Selected viruses, spyware, and other threats: sorted alphabetically
HLL (High Level Language) viruses are written in higher languages, most of all in C, sometimes in Pascal, and rarely also in Basic. As this is not an assembler, length of these viruses is typically several times higher and they have a limited repertory of methods used at infecting files. These viruses are very often compressed to become less evident in the system, as more advanced virus technologies (polymorphism, stealth etc.) are usually not implemented because of insufficient flexibility, insufficient closeness to the operating system measures and used programming language. In other words, implementation like that would be too problematic and memory demanding, and as a result a virus like this would be very easily detected. Another moment limiting viruses of this type are knowledge and abilities of their authors. For that reason these viruses are mostly non-resident, satellite or overwriting viruses.
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