defense_evasion_log_files_deleted.toml

[metadata]
creation_date = "2020/11/03"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/02/22"

[rule]
author = ["Elastic"]
description = """
Identifies the deletion of sensitive Linux system logs. This may indicate an attempt to evade detection or destroy
forensic evidence on a system.
"""
from = "now-9m"
index = ["auditbeat-*", "logs-endpoint.events.*", "endgame-*"]
language = "eql"
license = "Elastic License v2"
name = "System Log File Deletion"
note = """## Setup

If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.
"""
references = [
    "https://www.fireeye.com/blog/threat-research/2020/11/live-off-the-land-an-overview-of-unc1945.html",
]
risk_score = 47
rule_id = "aa895aea-b69c-4411-b110-8d7599634b30"
severity = "medium"
tags = ["Elastic", "Host", "Linux", "Threat Detection", "Defense Evasion", "Elastic Endgame"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
file where host.os.type == "linux" and event.type == "deletion" and
  file.path :
    (
    "/var/run/utmp",
    "/var/log/wtmp",
    "/var/log/btmp",
    "/var/log/lastlog",
    "/var/log/faillog",
    "/var/log/syslog",
    "/var/log/messages",
    "/var/log/secure",
    "/var/log/auth.log",
    "/var/log/boot.log",
    "/var/log/kern.log"
    ) and
    not process.name : ("gzip")
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1070"
name = "Indicator Removal"
reference = "https://attack.mitre.org/techniques/T1070/"
[[rule.threat.technique.subtechnique]]
id = "T1070.002"
name = "Clear Linux or Mac System Logs"
reference = "https://attack.mitre.org/techniques/T1070/002/"



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