Guildies acct hacked leds to bank robbery

One of the guildies accounts was hacked a day or so ago and the hacker pretty much cleaned out the bank. One of the toons is actually on right now. There's 4 bank tabs showing a few hundred withdrawls. 1 days ago and a few just within the past 6 hours. I'm not sure if anything can be done, never had this issue before. The Guilds name is Do Not Disturb. Any help would be great.

I got an email from another guildie saying the acct was hacked and to remove all of the persons toons. My guild is made up of mostly ppl that work in the same place. Mark's(rl name) acct was hacked sometime yesterday I believe. And yes I put in an in-game ticket.

The toon that stole is (removed so GM can see name)