Welcome!
I’m Koen 
. I live in Bruges (Belgium), a splendid medieval city also known as the Venice of the North.
I’m involved with computer security and I work as a freelancer in incident response, incident coordination, threat intelligence, vulnerability management and security best practices. Basically all tasks related to managing a CSIRT / CERT (Computer Emergency Response Team).
My main interests in computers are security, web applications (PHP, MySQL, Apache), system administration and free software.
This site hosts a blog and I have a photo collection at Flickr.
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I published a blog article on the MISP project website on how to do the MISP to Azure / Sentinel integration. This integration allows you to upload indicators from MISP to Microsoft Sentinel. It relies on PyMISP to get indicators from MISP and an Azure App and Threat Intelligence Data Connector in Azure.
Read the full article at MISP project website : MISP to Sentinel integration.
The integration is available via GitHub at https://github.com/cudeso/misp2sentinel
This … Read more.
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In most MISP instances the database (MySQL or MariaDB) is on a local network, either directly on the machine or on a local DB-cluster. As a lot of organisations are moving towards a “full cloud” environment, this also means that they want to start making use of the database features offered by their cloud providers.
Microsoft offers Azure Database for MySQL and in this post I list the (limited) steps required to migrate the MISP … Read more.
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Zeek (formerly Bro) is a free and open-source software network analysis framework. It gives insights on DNS queries, HTTP and TLS information and details on transmitted files. I find Zeek one of the best network monitoring tools available to provide detailed visibility on network traffic.
Zeek has a built-in intelligence framework. This framework allows you to add information received via MISP directly into the network visibility capabilities of Zeek. This includes
Visits to URLs or … Read more.
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I contributed to the ENISA Threat Landscape 2022. The ETL is an annual report on the status of the cybersecurity threat landscape. It identifies the top threats, major trends observed with respect to threats, threat actors and attack techniques, as well as impact and motivation analysis. It also describes relevant mitigation measures.
Get a copy of the ENISA Threat Landscape 2022.
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The first edition of the Cyber Threat Intelligence Summit took place in Luxembourg in October 2022. I did two presentations:
One presentation on MISP web scraper, a tool to create MISP events and reports from scraped websites; and one presentation on building CTI Operational Procedures with Jupyter Notebooks and PyMISP.
The slides and recording are available on GitHub and Youtube.
Slides: https://github.com/cudeso/misp-tip-of-the-week/tree/main/CTIS-2022; Recording of CTI Operational Procedures with Jupyter Notebooks and PyMISP; Recording of MISP … Read more.
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Chainsaw is a tool to rapidly search through large sets of Windows Event logs. In this post I briefly go through the steps that I take to collect, process and analyse logs from different Windows machines and then use them for analysing Windows Event logs. Obviously it’s always better to use centralised logging and apply your detection techniques centrally but unfortunately this isn’t always possible.
Although Chainsaw is available as a binary package … Read more.
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I published an article on the MISP project website on the MISP web scraper.
There are a lot of websites that regularly publish reports on new threats, campaigns or actors with useful indicators, references and context information. Unfortunately only a few publish information in an easily accessible and structured format, such as a MISP-feed. As a result, we often find ourself manually scraping these sites, and then copy-pasting this information in new MISP events. These … Read more.
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Analysing firewall rules in AWS can be complex. There are Security Groups (SG) as well as Access Control Lists (ACL). Security groups are applied on instances and are the first layer of defense, whereas access control lists are applied on network components (subnets) and are a second layer of defense. A major difference is that SGs are stateful, whereas ACLs are stateless. From a filtering perspective there is also a difference. In security groups all … Read more.
