Mario Lechończak

Data exfiltration is the unauthorized transfer of data from an organization’s systems to an external destination controlled by an attacker. In AWS environments, one of the most common exfiltration vectors involves copying data from company S3 buckets to attacker-controlled ones. It’s deceptively simple, surprisingly effective, and — if you’re not prepared — almost impossible to detect in time. In this article, we’ll walk through a realistic attack scenario step by step, and then close the door on the attacker — one layer at a time....

I’m thrilled to announce that I’ve been accepted into the AWS Community Builders program — specifically in the Networking & Content Delivery category. Networking has been my core focus for a while now, and being recognized as part of this community means a lot to me. The AWS Community Builders program is an initiative by Amazon Web Services that connects AWS enthusiasts and technical practitioners who are passionate about sharing knowledge with the broader community....

It has been an incredibly busy and productive start to 2026. If you’ve followed my work for a while, you know that at my core, I am a Network Engineer. However, I’ve always believed that a solid understanding of the “pipes” is only half the battle. My curiosity for how the rest of the stack lives and breathes has driven me to spend this quarter bridging the gap between traditional infrastructure and modern cloud-native ecosystems....