Hidden Executable Initiated Egress Network Connection

[rule]
description = """
This rule detects when a hidden process executes a command that includes an IP address as an argument and initiates an
egress network connection. This may indicate command and control behavior.
"""
id = "c14705f7-ebd3-4cf7-88b3-6bff2d832f1b"
license = "Elastic License v2"
name = "Hidden Executable Initiated Egress Network Connection"
os_list = ["linux"]
version = "1.0.7"

query = '''
sequence by process.entity_id with maxspan=10s
  [process where event.type == "start" and event.action == "exec" and process.name like ".*" and
   process.command_line regex ".*[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}.*" and
   not (
     process.executable like (
       "/home/*/.npm/_npx/*/node_modules/opencode-ai/bin/.opencode",
       "/home/*/.local/share/fnm/node-versions/*/installation/lib/node_modules/opencode-ai/bin/.opencode"
     ) or
     process.parent.executable == "/usr/bin/buildah"
  )]
  [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"
     )
   )
  ]
'''

min_endpoint_version = "7.15.0"
optional_actions = []
[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 0

[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 1

[[actions]]
action = "kill_process"
field = "process.parent.entity_id"
state = 0

[[actions]]
action = "kill_process"
field = "process.parent.entity_id"
state = 1

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1564"
name = "Hide Artifacts"
reference = "https://attack.mitre.org/techniques/T1564/"


[threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"
[[threat]]
framework = "MITRE ATT&CK"

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

[internal]
min_endpoint_version = "7.15.0"