execution_scripting_osascript_exec_followed_by_netcon.toml

[metadata]
creation_date = "2020/12/07"
maturity = "production"
updated_date = "2021/05/26"

[rule]
author = ["Elastic"]
description = """
Detects execution via the Apple script interpreter (osascript) followed by a network connection from the same process
within a short time period. Adversaries may use malicious scripts for execution and command and control.
"""
from = "now-9m"
index = ["auditbeat-*", "logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Apple Script Execution followed by Network Connection"
references = [
    "https://developer.apple.com/library/archive/documentation/LanguagesUtilities/Conceptual/MacAutomationScriptingGuide/index.html",
    "https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml"
]
risk_score = 47
rule_id = "47f76567-d58a-4fed-b32b-21f571e28910"
severity = "medium"
tags = ["Elastic", "Host", "macOS", "Threat Detection", "Command and Control", "Execution"]
type = "eql"

query = '''
sequence by host.id, process.entity_id with maxspan=30s
 [process where event.type == "start" and process.name == "osascript"]
 [network where event.type != "end" and process.name == "osascript" and destination.ip != "::1" and
  not 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")]
'''


[[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.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1105"
name = "Ingress Tool Transfer"
reference = "https://attack.mitre.org/techniques/T1105/"


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