network administrator. Verify whether the username, hostname,
    and/or resource name should be making changes in your environment. Network Watcher deletions by unfamiliar users or
    hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
    """,
]
from = "now-25m"
index = ["filebeat-*", "logs-azure*"]
language = "kuery"
license = "Elastic License v2"
name = "Azure Network Watcher Deletion"
note = """## Setup

The Azure Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule."""
references = ["https://docs.microsoft.com/en-us/azure/network-watcher/network-watcher-monitoring-overview"]
risk_score = 47
rule_id = "323cb487-279d-4218-bcbd-a568efe930c6"
severity = "medium"
tags = ["Elastic", "Cloud", "Azure", "Continuous Monitoring", "SecOps", "Network Security"]
timestamp_override = "event.ingested"
type = "query"

query = '''
event.dataset:azure.activitylogs and azure.activitylogs.operation_name:"MICROSOFT.NETWORK/NETWORKWATCHERS/DELETE" and event.outcome:(Success or success)
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1562"
name = "Impair Defenses"
reference = "https://attack.mitre.org/techniques/T1562/"
[[rule.threat.technique.subtechnique]]
id = "T1562.001"
name = "Disable or Modify Tools"
reference = "https://attack.mitre.org/techniques/T1562/001/"



[rule.threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"