NEW YORK ( TheStreet) -- Popular searches on the Internet Monday include "Duqu virus," a new Trojan virus discovered by computer scientists.

U,S. internet security firm

Symantec ( SYMC) said it's unknown where the virus originated, though it was found by a European-based organization. The virus, called Duqu because its files begin with a "~DQ" prefix, is related to the Stuxnet worm, which was a highly malicious virus that attacked control systems. Stuxnet is infamous for attacking Iran's nuclear program in 2010.

According to Symantec, Duqu is "similar to Stuxnet, but is designed to gather intelligence for future attacks on industrial control systems" and was written by the same authors as Stuxnet.

"McRib" is also trending as

McDonald's ( MCD) is expected to announce that it is bringing back the popular sandwich.

McDonald's reportedly plans to announce Monday that the sandwich, which isn't offered on the restaurant's usual menu, will be brought back at all U.S. locations through Nov. 14. The boneless barbecue pork sandwich, which was brought back for the first time since 1994 last November, was so popular last year that McDonald's has decided to offer it again.

The sandwich is a slightly healthier choice than the Big Mac, with 500 calories and 26 grams of fat, compared to the Big Mac's 540 calories and 29 grams of fat.

Apple's ( AAPL) iPod is another popular topic after the device turned 10 years old on Sunday.

The iPod, which transformed the way music is bought and distributed, has come a long way since its debut. The first iPod had a 5GB hard drive, a mechanical scroll wheel and a Firewire connection instead of a USB.

Apple upgraded the iPod on a yearly basis, with storage capacity options increasing every time. Over time, iPods were offered in various colors, the screen changed from black and white to color, flash memory was added, video was incorporated and touchscreen was implemented.

The chatter on Main Street (a.k.a. Google, Yahoo! and other search sites) is always of interest to investors on Wall Street. Thus, each day, TheStreet compiles the stories that are trending on the Web, and highlights the news that could make stocks move.

-- Written by Brittany Umar.
Brittany joined TV in November 2006 after completing a degree in Journalism and Media Studies at Rutgers College. Previously, Brittany interned at the local ABC affiliate in New York City WABC-TV 7 where she helped research and produce On Your Side, a popular consumer advocacy segment.