I published the following diary on isc.sans.edu: “Security Monitoring: At Network or Host Level?“: Today, to reach a decent security maturity, the keyword remains “visibility”. There is nothing more frustrating than being blind about what’s happening on a network or starting an investigation without any data (logs, events) to process.
I published the following diary on isc.sans.edu: ““Lost_Files” Ransomware“: Are good old malware still used by attackers today? Probably not running the original code but malware developers are… developers! They don’t reinvent the wheel and re-use code published here and there. I spotted a ransomware which looked like an old one… [Read
I published the following diary on isc.sans.edu: “Huge Amount of remotewebaccess.com Sites Found in Certificate Transparency Logs“: I’m keeping an eye on the certificate transparency logs using automated scripts. The goal is to track domain names (and their variations) of my customers, sensitive services in Belgium, key Internet players and some
I published the following diary on isc.sans.edu: “Agent Tesla Trojan Abusing Corporate Email Accounts“: The trojan ‘Agent Tesla’Â is not brand new, discovered in 2018, it is written in VisualBasic and has plenty of interesting features. Just have a look at the MITRE ATT&CK overview of its TTP. I found a
I published the following diary on isc.sans.edu: “Rig Exploit Kit Delivering VBScript“: I detected the following suspicious traffic on a corporate network. It was based on multiples infection stages and looked interesting enough to publish a diary about it. This is also a good reminder that, just by surfing the
I published the following diary on isc.sans.edu: “Blocking Firefox DoH with Bind“: For a few days, huge debates have started on forums and mailing lists regarding the announce of Mozilla to enable DoH (DNS over HTTPS) by default in its Firefox browser. Since this announcement, Google also scheduled a move
I published the following diary on isc.sans.edu: “PowerShell Script with a builtin DLL“: Attackers are always trying to bypass antivirus detection by using new techniques to obfuscate their code. I recently found a bunch of scripts that encode part of their code in Base64. The code is decoded at execution
I published the following diary on isc.sans.edu: “Private IP Addresses in Malware Samples?“: I’m looking for some samples on VT that contains URLs with private or non-routable IP addresses (RFC1918). I found one recently and it made me curious. Why would a malware try to connect to a non-routable IP
I published the following diary on isc.sans.edu: “Malware Dropping a Local Node.js Instance“: Yesterday, I wrote a diary about misused Microsoft tools[1]. I just found another interesting piece of code. This time the malware is using Node.js[2]. The malware is a JScript (SHA256:1007e49218a4c2b6f502e5255535a9efedda9c03a1016bc3ea93e3a7a9cf739c)… [Read more]
I published the following diary on isc.sans.edu: “Malware Samples Compiling Their Next Stage on Premise“: I would like to cover today two different malware samples I spotted two days ago. They have one interesting behaviour in common: they compile their next stage on the fly directly on the victim’s computer. At
