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International Revenue Share Fraud (IRSF)
- djkurlander 2mo ago[flagged]
- mikeaskew4 2mo agoNo comments, but thank you for sharing and staying vigilant.
- djkurlander 2mo agoThanks! Just trying to keep the world safe from marauding Teddy Bears.
- Tiberium 2mo agoA question: why are you writing this with an LLM? Can you not write with your own words, at least on HN?
- djkurlander 2mo agoAs mentioned above, wrote the blog post myself and had AI proofread and edit. As for the honeypot itself, I'm a greybeard computer scientist, and I architected the system very deliberately myself, using AI as a coding accelerator. Earlier in my career, moving from Assembly to C, I certainly appreciated the convenience of a higher level language. Same from C to C++ to Java/Lisp/Python to LLM. It's always a march to higher level languages and letting the computer do more work.
- inigyou 2mo agoFrom the rules: > Don't post generated text or AI-edited text. HN is for conversation between humans. This is why your comment has been removed.
- saaaaaam 2mo ago"Coordinated attack" might raise more than eyebrows with the legal departments of the companies you've called out. >Over the next 27 hours, in four distinct waves, all of them tried to use my VoIP (SIP) server to place phone calls on my dime. As you've clarified in your comment here the companies did not do this. Compromised machines on their networks, controlled by third parties did it.
- djkurlander 2mo agoThe actual blog post clarifies this as well. But still in some sense these organizations share some level of responsibility if it is their machines, attacking from their ASN.
- saaaaaam 2mo agoDid you use AI to write the blog post?
- djkurlander 2mo agoWrote the blog post myself, and used AI to clear up typos and occasionally improve wording. I have a PhD in computer science, but I was initially planning to pursue journalism instead, so I like to think that I can write good :-).
- richwater 2mo agoThis is quite the claim (and I'm not saying you are wrong from making it). I just would have expected some of these institutions to be better.
- djkurlander 2mo agoYes - I would have expected better from these institutions as well, but there's always going to be someone who brings their rogue laptop onto the corporate net. The key is how fast the security catches it. They can use the api that I describe in the blog to check my honeypot for their IPs. Very simple to put into a daily or hourly script.
- Oarch 2mo agoHell of an opening on this blog post. Solid write up! Glad honeypots like this exist.
- djkurlander 2mo agoMuch appreciated! Trying to help out the community with the honeypot & API, and it's always fascinating what attack patterns show up.
- kibwen 2mo agoShades of "KENNEDY SLAIN BY CIA, MAFIA, CASTRO, LBJ, TEAMSTERS, FREEMASONS": https://theonion.com/november-22-1963-1819587981/ https://theonion.com/november-22-1963-1819587981/
- djkurlander 2mo agoHa! Love it. Totally believe in it too.
- sciencejerk 2mo agoThanks for sharing your interesting research! Can you explain your honeypotting approach further? How are you "presenting" as a SIP relay? What other honeypots or protocols can you detect?
- djkurlander 2mo agoI set up servers on the net that masquerade as a SIP relay by essentially supporting the protocol but with few authentication protections. Malware bots scan the IPv4 space looking for such machines that they can use as a relay. My honeypot is actually an extensible framework, and we also can mimic SSH, Telnet, HTTP, SMB, FTP, RDP, SMTP, MQTT, Node-Red, MODB, S7, and SNMP. Individual servers can easily be set up to scan any subset of those. Check out https://knock-knock.net https://knock-knock.net to get a visual sense of what the honeypot is doing!
- elminson 2mo ago[flagged]
- inigyou 2mo agoCould they be residential proxies or does that not work in SIP? P.S. this is one reason that "pay for email" doesn't work to stop spam.
- djkurlander 2mo agoGood question. You can certainly proxy SIP. But what’s notable here is that the traffic comes directly from organizations that should be secure: banks, infrastructure, governments. For a proxy to explain it, the proxy exit node would have to be running inside those institutions, on their networks. So from a security standpoint it doesn’t really matter whether a botnet is running inside the company or the company is being used as a proxy hop. Either way, a machine on their network has been compromised. (And your P.S. is spot on. The attacker bears none of the cost; the clean IP reputation and the blame land on the compromised third party.)
- inigyou 2mo agoAre you ChatGPT or Claude?
- djkurlander 2mo agoCrafted that awesome response to your original query myself, and I am very human.