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How Secure Boot works on M1 series Macs
πŸ—£tnavda

Thanks for this! I’d been scratching my head over some of those log entries, and it makes sense that as iBoot spins things up, xnu and friends are taking over their delegated tasks, but iBoot is still managing overall security.

Also interesting that things start from a single efficiency core and expand out, so late in the boot process.

This means that if someone’s looking to mess with the process, vulnerabilities in loading the second efficiency core are prime real estate.
πŸ‘€Em_Adespoton


πŸŽ–@malwr
A bunch of updates to REMnux today (see 🧡 for details). Run "remnux upgrade" to get them.
πŸ—£REMnux


πŸŽ–@malwr
Process injection via the KernelCallBackTable involves replacing original callback function by custom payload so that whenever the function is invoked, payload will be triggered. In this case the fnCOPYDATA callback function has been used.
C# code snippet: https://gist.github.com/sbasu7241/5dd8c278762c6305b4b2009d44d60c13
πŸ—£SoumyadeepBas12


πŸŽ–@malwr
πŸŽ–@malwr
For the new year I started a new blog post series on HyperGuard: PatchGuard’s lesser-known sibling:
https://windows-internals.com/hyperguard-secure-kernel-patch-guard-part-1-skpg-initialization/
πŸ—£yarden_shafir


πŸŽ–@malwr
Happy New Year! 🎊🎈 πŸŽ‰
Happy New Bug! πŸ›πŸœπŸž
https://bugs.chromium.org/p/project-zero/issues/detail?id=2223

https://bugs.chromium.org/p/project-zero/issues/detail?id=2235
πŸ—£natashenka


πŸŽ–@malwr
I published a new blog post on β€œAutomated RE of Kernel Configurations”:

This also includes the release of a new BN plugin (link in blog post).
https://zznop.com/2022/01/02/automated-re-of-kernel-build-configs/
πŸ—£zznop_


πŸŽ–@malwr
Automated RE of Kernel Configurations
πŸ—£zznop_

Pretty nice but seems to be somewhat manual process. I think somewhere on Twitter(?) I saw an idea of bruteforcing/bisecting the kconfig by building multiple variations of the kernel with different kconfig settings and comparing it against the image you have.
πŸ‘€igor_sk


πŸŽ–@malwr
WHAT?! πŸ˜‚
If you provide /FS:FILESYSTEM parameter to the format[.]com utility, the resulting process will try to load ("U"+FILESYSTEM).DLL using the default search path...
The weirdest custom DLL launcher I have meet so far :D
πŸ—£0gtweet


πŸŽ–@malwr