Tap Installer Execution — Sigma Rule

Rule metadata and linked tags

Author: Daniil Yugoslavskiy, Ian Davis, oscd.community. Source status: test; severity: medium. Source dates: 2019-10-24 / 2023-12-11.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 4813ae17ec3a81ed7acd09a67dacdcc77b65756ca6545016dcaf09bb9d137b53

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: Tap Installer Execution
id: 99793437-3e16-439b-be0f-078782cf953d
status: test
description: Well-known TAP software installation. Possible preparation for data exfiltration using tunneling techniques
references:
    - https://community.openvpn.net/openvpn/wiki/ManagingWindowsTAPDrivers
author: Daniil Yugoslavskiy, Ian Davis, oscd.community
date: 2019-10-24
modified: 2023-12-11
tags:
    - attack.exfiltration
    - attack.t1048
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\tapinstall.exe'
    filter_optional_avast:
        Image|contains:
            - ':\Program Files\Avast Software\SecureLine VPN\'
            - ':\Program Files (x86)\Avast Software\SecureLine VPN\'
    filter_optional_openvpn:
        Image|contains: ':\Program Files\OpenVPN Connect\drivers\tap\'
    filter_optional_protonvpn:
        Image|contains: ':\Program Files (x86)\Proton Technologies\ProtonVPNTap\installer\'
    condition: selection and not 1 of filter_optional_*
falsepositives:
    - Legitimate OpenVPN TAP installation
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate OpenVPN TAP installation

Source references

• https://community.openvpn.net/openvpn/wiki/ManagingWindowsTAPDrivers