In your opinion what are the biggest threats to a network in terms of security and why? Solution Blackhole exploit kit — The United States was again in the top position for the Blackhole exploit kit as the attacker and tied with Indonesia for the most victims. Crimeware tools, such as the Blackhole exploit kit, introduced major upgrades this quarter. Botnet control servers and victims — This is the only threat where the top spot was not held by the United States. Venezuela was the top target and the United States was number two. However, the United States retained first place among newly discovered botnet command servers. PDF exploits — The United States was also the clear leader among countries hosting the most PDF exploits as detected by our network technologies — no other country even came close. SQL-injection attacks — The United States took the top spots as both attacker and target in the third quarter of 2012..