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I also have a site with (outdated) Linux information.

Latest posts

Monitor your public assets via Shodan

Shodan is a powerful tool for doing passive reconnaissance. It’s also a great source of information that you can put to good use to monitor your publicly available assets. Shodan acts as a search engine (also see: : What is Shodan.io?), whatever that is connected to the internet will get indexed by their crawlers.

I wrote a script that takes one parameter (ideally a string) and

Fetches the information that is available at Shodan forRead more.

What is Shodan?

Somebody at $work asked me to give some more insight on Shodan, what it is and how you can put it to good use. I shared the presentation on Slideshare.

What is shodan from Koen Van Impe

Test driving Microsoft Log Analytics

Centralized logging is essential during incident response. If you can only rely on local logs then you risk losing crucial information when reconstructing the timeline of a security incident. Local logs should not be trusted during an incident as they might have been altered by an intruder. Additionally centralized logging allows you to combine different log sources into one data set for investigation.

I used a couple of centralized log solutions in the past, includingRead more.

NotPetya / ExPetr information

I updated my page on WannaCry with information on the latest NotPetya ransomware attack : https://www.wannacry.be.

Secure Windows File Copy – Secure FTP

There are several solutions for copying files between Windows hosts, the protocol that most file transfers in the Windows world will default to is SMB (yes, thats the same protocol as used by Wannacry). What alternatives are available? The pre-requisites are

Audit and logging capabilities, each transfer should be logged; One central server where files get pushed to and pulled from; Authentication, before a file transfer can happen, the user should authenticate; Secure transfer ofRead more.


Both Dragos and ESET released two reports on the analysis of malware attacking power grids.

According to Dragos the adversary group labeled as ELECTRUM is responsible for the cyber attack on the Ukraine electric grid in 2016.

I created a mindmap based on the info in the Dragos document. It’s available on https://github.com/cudeso/tools/tree/master/CRASHOVERRIDE

https://www.us-cert.gov/ncas/alerts/TA17-163A https://www.welivesecurity.com/wp-content/uploads/2017/06/Win32_Industroyer.pdf https://dragos.com/blog/crashoverride/

Kerberos made easy

Kerberos is an authentication protocol that works on the basis of tickets that allows clients to connect to services over an insecure network and still allow clients to prove their identity in a secure manner.

The steps described below are a compilation of what I found when reading on Kerberos. Feel free to share your comments!

These are the steps necessary for a client to obtain an authenticated and verified request to a service (forRead more.

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!