I Solemnly Swear I Am Up To No Good. Introducing the Marauders Map

This blogpost will be a bit different, as it's going to tell a bit of a story... In this blogpost I want to achieve 2 objectives: address a question I keep hearing and seeing pop up in my DM every now and then, "how do I become a red teamer/ how do I become a … Continue reading I Solemnly Swear I Am Up To No Good. Introducing the Marauders Map

Tap tap… is this thing on? Creating a notification-service for Cobalt-Strike

Ever needed a notifier when a new beacon checks in? Don't want to keep checking your Cobalt-Strike server every 5 minutes in the hopes of a new callback? We got you covered! Introducing the notification-service aggressor script available athttps://github.com/NVISOsecurity/blogposts/tree/master/cobalt-strike-notifier If the above image resonates with you, you'll know that the point between sending out your … Continue reading Tap tap… is this thing on? Creating a notification-service for Cobalt-Strike

Unmanaged file searching with Filesearcher.exe

During our red team engagements, we are often reliant on a command and control infrastructure. Typically these infrastructures are capable of loading .NET assemblies in memory, which gave me the idea of coding a filesearcher assembly. This was partially invented because of a CTF event I was participating in which had me hunting several file … Continue reading Unmanaged file searching with Filesearcher.exe

Sigma engine adds support for ee-outliers backend: start tagging your Sigma hits in Elasticsearch!

Introduction We are happy to announce that the awesome people maintaining the Sigma project on GitHub have merged our work to support the ee-outliers backend! So what you can you do with this? Sigma already contained support for Elasticsearch through the es-dsl and es-qs backends. However, these generate queries then need to be integrated by … Continue reading Sigma engine adds support for ee-outliers backend: start tagging your Sigma hits in Elasticsearch!

Email alerting on geographically suspicious firewall connections using logalert.py, geoiplookup and AbuseIPDB

Introduction Earlier this week, we released logalert.py, a simple python tool that can be used to pipe standard output to email for the purpose of alerting. In this blog post we want to give a concrete example of how logalert.py can be used to get simple & reliable email notifications about suspicious firewall connections, based on … Continue reading Email alerting on geographically suspicious firewall connections using logalert.py, geoiplookup and AbuseIPDB

Releasing logalert.py – Smart piping of command output to email for alerting

Introduction Today we are releasing a small but useful tool, logalert.py. This tool can be used to pipe standard output to email for the purpose of alerting. A simple caching system is used to avoid sending duplicate alerts within a certain timeframe. The tool was developed for cases where you want a simple and robust … Continue reading Releasing logalert.py – Smart piping of command output to email for alerting

My journey reaching #1 on Hack The Box Belgium – 10 tips, tricks and lessons learned.

Ranked #1 on HackTheBox Belgium Not so long ago, I achieved a milestone in my penetration testing career.: reaching rank 1 on HackTheBox. For those of you that don't know what Hack The Box (HTB) is: Hack The Box is an online platform allowing you to test your penetration testing skills and exchange ideas and … Continue reading My journey reaching #1 on Hack The Box Belgium – 10 tips, tricks and lessons learned.