Apple blocks Yontoo Mac OS X malware in XProtect.plist update

The adware Mac OS X browser targeting Trojan tries to trick users into installing it

Following last week's discovery of the Yontoo Trojan horse that's been targeting Mac users, Apple has updated its malware and adware detections list in order to block Yontoo.

As noted by Intego, Apple updated the XProtect.plist definitions file on Friday to give Mac OS X the ability to detect Yontoo, which tries to trick Mac users into installing it by prompting users to install a browser plug-in when they visit a compromised or malicious webpage.

Apple's XProtect anti-malware system will now warn users about Yontoo if they try to install the software onto their Mac. Intego says that the detection is "very specific and potentially location-dependent."

"This extra specificity is likely there so as to catch only the surreptitious installations of this file," Intego explains.

Yontoo was initially discovered by a Russian anti-virus and security company last week. Unknowing web surfers who attempt to view video trailers are told that a necessary plug-in is missing, and that they need to install it. Once installed, the Yontoo plug-in can insert ads and other content onto web pages you surf via Safari, Chrome or Firefox. Clicking or viewing these ads can generate ad affiliate network profits for the Trojan's creators.

See also:

Mac malware: New Gatekeeper bypassing Mac OS X virus discovered

Apple releases Java update and malware removal tool following cyber attack

The Android malware problem is not hyped, researchers say

Apple's Phil Schiller makes dig at Android security on Twitter: 'Be safe out there'

Join the CSO newsletter!

Error: Please check your email address.

Tags MacFirefoxApplesecurityIntego

More about AppleIntego

Show Comments

Featured Whitepapers

Editor's Recommendations

Solution Centres

Stories by Ashleigh Allsopp

Latest Videos

  • 150x50

    CSO Webinar: The Human Factor - Your people are your biggest security weakness

    ​Speakers: David Lacey, Researcher and former CISO Royal Mail David Turner - Global Risk Management Expert Mark Guntrip - Group Manager, Email Protection, Proofpoint

    Play Video

  • 150x50

    CSO Webinar: Current ransomware defences are failing – but machine learning can drive a more proactive solution

    Speakers • Ty Miller, Director, Threat Intelligence • Mark Gregory, Leader, Network Engineering Research Group, RMIT • Jeff Lanza, Retired FBI Agent (USA) • Andy Solterbeck, VP Asia Pacific, Cylance • David Braue, CSO MC/Moderator What to expect: ​Hear from industry experts on the local and global ransomware threat landscape. Explore a new approach to dealing with ransomware using machine-learning techniques and by thinking about the problem in a fundamentally different way. Apply techniques for gathering insight into ransomware behaviour and find out what elements must go into a truly effective ransomware defence. Get a first-hand look at how ransomware actually works in practice, and how machine-learning techniques can pick up on its activities long before your employees do.

    Play Video

  • 150x50

    CSO Webinar: Get real about metadata to avoid a false sense of security

    Speakers: • Anthony Caruana – CSO MC and moderator • Ian Farquhar, Worldwide Virtual Security Team Lead, Gigamon • John Lindsay, Former CTO, iiNet • Skeeve Stevens, Futurist, Future Sumo • David Vaile - Vice chair of APF, Co-Convenor of the Cyberspace Law And Policy Community, UNSW Law Faculty This webinar covers: - A 101 on metadata - what it is and how to use it - Insight into a typical attack, what happens and what we would find when looking into the metadata - How to collect metadata, use this to detect attacks and get greater insight into how you can use this to protect your organisation - Learn how much raw data and metadata to retain and how long for - Get a reality check on how you're using your metadata and if this is enough to secure your organisation

    Play Video

  • 150x50

    CSO Webinar: How banking trojans work and how you can stop them

    CSO Webinar: How banking trojans work and how you can stop them Featuring: • John Baird, Director of Global Technology Production, Deutsche Bank • Samantha Macleod, GM Cyber Security, ME Bank • Sherrod DeGrippo, Director of Emerging Threats, Proofpoint (USA)

    Play Video

  • 150x50

    IDG Live Webinar:The right collaboration strategy will help your business take flight

    Speakers - Mike Harris, Engineering Services Manager, Jetstar - Christopher Johnson, IT Director APAC, 20th Century Fox - Brent Maxwell, Director of Information Systems, THE ICONIC - IDG MC/Moderator Anthony Caruana

    Play Video

More videos

Blog Posts