Collaborate Disseminate
[This is a Guest Diary by Alec Jaffe, an ISC intern as part of the SANS.edu Bachelor&#;39;s Degree in Applied Cybersecurity (BACS) program [1].
(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License. Continue reading ISC Stormcast For Wednesday, April 15th, 2026 https://isc.sans.edu/podcastdetail/9892, (Wed, Apr 15th)
Starting March 10, 2026, my DShield sensor started getting probe for various AI models such as claude, openclaw, huggingface, etc. Reviewing the data already reported by other DShield sensors to ISC, the DShield database shows reporting of these probes started that day and has been active ever since.
This month&#;x26;#;39;s Microsoft Patch Tuesday looks like a record one, but let&#;x26;#;39;s look at it a bit closer to understand what is happening
Continue reading Microsoft Patch Tuesday April 2026., (Tue, Apr 14th)
(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License. Continue reading ISC Stormcast For Tuesday, April 14th, 2026 https://isc.sans.edu/podcastdetail/9890, (Tue, Apr 14th)
Last week, I wrote about attackers scanning for various webshells, hoping to find some that do not require authentication or others that use well-known credentials. But some attackers are paying attention and are deploying webshells with more difficult-to-guess credentials. Today, I noticed some scans for what appears to be the “EncystPHP” web shell. Fortinet wrote about this webshell back in January. It appears to be a favorite among attackers compromising vulnerable FreePBX systems.
Continue reading Scans for EncystPHP Webshell, (Mon, Apr 13th)
(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License. Continue reading ISC Stormcast For Monday, April 13th, 2026 https://isc.sans.edu/podcastdetail/9888, (Mon, Apr 13th)
I spotted an interesting piece of JavaScript code that was delivered via a phishing email in a RAR archive. The file was called “cbmjlzan.JS†(SHA256:a8ba9ba93b4509a86e3d7dd40fd0652c2743e32277760c5f7942b788b74c5285) and is only identified as malicious by 15 AV’s on VirusTotal[1].
Continue reading Obfuscated JavaScript or Nothing, (Thu, Apr 9th)
(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License. Continue reading ISC Stormcast For Thursday, April 9th, 2026 https://isc.sans.edu/podcastdetail/9886, (Thu, Apr 9th)
In a previous diary [1], we looked to see how numbers were used within passwords submitted to honeypots. One of the items of interest was how dates, and more specifically years, were represented within the data and how that changed over time. It is often seen that years and seasons are used in passwords, especially when password change requirements include frequenty password changes. Some examples we might see today:
Continue reading Number Usage in Passwords: Take Two, (Thu, Apr 9th)