One of my favorite blog posts from last year was the Adversary Tricks and Treats post from CrowdStrike. They showed how one of the actors they track changed their tactics to cope with a more alert defender.
This actor, DEEP PANDA, sometimes injects a Golden Ticket onto their local Kerberos tray. To move laterally, this actor uses this trust to enable the RDP sticky keys backdoor on target systems. The actor then RDPs to the target and uses this backdoor to get a SYSTEM level command shell. Nothing to it.
When I read about interesting tradecraft, I like to reproduce it in a lab. According to CrowdStrike, this actor uses wmic to pass the Golden Ticket and execute their commands on the target systems.
I stood up a test system and used kerberos_ticket_use in Beacon to ingest a Golden Ticket. I then tried to execute a command on a Windows 8 system with WMIC:
wmic /node:172.16.48.83 process call create “stuff I want to run”
This command failed with an access denied. Picture a Sad DEEP PANDA face here. After some digging, I found that there’s a flag I need to specify. To pass a Kerberos ticket with WMIC, use /authority:”kerberos:DOMAIN\TARGET” on your WMIC command line. So in this case:
wmic /authority:”kerberos:CORP\WIN8WORKSTATION” /node:172.16.48.83 process call create “stuff”
That’s how you pass a Golden Ticket with WMIC.
— edskoudis (@edskoudis) November 14, 2014