The bug in the Internet Explorer browser was discovered by anti-spyware firm Sunbelt Software on 21 September.

BBC: NEWS | Technology | Browser bug could get early patch

On the blog of security firm Sunbelt Software, researcher Christopher Boyd highlighted Tuesday a new wave of spam messages flooding into the microblogging service.

FORBES: "Marvelous," "Incredible," "Revolutionary" Spam Aims To Infect Twitterers

Over several days last week, Google removed thousands of pages from its search results that security software maker Sunbelt Software discovered were secretly infecting users with hidden malicious programs.

FORBES: Magazine Article

In November, security firm Sunbelt Software found that hundreds of ads placed on Web sites by DoubleClick, the largest ad-serving platform on the Web, linked to pages designed to install malware on users' desktops.

FORBES: Future Phishing

Over several days last week, Google (nasdaq: GOOG - news - people ) removed thousands of pages from its search results that security software maker Sunbelt Software discovered were secretly infecting users with hidden malicious programs.

FORBES: Google's War On Cyber-Crime