Your end-users saw this in the news yesterday, or will read about it today. The hackers who stole more than 36 million records from the Ashley Madison site (which makes it easy to cheat on your spouse), have now posted all the records for everyone to see. This is a bad one.
Cyber criminals are going to leverage this event in a lot of different ways: (spear-) phishing attacks, bogus websites where you can "check if your spouse is cheating on you", or ways to find out if your own extramarital affair has come out.
Any of these 36 million registered users are now a target for a multitude of social engineering attacks. People that have (had) straight or gay extramarital affairs can be made to click on links in emails that threaten to out them.
I have already seen the phishing emails that claim people can go to a website to find out if their private data has been released. This is a nightmare that will be exploited by spammers, phishers and blackmailers who are now gleefully rubbing their hands, let alone the divorce lawyers and private investigators that are pouring over the data now.
Here is one of the first real examples of AshMad extortion:
Unfortunately, your data was leaked in the recent hacking of Ashley Madison and I now have your information.
If you would like to prevent me from finding and sharing this information with your significant other send exactly 1.0000001 Bitcoins (approx. value $225 USD) to the following address:
1B8eH7HR87vbVbMzX4gk9nYyus3KnXs4Ez [link added]
Sending the wrong amount means I won't know it's you who paid.
You have 7 days from receipt of this email to send the BTC [bitcoins]. If you
need help locating a place to purchase BTC, you can start here.....
What To Do About It
I suggest that you take immediate preventive action. It only takes one second for a worried end-user (or admin) to click on a link in an email and expose the network to attackers. I recommend you send something like this to your friends, family and end-users. Feel free to edit.
"Yesterday 36 million names, addresses and phone numbers of registered users at the Ashley Madison site (which makes it easy to cheat on your spouse) were posted on the Internet. All these records are now out in the open, exposing highly sensitive personal information.
Internet criminals are going to exploit this in many ways, sending spam, phishing and possibly blackmail messages, using social engineering tactics to make people click on links or open infected attachments. Be on the lookout for threatening email messages which slip through spam filters that have anything to do with Ashley Madison, or that refer to cheating spouses and delete them immediately, in the office or at the house."