---
id: 8289
title: "Covert Exfil from a Target Network"
source_domain: netspi.com
source_url: "https://www.netspi.com/blog/technical-blog/web-application-pentesting/covert-exfil-from-a-target-network/"
published_at: "2013-05-03T00:00:00Z"
tags: ["red-team", "backdoor", "vhd", "covert-exfiltration", "diskpart", "egress-filtering"]
phying_url: "https://phying.com/item/8289"
lang: en
---

# Covert Exfil from a Target Network

## Summary

On a hardened network with egress rules and NTLM proxy authentication, testers used a custom beaconing backdoor and an exposed 22 GB VHD mounted via diskpart for covert data exfiltration.

## Intelligence Metadata

- **Sources:** netspi.com
- **Published:** 2013-05-03T00:00:00Z
- **Original:** https://www.netspi.com/blog/technical-blog/web-application-pentesting/covert-exfil-from-a-target-network/
- **Phying News:** https://phying.com/item/8289