[metadata]
creation_date = "2023/03/21"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup, New Term"
min_stack_version = "8.6.0"
updated_date = "2023/04/03"

[rule]
author = ["Elastic"]
description = """
Files that are placed in the /etc/init.d/ directory in Unix can be used to start custom applications,
services, scripts or commands during start-up. Init.d has been mostly replaced in favor of Systemd, however, 
through the "systemd-sysv-generator" init.d files can be converted to service unit files that run at boot.
Adversaries may add or alter files located in the /etc/init.d/ directory to execute malicious code on boot
time in order to gain persistence onto the system. 
"""
from = "now-9m"
index = ["logs-endpoint.events.*", "endgame-*"]
language = "kuery"
license = "Elastic License v2"
name = "Potential Persistence Through init.d Detected"
references = [
    "https://www.intezer.com/blog/malware-analysis/hiddenwasp-malware-targeting-linux-systems/",
    "https://pberba.github.io/security/2022/02/06/linux-threat-hunting-for-persistence-initialization-scripts-and-shell-configuration/#8-boot-or-logon-initialization-scripts-rc-scripts",
    "https://www.cyberciti.biz/faq/how-to-enable-rc-local-shell-script-on-systemd-while-booting-linux-system/"

]
risk_score = 47
rule_id = "474fd20e-14cc-49c5-8160-d9ab4ba16c8b"
severity = "medium"
tags = ["Elastic", "Host", "Linux", "Threat Detection", "Persistence", "Elastic Endgame"]
timestamp_override = "event.ingested"
type = "new_terms"

query = '''
host.os.type :"linux" and event.action:("creation" or "file_create_event" or "rename" or "file_rename_event") and 
file.path : /etc/init.d/* and not process.executable : ("/usr/bin/dpkg" or "/usr/bin/dockerd" or "/bin/rpm") and not 
file.extension : "swp"
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1037"
name = "Boot or Logon Initialization Scripts"
reference = "https://attack.mitre.org/techniques/T1037/"



[rule.threat.tactic]
id = "TA0003"
name = "Persistence"
reference = "https://attack.mitre.org/tactics/TA0003/"


[rule.new_terms]
field = "new_terms_fields"
value = ["file.path", "process.name"]
[[rule.new_terms.history_window_start]]
field = "history_window_start"
value = "now-7d"