[metadata]
creation_date = "2023/08/22"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/08/22"

[rule]
author = ["Elastic"]
description = """
Identifies the install of browser extensions. Malicious browser extensions can be installed via app store downloads
masquerading as legitimate extensions, social engineering, or by an adversary that has already compromised a system.
"""
from = "now-119m"
interval = "60m"
index = ["logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Browser Extension Install"
risk_score = 21
rule_id = "f97504ac-1053-498f-aeaa-c6d01e76b379"
severity = "low"
tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Persistence", "Data Source: Elastic Defend", "Rule Type: BBR"]
timestamp_override = "event.ingested"
type = "eql"
building_block_type = "default"

query = '''
file where event.action : "creation" and 
(
  /* Firefox-Based Browsers */
  (
    file.name : "*.xpi" and
    file.path : "?:\\Users\\*\\AppData\\Roaming\\*\\Profiles\\*\\Extensions\\*.xpi"
  ) or
  /* Chromium-Based Browsers */
  (
    file.name : "*.crx" and
    file.path : "?:\\Users\\*\\AppData\\Local\\*\\*\\User Data\\Webstore Downloads\\*"
  )
)
'''

[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1176"
name = "Browser Extensions"
reference = "https://attack.mitre.org/techniques/T1176/"

[rule.threat.tactic]
id = "TA0003"
name = "Persistence"
reference = "https://attack.mitre.org/tactics/TA0003/"