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Good guys are keeping an eye on large espionage and botnet campaigns that are stealing corporate secrets from government and private industry and money from peoples' bank accounts.
Spam reached its lowest level in years last quarter, but malware surpassed security firm's estimates for the year, says McAfee.
The amount of malicious software hitting Android devices in the third quarter jumped almost 37 percent, boding that 2011 will be the busiest year ever for malware.
Spam levels dropped by about one-third following the recent takedown of the Rustock spambot, according to Symantec's latest Intelligence Report.
The volume of spam fell in the third quarter at the same time that malware hit a new high, according to McAfee's third-quarter Threats Report.
Spam levels increase more than 5 percent in February over prior month, due in large part to greater activity from Grum and Rustock botnets, according to Symantec.
The Pushdo botnet is trying to evade detection by using fake SSL connections to major Web sites, researcher says.
Spam made up more than 90 percent of all e-mail last month, with networks of zombie PCs producing the vast majority of such messages, MessageLabs says.
Botnets appear to have suffered a big blow with the shutdown of Pricewert, resulting in the reduction of spam activities by 15 percent globally.
ScanSafe says the energy sector is the most exposed industry to Web-based malware, while the aviation and automotive industry is least exposed.