DDoS prevention is a hot topic. DDoS attacks have become a weapon of choice for malicious actors to conduct cyberattacks. I did a posting on Defending Against Apache Web Server DDoS Attacks and contributed to a DDoS: Proactive and reactive measures document from CERT.be.
One of the mitigation measures that you can apply is doing country based IP filtering. This basically limits access to your network from a limited set of prefixes. I consider this … Read more.
I recently had a presentation and information session for human right activists on how to secure their group communication and data sharing.
The target audience was non-technical using different operating systems (Windows, Linux and OSX) and using both default laptops and mobile devices (primarily Android based).
I uploaded the presentation to SlideShare.
Secure Communication from Koen Van Impe
Open source intelligence is collecting information from publicly available resources. If you are doing incident handling it’s one of the things that will use up a lot of your time. And it can quickly become very tedious. Imagine a list of IPs that you found hosts on your network connecting to. Query different public available resources (VirusTotal, Shodan, SANS, Cymon, XForce Exchange, …) for each and every IP and then converting that data into one … Read more.
The short answer : no, TOR exit nodes do not alter your content.
A recent post by @adrellias got my attention. The link in the post refers to an article where a user spots a case of content (Javascript) injection by Vodafone. The details can be found in the blogpost Am I hacked? Oh, it’s just Vodafone. Needless to say this is very bad behavior by Vodafone.
Vodafone eavesdrops on your conversation, causing this to … Read more.
This is the second part of a post on doing open source intel with recon-ng. The first part focused on gathering open source information for user accounts. This second part focuses on gathering domain and host information.
I started with one single domain. I’m interested in what other hosts related to this domain can be found. To do this I use the search command SEARCH domains-hosts.
The list shows modules that use for example Baidu, … Read more.
recon-ng is a tool for open source reconnaissance. Reconnaissance is the first phase in a penetration test and it is the act of gathering preliminary data or intelligence on your target.
Recon-ng has a look and feel similar to the Metasploit Framework and provides an easy to use interface to gather open source intelligence.
This is a post on doing open source intel with recon-ng. The post is split in two parts :
the … Read more.
I had a post published on the IBM Security Intelligence website : Defending Against Apache Web Server DDoS Attacks. I cover the use of the modules Modsecurity, mod_evasive and Fail2ban for protecting Apache web servers.
If you’re looking for general information on how to deal with DDoS attacks then have a look at the whitepaper DDoS: Proactive and reactive measures. That document serves as a guideline, help and advice for the Belgian public and private … Read more.
Industrial Control Systems or ICS have received a lot of attention lately. In the US the ICS-CERT was established and ENISA has a whole unit devoted to Industrial Control Systems/SCADA. But for most people working in IT it is still a relatively new playing field.
Because every area in technology has its own specific vocabulary I wrote a small intro to PLCs, ICS and SCADA of the different components that play in the ICS field.
… Read more.
I have been working with honeypots for a long time. I consider them one of the best sources for statistics and ongoing trend. Most importantly they give insight information on new exploit and attacker activity.
In the past I used my own set of tools to collect the information from different honeypots. The tools are available on GitHub cudeso-honeypot. I have an old blog post on ‘Using ELK as a dashboard for honeypots’.
Since … Read more.
In two previous posts I covered “What is netflow and when do you use it?” and “Use netflow with nfdump and nfsen“.
Nfsen provides a web interface on netflow data made available via nfdump. Because of the nature of the netflow data it is important to have strict access controls and extensive logging on the nfsen access. You should have a complete access and query log of who did what at any given time.
Access … Read more.
Graphs made with cudeso posts stats
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