[metadata]
creation_date = "2021/02/23"
maturity = "production"
updated_date = "2021/08/03"

[rule]
author = ["Elastic"]
description = """
Identifies when the built in macOS Installer program generates a network event after attempting to install a .pkg file.
This activity has been observed being leveraged by malware.
"""
false_positives = [
    """
    Custom organization-specific macOS packages that use .pkg files to run cURL could trigger this rule. If known
    behavior is causing false positives, it can be excluded from the rule.
    """,
]
from = "now-9m"
index = ["logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "macOS Installer Spawns Network Event"
references = [
    "https://redcanary.com/blog/clipping-silver-sparrows-wings",
    "https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml",
]
risk_score = 47
rule_id = "99239e7d-b0d4-46e3-8609-acafcf99f68c"
severity = "medium"
tags = ["Elastic", "Host", "macOS", "Threat Detection", "Execution"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
sequence by process.entity_id with maxspan=1m
  [process where event.type == "start" and host.os.family == "macos" and
    process.parent.executable in ("/usr/sbin/installer", "/System/Library/CoreServices/Installer.app/Contents/MacOS/Installer") ]
  [network where 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.technique.subtechnique]]
id = "T1059.007"
name = "JavaScript"
reference = "https://attack.mitre.org/techniques/T1059/007/"



[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1071"
name = "Application Layer Protocol"
reference = "https://attack.mitre.org/techniques/T1071/"
[[rule.threat.technique.subtechnique]]
id = "T1071.001"
name = "Web Protocols"
reference = "https://attack.mitre.org/techniques/T1071/001/"



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