DHCP Callout DLL Installation — Sigma Rule

Rule metadata and linked tags

Author: Dimitrios Slamaris. Source status: test; severity: high. Source dates: 2017-05-15 / 2023-08-17.

{
  "category": "registry_set",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 11f369f964efd9c5d2128ea12e27625d11d63b3fb115debe4c2cfe41888aca8a

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: DHCP Callout DLL Installation
id: 9d3436ef-9476-4c43-acca-90ce06bdf33a
status: test
description: Detects the installation of a Callout DLL via CalloutDlls and CalloutEnabled parameter in Registry, which can be used to execute code in context of the DHCP server (restart required)
references:
    - https://blog.3or.de/mimilib-dhcp-server-callout-dll-injection.html
    - https://technet.microsoft.com/en-us/library/cc726884(v=ws.10).aspx
    - https://msdn.microsoft.com/de-de/library/windows/desktop/aa363389(v=vs.85).aspx
author: Dimitrios Slamaris
date: 2017-05-15
modified: 2023-08-17
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.execution
    - attack.stealth
    - attack.defense-impairment
    - attack.t1574.001
    - attack.t1112
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|endswith:
            - '\Services\DHCPServer\Parameters\CalloutDlls'
            - '\Services\DHCPServer\Parameters\CalloutEnabled'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://blog.3or.de/mimilib-dhcp-server-callout-dll-injection.html
• https://technet.microsoft.com/en-us/library/cc726884(v=ws.10).aspx
• https://msdn.microsoft.com/de-de/library/windows/desktop/aa363389(v=vs.85).aspx