My Adwords account was hijacked. My password was probably harvested somewhere.
Google is in process of issuing credit or refund. $x,#*$! involved.
It sounds like Google will not tell me what really happened. I would need to subpoena to get details. I don't know if they will prosecute or not.
My advice is to use a strong password - and change it frequently.
An old campaign was turned on. It had been paused. A new ad group was created with keywords relating to "i phones". Traffic went to a site with a few simple links, and then traffic was encouraged to move on to a shopping cart site.
The daily budget went from $0 to $200 to $600 to $900, or something like that.
The dates of account changes was something like 3/24, then 3/26, then 3/28.
Google notified me at that time that the account had suspicious activity and would be suspended.
It won't be turned on for another week. LOST SALES on my ecommerce site.
Google does not suggest that I create a new account with new campaigns - as I will lose history and the quality ratings of my ads would change.
If anyone has any advice as to what I can/should do now, please post. At this point, I've changed passwords, run antivirus and malware programs. Nothing found.
Changes were made in mass, so Adwords Editor might have been used.
My advice - have very good passwords and change them frequently.