Passive DNS is not a new technique but, for the last months, there was more and more noise around it. Passive DNS is a technique used to record all resolution requests performed by DNS resolvers (bigger they are, bigger they will collect) and then allow to search for historical data.
I published the following diary on isc.sans.edu: “Malicious Powershell Script Dissection”: Here is another example of malicious Powershell script found while hunting. Such scripts remain a common attack vector and many of them can be easily detected just by looking for some specific strings. Here is an example of YARA
The use of a wall of sheep (or WoS) is nice to raise the security awareness of your audience. A WoS is a tool used to demonstrate what can happen when users connect to a wild network without a minimum level of security. The non-encrypted traffic is analyzed and evidence of bad behaviour is displayed publicly
I published the following diary on isc.sans.edu: “Dissecting Malicious Office Documents with Linux”: A few months ago, Rob wrote a nice diary to explain how to dissect a (malicious) Office document (.docx). The approach was to use the OpenXML SDK with Powershell. This is nice but how to achieve the
I published the following diary on isc.sans.edu: “Diving into Malicious AutoIT Code”: Following my yesterday diary, I had a deeper look at the malicious AutoIT script dropped in my sandbox. For those who are not aware of AutoIT, it is a BASIC-like scripting language designed for automating Windows tasks. If
I published the following diary on isc.sans.edu: “Malicious Powershell using a Decoy Picture“: I found another interesting piece of malicious Powershell while hunting. The file size is 1.3MB and most of the file is a PE file Base64 encoded. You can immediately detect it by checking the first characters of
Here we go with the last wrap-up of the 2018 edition! The first presentation was about worms: “Worms that turn: nematodes and neotodes” by Matt Wixey. The first slide contained the mention: “for educational purposes only”. What could we expect? The idea of the research performed by Matt was interesting.
The second day started early with an eye-opener talk: “IPC – the broken dream of inherent security” by Thanh Bui. IPC or “Inter-Process Communications” are everywhere. You can compare them as a network connection between a client and a server but inside the operating system. The idea of Thanh’s research was
The 14th edition (!) of hack.lu is ongoing in Luxembourg. I arrived yesterday to attend the MISP summit which was a success. It’s great to see that more and more people are using this information sharing platform to fight bad guys! Today, the conference officially started with the regular talk. I
I published the following diary on isc.sans.edu: “More Equation Editor Exploit Waves“: This morning, I spotted another wave of malicious documents that (ab)use again CVE-2017-11882 in the Equation Editor (see my yesterday’s diary). This time, malicious files are RTF files. One of the samples is SHA256:bc84bb7b07d196339c3f92933c5449e71808aa40a102774729ba6f1c152d5ee2 (VT score: 19/57)… [Read more]