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What saved the hospital was a combination of quick reporting by affected victims and a quick response from the security staff. As soon as the security staff discovered that there were multiple systems under attack from ransomware, they disconnected everything from the network. It was an extreme response but one that probably saved the hospital millions of dollars. Another hacking group is focused on taking advantage of known weaknesses in the JBoss Management Console. JBoss is an open source application server maintained by Red Hat.

Early versions of ransomware targeted home computer users almost exclusively. It was very rare to hear about a company being infected with ran‐ somware. Ransomware is still delivered in large numbers to home users, with hacker groups, like the group behind Locky, indiscriminately spamming people hoping to get a successful infection and even occasionally someone who will pay them. But it wasn’t long before hacker groups realized that organizations were more likely to pay ransoms to get their systems up and running again.

51 Attack Vectors for Ransomware Most modern cryptoransomware uses a few methods to gain entry into a system. Most gain access to networks by requiring user interaction through an infected file or malicious link sent via email or through malicious advertising injected into legitimate advertisement networks. The malvertising types of ransomware use JavaScript or Adobe Flash in the background while the ad downloads and runs the ransomware without any user interaction or knowledge (see Figure 4-1).

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