[metadata]
creation_date = "2020/09/02"
ecs_version = ["1.6.0"]
maturity = "production"
updated_date = "2020/09/02"

[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-*"]
language = "eql"
license = "Elastic License"
name = "Execution of File Written or Modified by PDF Reader"
risk_score = 21
rule_id = "1defdd62-cd8d-426e-a246-81a37751bb2b"
severity = "high"
tags = ["Elastic", "Windows"]
type = "eql"

query = '''
sequence with maxspan=2h
  [file where event.type != "delete" and file.extension == "exe" and
     process.name in ("acrord32.exe", "rdrcef.exe", "foxitphantomPDF.exe", "foxitreader.exe") and
     file.name not in ("foxitphantomPDF.exe",
                       "FoxitPhantomPDFUpdater.exe",
                       "foxitreader.exe",
                       "FoxitReaderUpdater.exe",
                       "acrord32.exe",
                       "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.technique]]
id = "T1064"
name = "Scripting"
reference = "https://attack.mitre.org/techniques/T1064/"

[[rule.threat.technique]]
id = "T1192"
name = "Spearphishing Link"
reference = "https://attack.mitre.org/techniques/T1192/"

[[rule.threat.technique]]
id = "T1193"
name = "Spearphishing Attachment"
reference = "https://attack.mitre.org/techniques/T1193/"


[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"