Government Shutdown? Obamacare? Here Come The Spammers

Symantec said it has detected a barrage of spam messages flowing through its network of customers, including a campaign that attempts to get people to visit a site promising good deals on cars and trucks for each day of the government shutdown.

In a blog post about the spam campaigns, Symantec said fairly common techniques are being used to try to dupe antispam filters.

[Related: Dirty Dozen: Top 12 Spam Countries Identified ]

Security firm Trend Micro also warned this week that it detected Obamacare spam leading users to phony Web pages and survey scam sites. The attackers attempted to get a head start, sending spam messages beginning in early September, wrote Merianne Polintan, a Trend Micro antispam engineer.

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"Some of these spam variants can be easily recognized," Polintan wrote. "However, others appear professional enough to fool some users into opening the email and clicking the links in these messages."

Spam campaigns use popular names and high-profile events to lure victims to sham websites, experts say. The majority of sites are survey scams, which trick users into giving up personal information with the hope that they can win a prize, Polintan said. "The bad guys can either sell these to other cybercriminals or be used in other, more menacing threats," she wrote.

Spammers have been trying to improve their methods, using Google to whitewash links in an attempt to evade detection over the past year, according to research in March by security appliance maker Barracuda Networks. Spammers also use poorly maintained URL shorteners in their messages and use multiple redirects to dupe antispam engines, the firm said.

Spam is a big business, earning cybercriminals millions and experts say that is why they work hard to keep spam campaigns active, constantly churning out billions of messages to users. The oldest, most notorious spam botnet, called Cutwail, got a refresh in recent months to spread malware and communicate more effectively with the fraudsters. It has been in existence since the early 2000s.