Open Relay Abuse
March 31, 2022
The story I really didn’t give much attention to the ‘Country analysis’ world heatmap tab on the SIP honeypot data web interface till I one day noticed that every hour there were over 100 unique IP addresses from the US attacking my honeypots. Checking the database I noticed a pattern in the format of the stored headers in the database. Next I checked the source IPs of the suspicious traffic in Shodan.
Hide From Shodan
October 14, 2021
If you are planning on exposing your private VoIP server to the public internet but are concerned about hacks and attacks, I might have one trick to help keep you hidden. When looking for a website to answer your questions, most people turn to Google. On the other hand, when looking for applications, IPs or network ports exposed on the internet, Shodan.io is usually the first stop. Shodan offers a service, dare I say, like Google, that scans the internet.
Understanding VoIP Hackers
September 1, 2021
Ever since I realized how easy it was to detect potential VoIP fraudsters using the SIP User Agent header , I got more and more interested in finding out how to detect them and more importantly figuring out their thought process. I believe that there is a lot you can learn from looking at the smart techniques fraudsters are using rather than just assuming what they are up to. How best to learn, apart from looking through your logs after you have been hacked, than to create a honeypot, gather data and learn from it.