[metadata]
creation_date = "2020/11/03"
maturity = "production"
updated_date = "2020/11/03"

[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.*"]
language = "eql"
license = "Elastic License"
name = "System Log File Deletion"
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"]
type = "eql"

query = '''
file where 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"
    )
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1070"
name = "Indicator Removal on Host"
reference = "https://attack.mitre.org/techniques/T1070/"


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