The main features of infection include an increase in outgoing Internet traffic - usually just for individual users and corporate networks. If this is not being actively online activities (eg at night), it means that it is someone else. And most of all - a malicious purpose. If there is a firewall signal of infection may be unknown applications attempt to open an Internet connection. Numerous advertising "pop-ups" when visiting Web sites may indicate that the system has a system of advertising (Adware).
Frequent freezes or crashes the computer can also be caused by the fact of infection. However, in many cases, the cause of failure is not viral, and hardware or software. If the symptoms are similar in several (many) computers on the network, if this internal traffic increases dramatically, the reason probably lies in the distribution network of another network worm and backdoor Trojan.
Indirect signs of infection may be the fact that as the symptoms and not computer. For example, bills for phone calls or SMS-message, which actually was not. This may indicate that on your computer or mobile phone wound up "phone Trojan." If the documented cases of unauthorized access to personal bank account or credit card to use the facts, it may be a signal of the spy program, introduced in the system.
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