Awesome

The Sea Watcher

Implementation of The Watcher, a SMM rootkit:

• https://www.mitre.org/sites/default/files/publications/14-2221-extreme-escalation-presentation.pdf (slides 57 to 63)
• https://scumjr.github.io/2016/01/10/from-smm-to-userland-in-a-few-bytes/

This is a (dirty) proof-of-concept.

Files

• hijack_vdso.c: SMM payload hijacking VDSO
• payload.s: shellcode written to VDSO by hijack_vdso.c
• seabios/: SMM backdoor, applied against SeaBIOS
• shellcode.rb: metasm script to compile hijack_vdso.c
• smm-trigger-local.c: trigger the execution of the SMM payload from a local account
• smm-trigger-remote.py: trigger the execution of the SMM payload from the network
• trigger_smi.c
• vdso-test/: stuff to test VDSO shellcodes