Dr Web, a Russian antivirus software specialist, has discovered a new piece of malware that targets computers running Mac OS X and Linux. Named “Wirenet.1,” once installed the software steals all of the passwords you enter into your web browser, mail client, and other apps, and has the ability to log your keystrokes.

Apple has issued a second update to Java in just two days this week as the company works to patch vulnerabilities that have led to the infection of over 600,000 Macs. The Java for OS 2012-002 update is now available to download via Software Update, and it’s recommended that you update.

A Mac infected by a virus used to be something of a rarity, and it was the best argument you could bring to a Mac versus PC debate. But with Mac adoption surging in recent years, it was inevitable that Apple’s operating system would become a target for hackers.

Variations of one Flashback trojan, which first surfaced back in 2007, are now affecting more than 600,000 Macs around the world. Here’s how to find out whether your machine’s affected and kill the malware.