[metadata]
creation_date = "2020/09/02"
maturity = "production"
updated_date = "2021/03/03"

[rule]
author = ["Elastic"]
description = """
Identifies a suspicious file that was written by a PDF reader application and subsequently executed. These processes are
often launched via exploitation of PDF applications.
"""
from = "now-9m"
index = ["logs-endpoint.events.*", "winlogbeat-*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "Execution of File Written or Modified by PDF Reader"
risk_score = 21
rule_id = "1defdd62-cd8d-426e-a246-81a37751bb2b"
severity = "high"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Execution"]
type = "eql"

query = '''
sequence with maxspan=2h
  [file where event.type != "deletion" and file.extension : "exe" and
     (process.name : "AcroRd32.exe" or
      process.name : "rdrcef.exe" or
      process.name : "FoxitPhantomPDF.exe" or
      process.name : "FoxitReader.exe") and
     not (file.name : "FoxitPhantomPDF.exe" or
          file.name : "FoxitPhantomPDFUpdater.exe" or
          file.name : "FoxitReader.exe" or
          file.name : "FoxitReaderUpdater.exe" or
          file.name : "AcroRd32.exe" or
          file.name : "rdrcef.exe")
  ] by host.id, file.path
  [process where event.type in ("start", "process_started")] by host.id, process.executable
'''


[[rule.threat]]
framework = "MITRE ATT&CK"

[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[[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.technique.subtechnique]]
id = "T1566.002"
name = "Spearphishing Link"
reference = "https://attack.mitre.org/techniques/T1566/002/"



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