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- Apple quickly issued an update to iOS 7 and iOS 6, but took longer to issued an update for Mac OS X, despite Apple confirming that the same SSL/TSL security flaw was also present in OS X.
- Mac OS X: The First Virus. Throughout time, Windows has been known as the most virus-prone of all operating systems. Vulnerabilities in the Microsoft Windows Explorer web browser and the Windows system itself exposes this platform to a wide range of threats from viruses and worms to spyware.
- These viruses affected versions of the Mac OS all the way up to version 9. 1990: The MDEF virus, also known as Garfield, would infect applications and system files.
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Malware with self-replicating capability has been an issue in the world of computing for several years, dating back to the first self-replicating code created by Ken Thompson in 1984. Over the past few years, both worms and viruses have become major problems, mainly due to widespread use of the internet. This wide open platform enables these infections to spread rapidly with no geographic restrictions. Worms in particular are becoming more sophisticated as malicious coders have learned from their mistakes and successes as well.
In this article, we will take brief glance at the history of computer worms and how they have impacted the current state of computing.
Early Infections
Self-replicating applications date back to the early days of the Unix operating system. Ken Thompson's code was essentially a compiler modification that manipulated login procedures and the compiler itself. The conventional virus became a common plague in the era of the Apple II system. This infection moved rather slowly, yet provided the means of distributing some of the most known viruses, such as Chernobyl and Michelangelo.
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The first Internet infection that required no human intervention to propagate was the Morris Worm, discovered in 1988 and released by Robert Morris. It spread very quickly, infecting a number of vulnerable computers in a matter of hours. The Morris Worm infected various machines and also used multiple exploits including buffer overflows, debugging routines in mail components, password sniffing, and other streams of execution to improve its ability to attack other computers.
Although released on accident, the benign concept doesn't really apply to the Morris Worm, as it had a significant amount of impact because of the bug in its code. When reinfecting a computer, there remained the possibility that the new infection would be persistent, allowing other worms to run and terribly impact system performance. However, this caused the worm to be noticed instantly, and therefore, quickly contained.
Modern Worms
Active computer worms have returned to prominence in recent times. The first one to cause an eruption was Code Red. This infection proved how quickly a simple self-replicating program could spread via the internet's current infrastructure. Code Red exploited a buffer flow condition in the Microsoft IIS (Internet Information Server). It was able to propagate quickly because of the 'always on' nature of IIS and many versions of the Windows operating system. Code Red was also equipped with scanning capabilities that improved its throughput and gave it the ability to elude numerous IP address security features.
Once a system has been compromised by a worm, there is actually little that can be done to mitigate the damage aside from removing it as quickly as possible. Just as everyone should devise a continency plan in case of a fire, one should also create a strategy to elude worm exploits. While there is no perfect solution, there are many steps that can be taken to prevent damage and reduce the spread of infection. Anti-virus software and firewalls are a must these days, two powerful weapons that will keep you one step ahead of a worm outbreak. It is also critical to conduct routine backups of your data as these infections can easily corrupt or completely overwrite existing files. When it comes to the disruption of worms and other malware, it's much better to be safe than sorry.
To get the latest features and maintain the security, stability, compatibility, and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.
Learn how to upgrade to macOS Big Sur, the latest version of macOS.
Check compatibility
If a macOS installer can't be used on your Mac, the installer will let you know. For example, it might say that it's too old to be opened on this version of macOS, or that your Mac doesn't have enough free storage space for the installation.
To confirm compatibility before downloading, check the minimum requirements for macOS Catalina, Mojave, High Sierra, Sierra, El Capitan, or Yosemite. You can also find compatibility information on the product-ID page for MacBook Pro, MacBook Air, MacBook, iMac, Mac mini, or Mac Pro.
Make a backup
Before installing, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.
Download macOS
It takes time to download and install macOS, so make sure that you're plugged into AC power and have a reliable internet connection.
Safari uses these links to find the old installers in the App Store. After downloading from the App Store, the installer opens automatically.
- macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks
- macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
- macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
Safari downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It installs an app named Install [Version Name]. Open that app from your Applications folder to begin installing the operating system.
- macOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion, or Lion
- OS X El Capitan 10.11 can upgrade Yosemite, Mavericks, Mountain Lion, Lion, or Snow Leopard
- OS X Yosemite 10.10can upgrade Mavericks, Mountain Lion, Lion, or Snow Leopard
Worms Vs Birds Mac Os Download
Install macOS
Follow the onscreen instructions in the installer. It might be easiest to begin installation in the evening so that it can complete overnight, if needed.
If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs macOS and related firmware updates.
Learn more
You might also be able to use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS, or install the macOS that came with your Mac.