Author Archives: SANS Internet Storm Center, InfoCON: green

Our API (https://isc.sans.edu/api) continues to be quite popular. One query we see a lot is lookups for individual IP addresses. Running many queries as you go through a log may cause you to get locked out by our rate limit. To help with that, we now offer additional “summary feeds” that include all data recently received. You may download these feeds and import them in your database of choice (or grep the text file for records). This will make bulk lookups a lot easier and faster.

Continue reading Some new Data Feeds, and a little “incident”., (Thu, Mar 20th)→

(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License. Continue reading ISC Stormcast For Thursday, March 20th, 2025 https://isc.sans.edu/podcastdetail/9372, (Thu, Mar 20th)→

In September, Cisco published an advisory noting two vulnerabilities [1]:

Continue reading Exploit Attempts for Cisco Smart Licensing Utility CVE-2024-20439 and CVE-2024-20440, (Wed, Mar 19th)→

(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License. Continue reading ISC Stormcast For Wednesday, March 19th, 2025 https://isc.sans.edu/podcastdetail/9370, (Wed, Mar 19th)→

One of my hunting rules triggered some suspicious Python code, and, diving deeper, I found an interesting example of DLL side-loading. This technique involves placing a malicious DLL with the same name and export structure as a legitimate DLL in a location the application checks first, causing the application to load the malicious DLL instead of the intended one. This is a classic vulnerability seen for years in many software. The attacker also implemented simple tricks to bypass classic security controls.

Continue reading Python Bot Delivered Through DLL Side-Loading, (Tue, Mar 18th)→

(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License. Continue reading ISC Stormcast For Tuesday, March 18th, 2025 https://isc.sans.edu/podcastdetail/9368, (Tue, Mar 18th)→

I wanted to figure out how to statically decode the GUID encoded shellcode Xavier wrote about in his diary entry “Shellcode Encoded in UUIDs“.

Continue reading Static Analysis of GUID Encoded Shellcode, (Mon, Mar 17th)→

(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License. Continue reading ISC Stormcast For Monday, March 17th, 2025 https://isc.sans.edu/podcastdetail/9366, (Mon, Mar 17th)→

Last October, Forescout published a report disclosing several vulnerabilities in DrayTek routers. According to Forescount, about 700,000 devices were exposed to these vulnerabilities [1]. At the time, DrayTek released firmware updates for affected routers [2]. Forescout also noted that multiple APTs targeting devices.

Continue reading Mirai Bot now incroporating (malformed?) DrayTek Vigor Router Exploits, (Sun, Mar 16th)→

(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License. Continue reading ISC Stormcast For Friday, March 14th, 2025 https://isc.sans.edu/podcastdetail/9364, (Fri, Mar 14th)→