I published an article on IBM Security Intelligence on Simplifying Risk Management.
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 is … Read more.
I’m a happy user of MISP, Malware Information Sharing Platform & Threat Sharing. MISP core already contains a lot of features to satisfy your needs when it concerns threat and information sharing. But there’s always room for improvement. If you submit a feature request, MISP can be extended with your request. However changing the core is not always desirable. Also sometimes you want some feature to work just the way you want it, this doesn’t … Read more.
I published an article on The Krebs Attack: Sign Of A Game Changer on the Ipswitch blog.
This article lists the new wave of large scale DDoS attacks against KrebsOnSecurity and OVH and how the release of the Mirai botnet source code can leverage new attacks. I describe how this influences the risks you have to take into account when protecting your infrastructure.
When you do incident response having access to detailed logs is crucial. One of those treasure troves are proxy server logs.
Proxy server logs contain the requests made by users and applications on your network. This does not only include the most obvious part : web site request by users but also application or service requests made to the internet (for example application updates).
Ideally you have a transparent proxy, meaning that all outgoing requests … Read more.
One of the recent incidents I had to handle involved a compromised webhost. This allowed me to do some Exploring webshells on a WordPress site. In the aftermath of the investigation I searched for tools that could have improved my tasks (evaluating which files might have been compromised).
One of the approaches I had in mind was take a hash of every file and then verify that hash with Virustotal. This would have worked in … Read more.
Passive DNS describes an historical database of DNS resolutions. I’ve written a previous post on Using Passive DNS for Incident Response, more specifically combining it with Moloch.
If you run your own corporate -internal- nameservers it makes sense to monitor what domains have been queried and what results were returned in the past. You can use the collection of internal queries for future incident response. You can use this collected information to cross-check with information … Read more.
SANS ISC recently posted an article on The Dark Side of Certificate Transparency.
Certificate transparency means that participating certificate authorities will publish all certificates that they issue in a log. This information is public, meaning that you can search it at will.
The article already touches one of the side effects of having this information publicly available. By publishing the information organizations can disclose hostnames they’d rather not be known on the internet.
There are … Read more.
I published an article on the SPF and DKIM spam filtering mechanisms on IBM Security Intelligence : Understanding the SPF and DKIM Spam Filtering Mechanisms.
The article covers the basic details of these mechanisms but also explains some of the possible pitfalls for filtering spam with SPF and DKIM.
Dealing with security incidents is always a collaborative process, involving both your constituency and external players. There are a number of tools that help you with detecting (and preventing) incidents. One of those tools is for example the MISP – Malware Information Sharing Platform & Threat Sharing
But once you have an incident … how you deal with it? Everyone has (or should have) written their own incident response procedures but did you know that … Read more.