[Swordmaker]

That window above looks nothing like Apple's alert for updates for OS X or macOS. If you see it, force quit the app that is running it and delete the email you were in. It would be a good idea to cold restart your Mac.

[Bob434]

[[Nasty Mac malware bypasses Gatekeeper, undetectable by most antivirus apps]]

PHEW! Thank goodness I have a windows computer then

[Swordmaker]

If you get an email purporting to be from the IRS containing a ZIP file, it's a PHISHING attack containing a malicious TROJAN that can damage your Mac. DO NOT OPEN IT. It will install a file that will require you to install a bogus OS X or MacOS update that installs malware on your Mac. BEWARE! As always, this attack requires you to be industrially strength stupid by opening something you shouldn't. But this time the Mac's built in protections will not help. Apple will block it soon, but watch out in the meantime. IRS does not contact people via email! — PING!

Apple Mac Security and Malware Warning!
Ping!

The latest Apple/Mac/iOS Pings can be found by searching Keyword "ApplePingList" on FreeRepublic's Search.

If you want on or off the Mac Ping List, Freepmail me

[Buckeye McFrog]

Nasty Mac!

[Irish Eyes]

Bookmark

[al_c]

Open a .zip file attached to an email?

[The Westerner]

Thank you! Always good to be reminded of safety basics such as not opening a zipfile.

[Swordmaker]

As I said, Apple has now included the definition of this malware for their Gatekeeper built-in anti-malware and Mac users are now protected from it and any similar attacks using this Trojan.

FreeRepublic Article on the Closing of this Malware Trojan