Online threats


People spend a lot of time online, both privately and professionally. The online world is full of cyber threats that can harm unsecured users irretrievably. Not only financially, but also personally.

Most computer threats are malware, spyware, adware, phishing, viruses, Trojans, rootkits, ransomware, and browser hijackers. With this type of weapon, hackers can gain your passwords and credit card information, lock your computer and demand payment for regaining access, erase your private data, slow down your computer, and much more.

Cyber ​​threats came along with computers. And since then, people try to protect their computers.

  • 1986 – The first computer virus, „Brain”, was created to attack IBM computers by replacing the boot sector of a floppy disk with a copy of the virus.
  • 1988 – Avast launches its first antivirus – one of the first antivirus programs in the world. Avast currently protects over 400 million people worldwide.
  • 1998 – „Chernobyl”, the first virus to cripple computer hardware and attack BIOS (needed to boot the computer).
  • 2003 – „Cabir”, the first mobile virus designed to infect Symbian mobile devices and spread to other devices via Bluetooth.
  • 2010 – „Stuxnet”, the most advanced and the first virus that is able to manipulate hardware in real time. Its targets are mainly assembly line machines, amusement park machines and centrifuges for the separation of nuclear material.

Casino virus copies file allocation tables (FAT tables) to randomly access memory (RAM) and removes the FAT tables from the hard drive and forces the user to play roulette in order to save the files. Whether the user wins or loses, the computer will shut down and the user needs to reinstall DOS.

Walker is a mild resident virus that infects COM and EXE files when they are launched. The Walker virus checks your keystrokes and sometimes shows a moving character from Bad Street Brawler. In some cases, the virus removes itself from infected files.

Kuku overwrites and infects files, disables the keyboard and fills the screen with colorful titles that read „Kuku!” Each time an infected file is run, the virus infects an uninfected COM file in the current directory.

LSD is a dangerous non-resident parasite virus. It overwrites the files in the current directory and shows up as a graphic effect.