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besides a set of rules, logs are created in log files. different types of logs can be created: access logs are of the form user.name logon.type (where user is the user making the connection, and type the type of logon, such as remote interactive logon, remote batch logon, or remote batch logon.)
security logs are of the form event.id (where event is an event type, such as login, logoff, logon_attempt, authentication_attempt, etc. )
event logs are additional logs that track events of a given type.
then a boolean expression written in conjunctive normal form is formed using disjunction (or) and conjunction (and). in the example, the expression is i&(i&k) and is equivalent to k, which reads \"remember the last five clicks\". this is extended in principle to any length of time. in practice, the latest used time set is very large, with only a few days, or even a single day, stored.
viruses usually infect systems either through email attachments or as attachments within less secure communication media such as disk shares, network shares, or removable flash drives. virus families can cover a wide range of targets, with some family members being targeted at mail servers or other programs responsible for managing incoming email, and other members specifically targeting files of some kind.
like worms, viruses, and other malware, a virus or worm will start by attacking a vulnerable host on the local network or the internet. the number of victims infected can range from a few to millions of computers, depending on the vulnerability of the computer being attacked, the ease of accessing the local network or the internet, the visibility of the attack, the software applications on the infected computer, and many other factors. the propagation of a virus will also depend on many of these factors, as well as virus's propagation methods.