In this blog we'll look at what it takes to construct an in-memory loader for Mach-O bundles within MacOS Ventura without using dyld. We'll walk though the lower-level details of what makes up a Mach-O file, how dyld processes load commands to map areas into memory, and how we can emulate this to avoid writing payloads to disk.... Read More »
Up until recently, we've enjoyed in-memory loading of Mach-O bundles courtesy of dyld and its NSCreateObjectFileImageFromMemory/NSLinkModule API methods. And while these methods still exist today, there is a key difference.. memory modules are now persisted to disk. So in this post we'll take a look at just what was changed in dyld, and see what we can do to restore this functionality... hopefully keeping our warez in memory for a little longer.... Read More »
For a while I've wanted to explore the concept of leveraging a virtual machine on target during an engagement. The thought of having implant logic self-contained and running under a different OS to the base seems pretty interesting. But more so, I've been curious as to just how far traditional AV and EDR can go to detect malicious activity when running from a different virtual environment. While this is a nice idea, the issues with creating this type of malware are obvious, with increased comple...... Read More »
If you've never heard of MACL on MacOS, you're not alone. This obscure feature is a hidden part of MacOS that underpins Apple's concept of User-Intent, a shift in focus for MacOS privacy controls in an attempt to stop endless prompts interrupting the user. And by now we all understand just how annoying these alerts can be to us attackers. Being able to operate on an endpoint without giving the game away is of course essential, and unfortunately staying under the radar on MacOS is getting toughe... Read More »
In this post, we are going to take a look at a couple of interesting methods of leveraging third-party technologies to achieve our code injection goals. For us, this translates to running code in the context of a target application without having to resort to disabling SIP.... Read More »