[metadata]
creation_date = "2022/02/24"
maturity = "production"
updated_date = "2022/03/28"

[rule]
author = ["Elastic"]
description = """
Identifies Linux binary apt/apt-get abuse to breakout out of restricted shells or environments by spawning an
interactive system shell. The apt utility allows us to manage installation and removal of softwares on Debian based
Linux distributions and the activity of spawning shell is not a standard use of this binary for a user or system
administrator. It indicates a potentially malicious actor attempting to improve the capabilities or stability of their
access.
"""
from = "now-9m"
index = ["logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Linux Restricted Shell Breakout via  apt/apt-get Changelog Escape"
references = ["https://gtfobins.github.io/gtfobins/apt/", "https://gtfobins.github.io/gtfobins/apt-get/"]
risk_score = 47
rule_id = "8fed8450-847e-43bd-874c-3bbf0cd425f3"
severity = "medium"
tags = ["Elastic", "Host", "Linux", "Threat Detection", "Execution", "GTFOBins"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
sequence by host.id, process.pid with maxspan=1m 
  [process where process.name : ("apt", "apt-get") and process.args : "changelog"] 
  [process where process.name : "sensible-pager" and process.args : ("/bin/sh", "/bin/bash") and 
   process.parent.name : ("apt", "apt-get")]
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1059"
name = "Command and Scripting Interpreter"
reference = "https://attack.mitre.org/techniques/T1059/"
[[rule.threat.technique.subtechnique]]
id = "T1059.004"
name = "Unix Shell"
reference = "https://attack.mitre.org/techniques/T1059/004/"



[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"