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Mydoom A computer worm appeared in 2004 that infects computers running Windows. This worm spreads through e-mail messages, as it appears as a message titled “Error sending e-mail.” (“Error”, “Mail Delivery System”, “Test”, “Mail Transaction Failed”…) And inside that message is the infected email attachment, which, after running, the worm sends infected emails to every email in the address book of the infected device and publishes itself within the network, thus becoming Mydoom One of the fastest spreading email worms.
ILOVEYOU Another virus (computer worm) It deserved the title of one of the worst computer viruses in history because of the losses it caused, estimated at 10 billion US dollars. It appeared in the year 2000 and originated in the Philippines. You receive the virus by e-mail via a regular message with the address ILOVEYOUIts content is one line urging you to open the attached file, which is supposed to contain a “love letter” from the sender, and of course this is only a bait to make the recipient open the attached file (virus), which is a script.
Well, what does a virus do after running it? . . . It simply copies itself into the system folders and then the registry to run every time you start the system, and then tampers with Internet Explorer (Remember we are talking about the year 2000 here) To download a Trojan, it steals passwords, and of course then modifies the registry to make the Trojan run every time the system is started. Then the Trojan performs its job, which is to steal the saved passwords on your device and send them to a specific email that belongs to the owner of the virus, who is a university student who lacks money. He created this virus so that he could steal accounts and use Internet services for free. After that, the virus sends itself to all the mailing list saved on the infected device, and finally the virus begins to tamper with the files on the device and overwrite them (create new files and delete original files).
In addition to the $10 billion in losses, it is believed that 10% of the world’s computers were infected with a virus ILOVEYOUEven if the numbers are not enough to reveal the extent of the damage caused by the virus ILOVEYOU On the ground, knowing that a number of governments and large corporations (British Parliament, Ford … etc.) Turning off their email systems to protect against the virus will suffice.
ransom virus spread WannaCry In about 150 countries infected a huge number of computers (about 230 thousand devices) And causing paralysis in many companies, hospitals, and government organizations, as well as causing huge losses estimated at 4 billion US dollars around the world.
Before WannaCry, specifically in 2013, a fierce ransomware virus known as . appeared CryptoLocker It was one of the most dangerous types of ransomware. CryptoLocker It is a Trojan horse that targets Windows devices and spreads through emails (infected attachment). When it infects your device, it encrypts your files and asks you to pay a certain ransom via Bitcoin ($400) In exchange for decrypting your files and returning them to you again, of course you have a specific deadline and deadline that you must pay before it arrives, and if the deadline expires and you do not pay, you will lose your files forever.
Sasser It is a computer worm that appeared in 2004, infects Windows operating systems, made by a 17-year-old German computer science student at the time named Sven JaschanThe cost of damage caused by the virus has been estimated Sasser With $18 billion. When a virus hits Sasser It slows down the computer and causes it to crash, and it also makes it very difficult to turn it off without cutting off the power to the device. This may seem to you a simple thing and will not have that significant impact on the ground, but the reality was exactly the opposite, with more than a million computers infected with this virus, it had a severe impact on airlines, public transportation, news agencies, companies, Hospitals, banks… and others, all of this had devastating effects on people’s real lives.
Unlike other computer worms, Sasser It was not spread via e-mail, but through a security vulnerability present in the Windows system at the time, when the virus infects your device, it searches for other weak or not immune systems from the vulnerability, then contacts them and infects them with the virus.