[metadata]
creation_date = "2023/08/28"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/08/28"

[rule]
author = ["Elastic"]
description = """
This rule monitors a sequence involving a program compilation event followed by its execution and a subsequent network 
connection event. This behavior can indicate the set up of a reverse tcp connection to a command-and-control server. 
Attackers may spawn reverse shells to establish persistence onto a target system.
"""
from = "now-9m"
index = ["logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Network Connection via Recently Compiled Executable"
risk_score = 47
rule_id = "64cfca9e-0f6f-4048-8251-9ec56a055e9e"
severity = "medium"
tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Execution", "Data Source: Elastic Defend"]
type = "eql"
query = '''
sequence by host.id with maxspan=1m
  [process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and 
   process.name in ("gcc", "g++", "cc")] by process.args
  [file where host.os.type == "linux" and event.action == "creation" and process.name == "ld"] by file.name
  [process where host.os.type == "linux" and event.action == "exec" and event.type == "start"] by process.name
  [network where host.os.type == "linux" and event.action == "connection_attempted"] by process.name
'''

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

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

[[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]]
framework = "MITRE ATT&CK"

[rule.threat.tactic]
name = "Command and Control"
id = "TA0011"
reference = "https://attack.mitre.org/tactics/TA0011/"

[[rule.threat.technique]]
name = "Application Layer Protocol"
id = "T1071"
reference = "https://attack.mitre.org/techniques/T1071/"