A computer virus is a malicious bit of code secretly placed into a more extensive application, such as an Excel spreadsheet, by an evil developer. The program can duplicate, conceal, wait for a predetermined trigger, and then release its payload. The payload could be harmless, or it could be designed to do damage.
Mechanisms of Viruses
Multiple potential destinations exist for a virus after it has infected your system.
Viruses that infect the master boot record severely threaten your machine. The boot record is the first section of the operating system (which governs how your computer functions) to load when you turn on your device. Before loading all the files required to run, the computer must read this record to learn how the disk is arranged. A virus can ensure its code will be run by placing it in the boot record, which is read before the operating system is even loaded.
Executable files (those with the.exe extension) are a target for computer infections. It typically appends itself right after the program’s header, a brief block of code at the beginning of a file that describes the file’s contents. The virus ensures that it will be executed before the legitimate (but infected) software is run by inserting itself after the header.
Replication
A virus first spreads by making copies of itself and inserting them into other files. When a computer reads a software file or host, each copy replicates itself.
Camouflage
Many viruses exploit deception to evade detection by security programs. A virus can replicate in many different ways.
It could, for instance, replace the virus’s actual code with bogus, non-functional code. The virus then updates the fake code with each new copy.
In this way, the virus can hide its signature—the specific set of instructions within its code that allows it to be identified. That is to say, once the virus has multiplied, the offspring won’t be an exact reproduction of the parent.
Here’s yet more guise a virus might use.
The precise file size is always specified in each program’s file header. The program’s length will increase after the virus code is added, and this can be detected. The virus could have altered the file size information in the header to make the application file appear correct.
Verifying Events
A virus performs a conditional check for a predetermined event every time it replicates. The virus is inactive unless the precondition is met. However, the virus will release its payload if the prerequisite is completed.
Typically, a specific date will serve as the event’s trigger. The payload will be released in hundreds of computers simultaneously because the virus will have reproduced thousands of times, if not more.
The opposite is true of some viruses, which, once they have multiplied, release their payloads. Some are manual, while others have predetermined timers.
Transmitting a payload
If you’re lucky, the virus’s payload won’t do much damage—it might just be an offensive message. However, it’s more likely that the shipment will be highly devastating.
Having your files corrupted or deleted by a virus means starting from scratch with no backups. They can disable your computer by erasing the data on the hard drive that the operating system uses to locate files.
The most dangerous viruses are the ones that hide in plain sight, inserting themselves into files and then stealing passwords or making arbitrary alterations to numbers in an accounting program.
Viruses that live in memory
Some viruses can load into memory and remain dormant until the machine is powered on. Because of this, viral replication has become much more efficient.
Moreover, viruses residing in your computer’s memory might monitor for anti-virus software’s attempts to locate infected files and can return bogus information to evade detection.
Secure Software
Online viruses are a significant problem today. But because of the widespread adoption of firewalls and antivirus programs, they aren’t nearly as pervasive as they were even a few years ago. These can now successfully prevent viruses from entering your system.
Using just a little bit of common sense, you can keep yourself safe:
1 – Get virus protection software.
2-Check for the most recent virus definitions updates.
Three, exercise extreme caution when reading emails or downloading files from the internet.
See http://writingservices.eu for more information about Paul Kennedy, a freelance copywriter, article writer, and editor with three decades of experience in a wide range of fields, including advertising and website copy, corporate brochures, corporate magazines and newsletters, book writing and editing, newspaper articles, and the management of commercial magazine and copywriting teams. Email him at [email protected] or [email protected] to get in touch.
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