A9 Development: A blog by Agrajag9

I think the title says a lot here: if you want to defend your information systems, you should switch from blacklisting to whitelisting. But what does that mean? Most people hear "whitelisting" in terms of CND and think "application whitelisting". But there's so many more places to do it! You already hopefully do outbound whitelisting on your firewall. You aren't really  allowing any system to talk out on TCP/3389, right? You do have a DEFAULT:DENY or DENY ANY,ANY down at the bottom of your firewall rules, right? But have you considered whitelisting outbound web traffic at your proxy as well? Most people think of their web proxy reputation lists as block lists, and for good reason: most of them are incomplete. But did you ever consider that maybe that incompleteness as a defensive measure? If you block unknown websites at your web proxy, you're going to block a huge amount of malicious websites. You're probably thinking to yourself but what abou...

I want to start a series of posts on how to do CND/DFIR/CTI on a budget. I've spent the last decade of my life working in the IT world. I spent about half that time working as a part-time administrator/engineer in a small datacenter within a large corporation. I touched a lot of tech during that time frame and adopted a significant amount of it into my own homelab. But the last five years of my life have been devoted to CND/DFIR/CTI. One of the things I've experienced working in this field has been the vast differences between the large and small companies in terms of capabilities. My current job involves sharing CTI with a wide variety of companies with a wide variety of maturity in terms of CND/DFIR/CTI capabilities. A common complaint I hear from the small-/medium-sized companies is that they could never keep up with the bigger companies because they lack resources. If you fall into this bucket, then this series is for you. A few problems I hope to solve on shoestring ...