Over the years intruders used different DDoS tools affecting computer systems such as Stacheldraht 1.666 DDoS tool was discovered and widely spread on multiple compromised hosts in several organizations; <ref>[http://www.cert.org/advisories/CA-2000-01.html CA-2000-01 Denial-of-Service Developments]</ref> [[Love Letter Worm]] a malicious VBScript which was spread through emails, Windows file sharing, IRC, USENET news and through webpages affecting more than 500,000 computer systems; <ref>[http://www.cert.org/advisories/CA-2000-04.html CERT Advisory CA-2000-04 Love Letter Worm]</ref> [[T0rnkit]] was also distributed by intruders using six different versions of rootkit.<ref>[http://www.cert.org/incident_notes/IN-2000-10.html Cert Incident Note IN-2000-10]</ref> e-mail borne viruses such as [[W/32/Sircam]]<ref>[http://www.us-cert.gov/reading_room/home-network-security/#III-B-1 Home Network Security]</ref> and many other viruses and worms distributed by hackers to cripple computer networks in homes and organizations. | Over the years intruders used different DDoS tools affecting computer systems such as Stacheldraht 1.666 DDoS tool was discovered and widely spread on multiple compromised hosts in several organizations; <ref>[http://www.cert.org/advisories/CA-2000-01.html CA-2000-01 Denial-of-Service Developments]</ref> [[Love Letter Worm]] a malicious VBScript which was spread through emails, Windows file sharing, IRC, USENET news and through webpages affecting more than 500,000 computer systems; <ref>[http://www.cert.org/advisories/CA-2000-04.html CERT Advisory CA-2000-04 Love Letter Worm]</ref> [[T0rnkit]] was also distributed by intruders using six different versions of rootkit.<ref>[http://www.cert.org/incident_notes/IN-2000-10.html Cert Incident Note IN-2000-10]</ref> e-mail borne viruses such as [[W/32/Sircam]]<ref>[http://www.us-cert.gov/reading_room/home-network-security/#III-B-1 Home Network Security]</ref> and many other viruses and worms distributed by hackers to cripple computer networks in homes and organizations. |