Trend Micro has warned of malware that poses as Java Update 11, created by an unknown publisher. According to Trend Micro, the fake update in question is javaupdate21.jar and it downloads and executes malicious files.

"Once executed, this backdoor connects to a remote server that enables a possible attacker to take control of the infected system," Paul Pajares, a fraud analyst at Trend Micro, wrote in the company's Security Intelligence Blog.

"Though the dropped malware does not exploit CVE-2012-3174 or any Java-related vulnerability, the bad guys behind this threat are clearly piggybacking on the Java zero-day incident and users' fears. The use of fake software updates is an old social engineering tactic."

Not a New Trick

Pajares noted that this is not the first time that cybercriminals took advantage of software updates. Last year, we reported about malware disguised as Yahoo Messenger, which Trend Micro found in time for Yahoo's announcement of its update for Messenger.

"During our analysis, this ransomware locks users' screen and attempts to access specific sites to display its notification to users," Pajares said. "However, the malware we analyzed failed to download the said notification, thus the user is possibly left with a blank page."

Richard S. Westmoreland, Level III security analyst and team leader at Perimeter E-Security, told us social engineering is still the most successful way of breaching systems.

"Updates, patches and hot-fixes should always come directly from the vendor," Westmoreland said. "Companies should remind their employees to wait for instructions from their management and IT administrators and not try to 'solve' their own computer problems in ways that have not already been authorized."

Malware Is Big Business

Alex Horan of CORE Security said that if you ever wanted proof that malware is an active business, look how quickly the malware providers respond to events.

"They leverage trending events -- like Hurricane Sandy, relief drives, elections -- to increase the likelihood of a victim interacting with their malware and exposing themselves to risk," Horan told us.

"'Trust but verify' should be the maxim for dealing with any messages or requests you receive. Even if it makes perfect sense for the IT department to be warning you of the Java exploit and sending you a link to download the patch, you should still call and verify it is truly an e-mail from them and not from an attacker."

Paul:

Spade: