[metadata]
creation_date = "2024/07/10"
integration = ["endpoint"]
maturity = "production"
updated_date = "2024/07/10"

[rule]
author = ["Elastic"]
description = """
This rule identifies a sequence of events where a process named `entrypoint.sh` is started in a container, followed by a
network connection attempt. This sequence indicates a potential egress connection from an entrypoint in a container. An
entrypoint is a command or script specified in the Dockerfile and executed when the container starts. Attackers can use
this technique to establish a foothold in the environment, escape from a container to the host, or establish persistence.
"""
from = "now-9m"
index = ["logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Egress Connection from Entrypoint in Container"
risk_score = 47
rule_id = "c75d0c86-38d6-4821-98a1-465cff8ff4c8"
severity = "medium"
tags = [
    "Domain: Endpoint",
    "Domain: Container",
    "OS: Linux",
    "Use Case: Threat Detection",
    "Tactic: Execution",
    "Data Source: Elastic Defend",
]
timestamp_override = "event.ingested"
type = "eql"
query = '''
sequence by host.id with maxspan=3s
  [process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and
   process.entry_leader.entry_meta.type == "container" and process.name == "entrypoint.sh"] by process.entity_id
  [network where event.type == "start" and event.action == "connection_attempted" and not (
     destination.ip == null or destination.ip == "0.0.0.0" or cidrmatch(
       destination.ip, "10.0.0.0/8", "127.0.0.0/8", "169.254.0.0/16", "172.16.0.0/12", "192.0.0.0/24", "192.0.0.0/29",
       "192.0.0.8/32", "192.0.0.9/32", "192.0.0.10/32", "192.0.0.170/32", "192.0.0.171/32", "192.0.2.0/24",
       "192.31.196.0/24", "192.52.193.0/24", "192.168.0.0/16", "192.88.99.0/24", "224.0.0.0/4", "100.64.0.0/10",
       "192.175.48.0/24","198.18.0.0/15", "198.51.100.0/24", "203.0.113.0/24", "240.0.0.0/4", "::1", "FE80::/10",
       "FF00::/8", "172.31.0.0/16"
       )
    )] by process.parent.entity_id
'''

[[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/"

[[rule.threat]]
framework = "MITRE ATT&CK"

[[rule.threat.technique]]
id = "T1611"
name = "Escape to Host"
reference = "https://attack.mitre.org/techniques/T1611/"

[rule.threat.tactic]
id = "TA0004"
name = "Privilege Escalation"
reference = "https://attack.mitre.org/tactics/TA0004/"