There are several things that are considered fatal for the life of computer users. System crashes, freezes, saving data every few seconds in anticipation of turning off the computer – it’s not so bad, but there are still viruses.
There are thousands of different types of viruses of various types, old and new, dangerous and not very much, but they all have one goal – to poison your life. You must be a definite manifestation of evil to release in the outside world something like this Trojan virus, while knowing that it infects the computers of millions of ordinary users, innocent people and will deal some damage. Cyber-terrorists do not need bombs, do not need weapons, they are not looking for ordinary cruelty and death, but the destruction that they can cause almost equivalent to traditional damage from terrorists.
Viruses are not only dangerous and destructive, but also secretive, and have a wide range of methods that used to hide from detection by antivirus software. For example, some of them are able to infect files, while not increasing their size or injuring themselves. These viruses are called “hollow” viruses, because they achieve their goal by overwriting the files of applications in the unused area. Other viruses block the tasks which anti-virus has to perform by scanning system. With continued growth, development and complexity of computer technologies and operating systems, there is needed to improve the system stealth virus.
File-bait – this is a file specifically created for infection it with a virus. There are various reasons for its use. These files can be used to remove the ‘fingerprint’ of the virus. Storage and distribution of small, infected file is more practical than sending large infected program. Files-baits can also be used to study the behavior of viruses and evaluation of methods for their detection. This may be particularly useful if the virus turns polymorphic, and will infect a large number of decoy files, which can be used to test the effectiveness of anti-virus scanner. Some software uses these files, and if they are modified, the software warns the user that the system has an active virus.
Viruses are designed in such a way in order not to fall into the category of suspicious programs, especially small software files that have elements of “garbage”. Another strategy of avoiding detection, complicating the method of working with files baits is a chosen contamination. This method involves no initiation of a file that would be an ideal host in other cases. For example, there is a random process, which determines whether to infect a particular file, as well as a process that defines in which certain days of the week should infect files.
Another way of deception antivirus – is an intercept and intervenes in the records of the operating system on reading files. The report goes through the virus, which returns the system of non-infected files, which seems “clean”. Booting from a storage medium that you feel absolutely clean is one sure way of avoiding this deception.
Advanced method of stealth virus is quite simple in theory. It is in the use of encryption of the virus, which, in turn, consists of a descramble module and an encrypted copy of the virus. There may be different keys for each infected file, so one always remains descramble module of the virus. Scanning the system does not detect the virus using signatures, but could find descramble module – this method of detection is incorrect. Found file may be marked as suspicious.
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