SigmaHQ/rules/windows/process_creation/win_exploit_cve_2017_0261.yml

title: Exploit for CVE-2017-0261
id: 864403a1-36c9-40a2-a982-4c9a45f7d833
status: experimental
description: Detects Winword starting uncommon sub process FLTLDR.exe as used in exploits for CVE-2017-0261 and CVE-2017-0262
references:
    - https://www.fireeye.com/blog/threat-research/2017/05/eps-processing-zero-days.html
author: Florian Roth
date: 2018/02/22
modified: 2020/08/29
tags:
  - attack.execution
  - attack.t1203
  - attack.t1204.002
  - attack.t1204  # an old one
  - attack.initial_access
  - attack.t1566.001
  - attack.t1193  # an old one
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\WINWORD.EXE'
        Image|endswith: '\FLTLDR.exe*'
    condition: selection
falsepositives:
    - Several false positives identified, check for suspicious file names or locations (e.g. Temp folders)
level: medium