title: T1021 DCOM InternetExplorer.Application Iertutil DLL Hijack
author: Roberto Rodriguez @Cyb3rWard0g, Open Threat Research (OTR)
date: 2020/10/12
description: Detects a threat actor creating a file named `iertutil.dll` in the `C:\Program
  Files\Internet Explorer\` directory over the network for a DCOM InternetExplorer
  DLL Hijack scenario.
detection:
  SELECTION_1:
    EventID: 5145
  SELECTION_2:
    RelativeTargetName: '*\Internet Explorer\iertutil.dll'
  SELECTION_3:
    SubjectUserName: '*$'
  condition: ((SELECTION_1 and SELECTION_2) and  not (SELECTION_3))
falsepositives:
- Unknown
id: c39f0c81-7348-4965-ab27-2fde35a1b641
level: critical
logsource:
  product: windows
  service: security
references:
- https://threathunterplaybook.com/notebooks/windows/08_lateral_movement/WIN-201009183000.html
status: experimental
tags:
- attack.lateral_movement
- attack.t1021.002
- attack.t1021.003
ruletype: SIGMA