T1567.004 Exfiltration Over Webhook

Technique: T1567.004
Tactics: Exfiltration
Research, 90 days: 1
KEV CVEs mapped: 0
SigmaHQ rules: 0
Elastic, Splunk: 2
thrunt rules: 0
Upstream: https://attack.mitre.org/techniques/T1567/004

MITRE description

Adversaries may exfiltrate data to a webhook endpoint rather than over their primary command and control channel. Webhooks are simple mechanisms for allowing a server to push data over HTTP/S to a client without the need for the client to continuously poll the server.(Citation: RedHat Webhooks) Many public and commercial services, such as Discord, Slack, and `webhook.site`, support the creation of webhook endpoints that can be used by other services, such as Github, Jira, or Trello.(Citation: Discord Intro to Webhooks) When changes happen in the linked services (such as pushing a repository update or modifying a ticket), these services will automatically post the data to the webhook endpoint for use by the consuming application. Adversaries may link an adversary-owned environment to a victim-owned SaaS service to achieve repeated [Automated Exfiltration](https://attack.mitre.org/techniques/T1020) of emails, chat messages, and other data.(Citation: Push Security SaaS Attacks Repository Webhooks) Alternatively, instead of linking the webhook endpoint to a service, an adversary can manually post staged data directly to the URL in order to exfiltrate it.(Citation: Microsoft SQL Server) Access to webhook endpoints is often over HTTPS, which gives the adversary an additional level of protection. Exfiltration leveraging webhooks can also blend in with normal network traffic if the webhook endpoint points to a commonly used SaaS application or collaboration service.(Citation: CyberArk Labs Discord)(Citation: Talos Discord Webhook Abuse)(Citation: Checkmarx Webhooks)

Research citing this technique

Reports and advisories from the last 90 days that cite this technique.

2026-08-27 Recorded Future Insikt: BlueDelta Targets Defense and Diplomacy with HOOKEDGE

Detection coverage

Elastic and Splunk rules

GitHub Webhook Created or Configuration Changed (elastic)
Unusual Network Connection to Suspicious Web Service (elastic)

Signal counts reflect the current corpus snapshot. Research citations are the technique IDs named in vendor reports and government advisories from the last 90 days; KEV mappings come from MITRE CTID. Coverage is the SigmaHQ rule inventory (core, emerging-threats, threat-hunting) plus Elastic and Splunk production rules. Rule bodies are not mirrored; links go upstream.