I published the following diary on isc.sans.edu: “Keeping an Eye on Malicious Files Life Time“: We know that today’s malware campaigns are based on fresh files. Each piece of malware has a unique hash and it makes the detection based on lists of hashes not very useful these days. But
I published the following diary on isc.sans.edu: “Collecting IOCs from IMAP Folder“: I’ve plenty of subscriptions to “cyber security” mailing lists that generate a lot of traffic. Even if we try to get rid of emails, that’s a fact: email remains a key communication channel. Some mailing lists posts contain
I published the following diary on isc.sans.edu: “Powershell Payload Stored in a PSCredential Object“: An interesting obfuscation technique to store a malicious payload in a PowerShell script: In a PSCredential object! The PSCredential class can be used to manage credentials in a centralized way. Just have a look at this example. First, let’s encrypt
I published the following diary on isc.sans.edu: “Malicious Excel With a Strong Obfuscation and Sandbox Evasion“: For a few weeks, we see a bunch of Excel documents spread in the wild with Macro V4. But VBA macros remain a classic way to drop the next stage of the attack on the
I published the following diary on isc.sans.edu: “Weaponized RTF Document Generator & Mailer in PowerShell“: Another piece of malicious PowerShell script that I found while hunting. Like many malicious activities that occur in those days, it is related to the COVID19 pandemic. Its purpose of simple: It checks if Outlook
I published the following diary on isc.sans.edu: “Obfuscated with a Simple 0x0A“: With the current Coronavirus pandemic, we continue to see more and more malicious activity around this topic. Today, we got a report from a reader who found a nice malicious Word document part of a Coronavirus phishing campaign. I
I published the following diary on isc.sans.edu: “Malicious JavaScript Dropping Payload in the Registry“: When we speak about “fileless” malware, it means that the malware does not use the standard filesystem to store temporary files or payloads. But they need to write data somewhere in the system for persistence or
I published the following diary on isc.sans.edu: “Very Large Sample as Evasion Technique?“: Security controls have a major requirement: they can’t (or at least they try to not) interfere with normal operations of the protected system. It is known that antivirus products do not scan very large files (or just
I published the following diary on isc.sans.edu: “COVID-19 Themed Multistage Malware“: More and more countries are closing their borders and ask citizens to stay at home. The COVID-19 virus is everywhere and also used in campaigns to lure more victims who are looking for information about the pandemic. I found
I published the following diary on isc.sans.edu: “Agent Tesla Delivered via Fake Canon EOS Notification on Free OwnCloud Account“: For a few days, there are new waves of Agent Tesla landing in our mailboxes. I found one that uses two new “channels” to deliver the trojan. Today, we can potentially receive
