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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.

I also have a site with (outdated) Linux information.

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Latest posts

WannaCry / Wcry / WannaCrypt help / advice

I compiled a list of -hopefully- useful tips and help for dealing with the WannaCry ransomware. I try to keep the page updated as soon as new information is available.

See https://www.wannacry.be/. Feedback is welcome!

What could have limited the impact of the WannaCry / Wcry / WannaCrypt ransomware?

A major wave of ransomware called WannaCry / Wcry / WannaCrypt has hit many organizations around the world, causing panic among many users, system administrators and security professionals. The details of the ransomware have been covered in detail at other posts

Everything you need to know about the WannaCry / Wcry / WannaCrypt ransomware Player 3 Has Entered the Game: Say Hello to ‘WannaCry’ Massive outbreak of ransomware variant infects large amounts of computers aroundRead more.

ipv6: Neighbour table overflow

One of my virtual machines hosted at Gandi had an excessive amount of error messages

The cause of this error message are the IPv6 router announcements that try to discover and configure the IPv6 neighbourhood. The excessive amount of messages were polluting the logs.

After contacting the Gandi helpdesk they provided insight on the cause of the error message and provided mitigations to prevent these type of errors. I had to update /etc/sysctl.conf withRead more.

The Apache Struts 2 Vulnerability and the Importance of Patch Management

I published an article on IBM Security Intelligence on The Apache Struts 2 Vulnerability and the Importance of Patch Management.

The post describes a vulnerability in Struts 2, a free, open source framework for creating Java web applications that allows attackers to execute arbitrary code.

Simplifying Risk Management

I published an article on IBM Security Intelligence on Simplifying Risk Management.