DCOM InternetExplorer.Application Iertutil DLL Hijack - Security — Sigma Rule

Rule metadata and linked tags

Author: Roberto Rodriguez @Cyb3rWard0g, Open Threat Research (OTR). Source status: test; severity: high. Source dates: 2020-10-12 / 2022-11-26.

{
  "product": "windows",
  "service": "security"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 24e23ab7d09298a600fb73b1c3b96afcc0c76fdd964a6ab6cfb27970eec7743b

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: DCOM InternetExplorer.Application Iertutil DLL Hijack - Security
id: c39f0c81-7348-4965-ab27-2fde35a1b641
status: test
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.
references:
    - https://threathunterplaybook.com/hunts/windows/201009-RemoteDCOMIErtUtilDLLHijack/notebook.html
author: Roberto Rodriguez @Cyb3rWard0g, Open Threat Research (OTR)
date: 2020-10-12
modified: 2022-11-26
tags:
    - attack.lateral-movement
    - attack.t1021.002
    - attack.t1021.003
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 5145
        RelativeTargetName|endswith: '\Internet Explorer\iertutil.dll'
    filter:
        SubjectUserName|endswith: '$'
    condition: selection and not filter
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://threathunterplaybook.com/hunts/windows/201009-RemoteDCOMIErtUtilDLLHijack/notebook.html