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Every business no matter what size is prone to the same vulnerabilities when it comes to data : external threats such as software viruses or internal threats like floods and fires or hardware failure . For species with a low sequence similarity and a high degree of gene rearrangement such as RNA viruses , reliable multiple sequence alignments are very difficult if not impossible to obtain . More recently , many spammers are now adopting computer hacker techniques , such as computer viruses to hijack innocent consumer 's computers and use them to send spam untraceably . The largest threat today is from what is known as macro viruses , which attach themselves to the macros in Microsoft Word and Excel documents . Malware , which is a generic term used to describe any program or file that is harmful to a computer , includes threats such as computer viruses , worms and Trojans .