I published the following diary on isc.sans.edu: “A Backdoor with Smart Screenshot Capability“: Today, everything is “smart” or “intelligent”. We have smartphones, smart cars, smart doorbells, etc. Being “smart” means performing actions depending on the context, the environment, or user actions. For a while, backdoors and trojans have implemented screenshot
I published the following diary on isc.sans.edu: “A First Malicious OneNote Document“: Attackers are always trying to find new ways to deliver malware to victims. They recently started sending Microsoft OneNote files in massive phishing campaigns. OneNote files (ending the extension “.one”) are handled automatically by computers that have the
I published the following diary on isc.sans.edu: “Do you collect “Observables” or “IOCs”?“: Indicators of Compromise, or IOCs, are key elements in blue team activities. IOCs are mainly small pieces of technical information that have been collected during investigations, threat hunting activities or malware analysis. About the last example, the malware analyst’s goal
I published the following diary on isc.sans.edu: “Another Script-Based Ransomware“: In the past, I already found some script-based ransomware samples written in Python or Powershell. The last one I found was only a “proof-of-concept” (my guess) but it demonstrates how easy such malware can be developed and how they remain
I published the following diary on isc.sans.edu: “Malicious Python Script Behaving Like a Rubber Ducky“: Last week, it was SANSFIRE in Washington where I presented a SANS@Night talk about malicious Python scripts in Windows environment. I’m still looking for more fresh meat and, yesterday, I found another interesting one. Do you
I published the following diary on isc.sans.edu: “Malicious PowerShell Targeting Cryptocurrency Browser Extensions“: While hunting, I found an interesting PowerShell script. After a quick check, my first conclusion was that it is again a simple info stealer. After reading the code more carefully, the conclusion was different: It targets crypto-currency browser
I published the following diary on isc.sans.edu: “Houdini is Back Delivered Through a JavaScript Dropper“: Houdini is a very old RAT that was discovered years ago. The first mention I found back is from 2013! Houdini is a simple remote access tool written in Visual Basic Script. The script is not very interesting
I published the following diary on isc.sans.edu: “Sandbox Evasion… With Just a Filename!“: Today, many sandbox solutions are available and deployed by most organizations to detonate malicious files and analyze their behavior. The main problem with some sandboxes is the filename used to submit the sample. The file can be
I published the following diary on isc.sans.edu: “A ‘Zip Bomb’ to Bypass Security Controls & Sandboxes“: Yesterday, I analyzed a malicious archive for a customer. It was delivered to the mailbox of a user who, hopefully, was security-aware and reported it. The payload passed through the different security layers based on big
I published the following diary on isc.sans.edu: “Use Your Browser Internal Password Vault… or Not?“: Passwords… a so hot topic! Recently big players (Microsoft, Apple & Google) announced that they would like to suppress (or, at least, reduce) the use of classic passwords. In the meantime, they remain the most common
