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!

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.

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.

What is Shodan telling us about ICS in Belgium?

I have been using Shodan, “the world’s first search engine for Internet-connected devices”, since a long time. Recently I switched my free account to a membership account. A membership account allows you to do API queries with additional query filters (for example restricting search results to specific countries).

In this post I describe the results of querying the Shodan API for ICS (or related) devices in Belgium. These results are entirely based on what isRead more.

Hack of Polish Financial Supervision Authority and Polish banks

A couple of days back the financial sector in Poland was shocked by the news that the Polish financial supervision authority was hacked and was used as an attack vector to get access to other (mostly Polish) banks.

This is a very short summary with some IOCs (Indicator of Compromise) that you can use to check your logs and verify if you are affected.

Note that most of this information is composed from information foundRead more.

Calendar invite spam

I received some unusual calendar invite spam. In total in consisted of 4 messages :

a calendar invite quickly followed by the cancellation of the invite a new calendar invite the cancellation of the last invite

Calendar invite spam isn’t that uncommon but compared to the total amount of spam the amount of calendar invite spam is still fairly low.

In this case I found the series of messages (invite – cancelRead more.

Don’t Let Remote Management Software Contribute to Building Botnets

I published an article on IBM Security Intelligence on Don’t Let Remote Management Software Contribute to Building Botnets.

MISP EcoSystem : Threat Intelligence, VMRay and MISP

I made a slide-deck on integrating MISP and VMRay in your incident management workflow.

MISP EcoSystem – Threat Intelligence, VMRay, MISP from Koen Van Impe