Understanding Ransomware Encryption

Ransomware is malware that locks your computer and mobile devices access and files by encryption of your electronic files. When this happens, you can’t get to the data unless you pay a ransom. Your computer is no longer ‘yours’ but under control of the attacker.

First of all, I wish to express the need of very good safety tools if you value your data! Always use top antivirus applications which include anti-ransomware protection. Next always have your data back-upped ! Not in the same network environment as this is all under control of your attacker.  Use external facilities like Acronis or Sophos and others. People always think others get attacked but not themselves. My advice is to invest in your companies data safety and don’t aim for cheap solutions.

Now the question about encryption and decryption: Understanding Ransomware Encryption !

HOW DID YOU GET INFECTED                                               

One of the most common delivery systems is
phishing spam — attachments that come to the victim in an email, masquerading as a file they should trust. Once they’re downloaded and opened, they can take over the victim’s computer, especially if they have built-in social engineering tools that trick users into allowing administrative access. Some other, more aggressive forms of ransomware, like NotPetya, exploit security holes to infect computers without needing to trick users.


Create bootable Big Sur installer

At some point you may wish to perform a full clean install of your macOS, which maybe Big Sur or an older system version like Catalina.
For most people a handy utility like DiskMaker X is an useful option, however not working anymore and never will be for Big Sur.

Apple increased security levels in Big Sur which makes it harder or impossible for third party software to enter parts of the system. Below a manual creation is described in order to create a bootable Big Sur installer:

Download macOS
  • Download: macOS Big SurmacOS CatalinamacOS Mojave, or macOS High Sierra 
    These download to your Applications folder as an app named Install macOS [version name]. If the installer opens after downloading, quit it without continuing installation. To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
  • Download: OS X El Capitan
    This downloads as a disk image named InstallMacOSX.dmg. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.



Apple’s new iMac 2021

The iMac, being my favourite computer, now after years Apple introduced an all-new iMac 2021 featuring a much more compact and remarkably thin design, made possible by using the new M1 chip. The new iMac design is just 11.5 mm thin, also losing the bulge in the middle which was needed to house cooling for the old Intel processor. While now featuring an even thickness, it is not having the true minimalistic edges on 2020 and earlier models. The stand is less pronounced in appearance and does not integrate in the housing as earlier 2020 model. The new iMac will be available in vibrant colors to match a user’s personal style. The new 2021 iMac, features a 24-inch 4.5K Retina display with 11.3 million pixels, 500 nits of brightness, and over a billion colors, delivering a great viewing experience.

2020 iMac model2021 iMac model
27-inch (diagonal) 5K Retina display24-inch (diagonal) 4.5K Retina display
5120‑by‑2880 pixels4480 by 2520 pixels
500 nits brightness500 nits brightness
Wide color (P3)Wide color (P3)



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