Today, I published the following diary on isc.sans.edu: “Suspicious IP Addresses Avoided by Malware Samples“: Modern malware samples implement a lot of anti-debugging and anti-analysis techniques. The idea is to slow down the malware analyst’s job or, more simply, to bypass security solutions like sandboxes. These days, I see more and more malware
Today, I published the following diary on isc.sans.edu: “Deobfuscation of Malware Delivered Through a .bat File“: I found a phishing email that delivered a RAR archive (password protected). Inside the archive, there was a simple .bat file (SHA256: 57ebd5a707eb69dd719d461e1fbd14f98a42c6c3dcb8505e4669c55762810e70) with the following name: “SRI DISTRITAL – DPTO DE COBRO -SRI
Today, I published the following diary on isc.sans.edu: “The Importance of Malware Triage“: When dealing with malware analysis, you like to get “fresh meat”. Just for hunting purposes or when investigating incidents in your organization, it’s essential to have a triage process to reduce the noise and focus on really
Today, I published the following diary on isc.sans.edu: “Malicious Code Can Be Anywhere“: My Python hunting rules reported some interesting/suspicious files. The files are named with a “.ma” extension. Some of them have very low VT scores. For example, the one with a SHA256 dc16115d165a8692e6f3186afd28694ddf2efe7fd3e673bd90690f2ae7d59136 has a score of 15/59.
Today, I published the following diary on isc.sans.edu: “Malware Delivered Through .inf File“: Microsoft has used “.inf” files for a while. They are simple text files and contain setup information in a driver package. They describe what must be performed to install a driver package on a device. When you
Yesterday, I published the following diary on isc.sans.edu: “Undetected PowerShell Backdoor Disguised as a Profile File“: PowerShell remains an excellent way to compromise computers. Many PowerShell scripts found in the wild are usually obfuscated. Most of the time, this helps to have the script detected by fewer antivirus vendors. Yesterday,
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
