New Capture Session Launched Via DXCap.EXE — Sigma Rule

Rule metadata and linked tags

Author: Beyu Denis, oscd.community, Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2019-10-26 / 2022-06-09.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 46978515ba9bad33a8eb60818c71150ed4a577a89ed6fb927221a4a55c290aa8

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: New Capture Session Launched Via DXCap.EXE
id: 60f16a96-db70-42eb-8f76-16763e333590
status: test
description: |
    Detects the execution of "DXCap.EXE" with the "-c" flag, which allows a user to launch any arbitrary binary or windows package through DXCap itself. This can be abused to potentially bypass application whitelisting.
references:
    - https://lolbas-project.github.io/lolbas/OtherMSBinaries/Dxcap/
    - https://twitter.com/harr0ey/status/992008180904419328
author: Beyu Denis, oscd.community, Nasreddine Bencherchali (Nextron Systems)
date: 2019-10-26
modified: 2022-06-09
tags:
    - attack.stealth
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\DXCap.exe'
        - OriginalFileName: 'DXCap.exe'
    selection_cli:
        CommandLine|contains: ' -c ' # The ".exe" is not required to run the binary
    condition: all of selection*
falsepositives:
    - Legitimate execution of dxcap.exe by legitimate user
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate execution of dxcap.exe by legitimate user

Source references

• https://lolbas-project.github.io/lolbas/OtherMSBinaries/Dxcap/
• https://twitter.com/harr0ey/status/992008180904419328