Adrian Serrano
aa219710a1
In impact_hosts_file_modified rule, the `note` field contains a Windows path that causes a confused-face-emoji to be rendered in the Investigation Guide tab. Surrounding the path in backticks fixes it.
67 lines
2.2 KiB
TOML
67 lines
2.2 KiB
TOML
[metadata]
|
|
creation_date = "2020/07/07"
|
|
maturity = "production"
|
|
updated_date = "2021/10/27"
|
|
|
|
[rule]
|
|
author = ["Elastic"]
|
|
description = """
|
|
The hosts file on endpoints is used to control manual IP address to hostname resolutions. The hosts file is the first
|
|
point of lookup for DNS hostname resolution so if adversaries can modify the endpoint hosts file, they can route traffic
|
|
to malicious infrastructure. This rule detects modifications to the hosts file on Microsoft Windows, Linux (Ubuntu or
|
|
RHEL) and macOS systems.
|
|
"""
|
|
from = "now-9m"
|
|
index = ["auditbeat-*", "winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
|
|
language = "eql"
|
|
license = "Elastic License v2"
|
|
name = "Hosts File Modified"
|
|
note = """## Config
|
|
|
|
For Windows systems using Auditbeat, this rule requires adding `C:/Windows/System32/drivers/etc` as an additional path in the 'file_integrity' module of auditbeat.yml."""
|
|
references = ["https://www.elastic.co/guide/en/beats/auditbeat/current/auditbeat-reference-yml.html"]
|
|
risk_score = 47
|
|
rule_id = "9c260313-c811-4ec8-ab89-8f6530e0246c"
|
|
severity = "medium"
|
|
tags = ["Elastic", "Host", "Linux", "Windows", "macOS", "Threat Detection", "Impact"]
|
|
timestamp_override = "event.ingested"
|
|
type = "eql"
|
|
|
|
query = '''
|
|
any where
|
|
|
|
/* file events for creation; file change events are not captured by some of the included sources for linux and so may
|
|
miss this, which is the purpose of the process + command line args logic below */
|
|
(
|
|
event.category == "file" and event.type in ("change", "creation") and
|
|
file.path : ("/private/etc/hosts", "/etc/hosts", "?:\\Windows\\System32\\drivers\\etc\\hosts")
|
|
)
|
|
or
|
|
|
|
/* process events for change targeting linux only */
|
|
(
|
|
event.category == "process" and event.type in ("start") and
|
|
process.name in ("nano", "vim", "vi", "emacs", "echo", "sed") and
|
|
process.args : ("/etc/hosts")
|
|
)
|
|
'''
|
|
|
|
|
|
[[rule.threat]]
|
|
framework = "MITRE ATT&CK"
|
|
[[rule.threat.technique]]
|
|
id = "T1565"
|
|
reference = "https://attack.mitre.org/techniques/T1565/"
|
|
name = "Data Manipulation"
|
|
[[rule.threat.technique.subtechnique]]
|
|
id = "T1565.001"
|
|
reference = "https://attack.mitre.org/techniques/T1565/001/"
|
|
name = "Stored Data Manipulation"
|
|
|
|
|
|
|
|
[rule.threat.tactic]
|
|
id = "TA0040"
|
|
reference = "https://attack.mitre.org/tactics/TA0040/"
|
|
name = "Impact"
|