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Twitter users exposed by phishing scam

Criminals take control of Twitter accounts

Twitter users who thought friends were directing them to a 'funny blog' on Thursday ended up experiencing something completely different: a phishing scam.

Twitter was hit by two different rounds of phishing as criminals tried to take control of user accounts and then use them as a springboard to attack others.

Here's how Thursday's attack worked: In the first Twitter phishing round, hackers created fake Twitter accounts and then started following legitimate Twitter users. Twitter notifies users when they have new followers, sending the user a link to the follower's Twitter profile page. In this case, the profile page contained a link to a phishing site. So the victim, while investigating his new follower, would end up on the fake site Tvviter(.)com (this page is not safe to visit) where he would be asked to enter his Twitter username and password.

Once the phishers obtained their victim's login credentials, they used them to launch the second round of attacks. In this round, they posted Twitter messages such as "hey check thiss out" or "Hey. there is this funny blog going around". These messages include a link to another phishing site.

Scammers are phishing social networks because they have a better chance of tricking their victims, said Rik Ferguson, a security researcher with Trend Micro who blogged about Thursday's phishing campaign. They "tend to be more successful, because they take advantage of the inherent trust that these systems are based on", he said.

Once criminals have access to these accounts they can make money by sending out spam messages via Twitter or Facebook, or they can re-use the username and password combinations to try to log into other services such as web-based email, Ferguson said.

On Thursday, security vendor AppRiver reported a new round of Facebook phishing attacks. These messages have the subject line 'Hello' and read 'Check areps(.)at'. This scam, which tries to steal Facebook usernames and login credentials, also promotes the bests(.)at domain. (These domains are also unsafe to visit.)

Another reason why Twitter spam is so effective is because Twitter users rarely know what websites they're going to visit. Because messages can't be more than 140 characters long, senders often use services like TinyURL or UR.LC to shorten their links, hiding the ultimate destination from web surfers until they arrive at the site.

Victims are often phished without realising it. Tim Pratt, a freelance writer based in San Francisco, didn't realise he'd been hacked until his Twitter account sent out one of the phishing messages and friends started contacting him.

After checking his browser history, he realised he'd visited one of the fake sites. "I couldn't believe I had that URL in my history," he said. "I'm usually the one who says, 'Don't click on some random link in Facebook.'"

He thinks he probably clicked on a link sent by a friend early Thursday morning and then logged into the fake site without even realizing it. Pratt quickly changed his password and regained control of his account. "I was more embarrassed than anything else," he said.


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