I advise you to visit Microsoft Malware Protection Center regularly to get updated about latest threats, security news and advice. Microsoft has put together a list of AV rogues which are detected by the company’s antivirus products, including Microsoft Security Essentials, Forefront Client Security, etc.
According to Microsoft:
Rogue security software programs typically mimic the general look and feel of legitimate security software, claiming to detect a large number of nonexistent threats and urging the user to “activate” the software to remove them. Some families emulate the appearance of the Windows Security Center or unlawfully use trademarks and icons to misrepresent themselves. Rogue security software spreads through familiar malware distribution mechanisms, like spam and exploits, and through customized tactics, like a fake Webbased security scanner. After installation, some rogue security software families take other actions to evade detection or to frighten the user into paying.
Rogue security software displays false or misleading alerts about infections or vulnerabilities on the victim’s computer and offers to fix the supposed problems for a price. It has become one of the most common methods that attackers use to steal money from victims. These are programs that mask themselves as legitimate security programs offering protection from malware, spyware, and other threats, but actually use social engineering to obtain money from victims, and offer poor or nonexistent protection.