There is a new malware made for Mac going around again. This new bug is a varient of the Flashback virus that first showed up in Sept. 2011. This new Flashback bug tries to exploit vulnerabilities in unpatched versions of Java running on your machine, so be sure to keep your JVM (Java Virtual Machine) up to date. If Flashback finds that Java is up to date, it simply asks the user to install an applet. The applet is accompanied by a self signed certificate that says it's issued by Apple, but the certificate clearly states "This root certificate is not trusted". This Flashback varient is after your banking information, so beware. One symptom of the varient having been installed is applications like Safari and Skype will become unstable and begin crashing often.
There is a nasty bug going around on Macs again. The Devil Robber Trojan is a particularly nasty bug that can be picked up by downloading and installing pirated versions of Pixelmator from third party web sites. Pixelmator is ONLY available on the Mac App store and is perfectly safe, if you get it from there. However, there are other non-legitimate sites that offer it for download, and these are the one you have to watch out for.
The Devil Robber bug looks to steal your personal info and send it to various servers. The current iteration is grabbing your terminal history, log files and, particularly scary, your 1Password vault file. Agile Bits the maker of 1Password says that if a hacker doesn't know your password they wouldn't be able to crack the encryption. What you need to ask yourself is: How strong is your password? Mine is pretty good but it's not crazy hard.
Are you scared yet? The fact is Macs are no less vulnerable to viruses and spyware than any other computer. If you don't have it yet, get an antivirus software installed on your Mac and scan your system regularly.
Some recommended antivirus' for Mac are: Sophos AntiVirus, Intego VirusBarrier and ClamXav
You may also want to look at: Little Snitch. It will help you determine information is leaving your computer or what is trying to get into your computer.
If you are accessing iTunes on a PC beware of an iTunes Gift Card scam that is going around on Black Friday (Nov. 25th, 2011). The scam comes as an e-mail with the subject of "iTunes Gift Certificate" and offers a free $50.00 iTune gift card to unsuspecting PC users. The catch is that users will have to download a .zip attachment to get the certificate. The download is actually the: BredoZp-B malware. I have not heard what the virus does to the system, but it's never a good thing. You can find out more about it here. Be cautious this holiday season. If it sounds too good to be true, it probably is. This malware effects Windows PC only, so if you are using a Mac, this doesn't apply to you. But, that doesn't mean that Mac users shouldn't be using anti-virus software! Protect your Mac now, before it becomes a problem.