Most common are so-called phishing attacks, attempts to trick users into divulging their personal details such as passwords or payment information.
The compromised data in these forums tends to come from phishing attacks--those spammy e-mails asking you to send along your financial data--and from malware.
Phishing attacks involve messages that look like they come from a bank or other organisation and direct people to a website that mimics the real thing.
Early this year, Twitter experienced several phishing attacks in which a Web page that looked identical to the widely recognized light blue Twitter page was a hoax.
Phishing attacks were mainly gunning for Facebook accounts, and then used those accounts to send emails with malicious links to friends of the hacked Facebook page.
Companies frequently face data breaches when employees lose laptops and disks, but sharing and storing company documents on third-party cloud services carry their own risks, including phishing attacks.
Tumblr told its customers to review any e-mail conversations they had with Zendesk to make sure there was no account information that could be used in phishing attacks.
The company began as a pet project in June 2005, when a few CMU engineering professors, Sadeh, Hong and Lorrie Cranor, were focused on how to decrease the effectiveness of phishing attacks.
On top of never having to remember a password again, Pico users would be theoretically immune from phishing attacks, choosing weak passwords, or even having their password stolen by an over-the-shoulder snoop.
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Most online banks and many other net companies have been subject to phishing attacks which try to trick users into handing over login and account details using carefully crafted messages that look legitimate.
The US Computer Emergency Readiness Team (US-CERT) has told computer users to be wary of potential e-mail scams, as well as fake anti-virus and phishing attacks regarding the Japan earthquake and the tsunami disasters.
Moreover, the largest number of email antivirus detections in 2012 was recorded in the U.S. (12.5 percent), and the U.S. was the top target for phishing attacks (32 percent), Kaspersky Lab reported on Monday in Moscow.
Available as a physical device or as a free app for iOS or Android devices, it offers players an added level of security against account-theft attempts that stem from sources such as phishing attacks, viruses packaged with seemingly harmless file downloads, and websites embedded with malicious code.
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The student loan system is facing sustained "phishing" attacks, with 1, 400 websites shut down this year.
Spam, phishing and website attacks are often run through these botnets.
Hemanshu Nigam, first chief security officer for MySpace, said the firm warns about suspicious links and educates users about the harm phishing and malware attacks can bring.
Cybercriminals are employing phishing and malware attacks for a number of reasons, including trying to redirect users to sites where profit is fueled by the number of visitors.
Many of the state-backed attacks used phishing campaigns to try to get a foothold in a target company.
Bredolab began operating in 2009 and Mr Avanesov used a variety of techniques, including automated attacks and phishing messages, to expand it.
Over the past two years it said it had detected 26 phishing and 50 malicious software attacks which were not automatically blocked.
Hi-tech criminals use botnets to send out spam, phishing e-mails and launch attacks on websites.
Now the biggest threats include "phishing" schemes and "botnet" attacks.
Many highly publicized attacks have been based on a tactic called "spear-phishing, " where email users are tricked into opening a legitimate-sounding message that contains code called malware that lets attackers penetrate corporate networks.
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