Worms:
Worm is one of the most powerful virus in the various types of virus we have. Their sole objective is to propagate or spread to other systems as quickly as possible. They do however make use of replication (propagation) techniques. In fact, their objective is to copy themselves and then infect other systems. Their infections usually take place through e-mails, computer network. They could also replicate inside the memory of a PC.

Trojan
Trojans cannot be considered viruses as such. They take their name from Greek mythology (the famous wooden horse in which Greek soldiers hid so that they could enter the city of Troy undetected and then attack it). Trojans work in a similar way. They seem to be harmless programs which get into a computer through any channel.

Logic Bombs:
These activate and damage an infected system only when one or more condition/ s are met. They are not considered viruses as such, since they do not replicate, but rather depend on the actions taken by the user (the user usually copies and/ or executes them unintentionally).

Encrypted:
Rather than a virus category, this is a technique that viruses could use. A virus could belong to another category and be also encrypted (if it uses this technique). The virus encodes or encrypts itself so that antivirus programs cannot easily detect it. In order to perform these activities, the virus de-encrypts itself and, when it is finished, encrypts itself again.

Polymorphic
These are virus that use a new technique to avoid detection by antivirus programs (they are usually the hardest viruses to find). They change with every infection they carry out. In this way, they create a large number of copies of themselves.

See more: http://www.fineyemiblog.com/2016/08/various-dangerous-virus-that-destroys.html

fineyemi:
Worms:
Worm is one of the most powerful virus in the various types of virus we have. Their sole objective is to propagate or spread to other systems as quickly as possible. They do however make use of replication (propagation) techniques. In fact, their objective is to copy themselves and then infect other systems. Their infections usually take place through e-mails, computer network. They could also replicate inside the memory of a PC.

Trojan
Trojans cannot be considered viruses as such. They take their name from Greek mythology (the famous wooden horse in which Greek soldiers hid so that they could enter the city of Troy undetected and then attack it). Trojans work in a similar way. They seem to be harmless programs which get into a computer through any channel.

Logic Bombs:
These activate and damage an infected system only when one or more condition/ s are met. They are not considered viruses as such, since they do not replicate, but rather depend on the actions taken by the user (the user usually copies and/ or executes them unintentionally).

Encrypted:
Rather than a virus category, this is a technique that viruses could use. A virus could belong to another category and be also encrypted (if it uses this technique). The virus encodes or encrypts itself so that antivirus programs cannot easily detect it. In order to perform these activities, the virus de-encrypts itself and, when it is finished, encrypts itself again.

Polymorphic
These are virus that use a new technique to avoid detection by antivirus programs (they are usually the hardest viruses to find). They change with every infection they carry out. In this way, they create a large number of copies of themselves.

See more: http://www.fineyemiblog.com/2016/08/various-dangerous-virus-that-destroys.html

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