initial_access_suspicious_mac_ms_office_child_process.toml

[metadata]
creation_date = "2021/01/04"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2022/12/14"

[rule]
author = ["Elastic"]
description = """
Identifies suspicious child processes of frequently targeted Microsoft Office applications (Word, PowerPoint, and
Excel). These child processes are often launched during exploitation of Office applications or by documents with
malicious macros.
"""
from = "now-9m"
index = ["logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Suspicious macOS MS Office Child Process"
references = ["https://blog.malwarebytes.com/cybercrime/2017/02/microsoft-office-macro-malware-targets-macs/"]
risk_score = 47
rule_id = "66da12b1-ac83-40eb-814c-07ed1d82b7b9"
severity = "medium"
tags = ["Elastic", "Host", "macOS", "Threat Detection", "Initial Access"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
process where event.type in ("start", "process_started") and
 process.parent.name:("Microsoft Word", "Microsoft PowerPoint", "Microsoft Excel") and
 process.name:
 (
   "bash",
   "dash",
   "sh",
   "tcsh",
   "csh",
   "zsh",
   "ksh",
   "fish",
   "python*",
   "perl*",
   "php*",
   "osascript",
   "pwsh",
   "curl",
   "wget",
   "cp",
   "mv",
   "base64",
   "launchctl"
  ) and
  /* noisy false positives related to product version discovery and office errors reporting */
  not process.args:
    (
      "ProductVersion",
      "hw.model",
      "ioreg",
      "ProductName",
      "ProductUserVisibleVersion",
      "ProductBuildVersion",
      "/Library/Application Support/Microsoft/MERP*/Microsoft Error Reporting.app/Contents/MacOS/Microsoft Error Reporting"
    )
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1566"
name = "Phishing"
reference = "https://attack.mitre.org/techniques/T1566/"
[[rule.threat.technique.subtechnique]]
id = "T1566.001"
name = "Spearphishing Attachment"
reference = "https://attack.mitre.org/techniques/T1566/001/"



[rule.threat.tactic]
id = "TA0001"
name = "Initial Access"
reference = "https://attack.mitre.org/tactics/TA0001/"