The three major types of malicious activities that organizations and information systems face include:
Hostile or malicious insider activity.
Theft of private, proprietary, or sensitive data, by insiders or external attackers.
Large scale DoS (denial-of-service) attacks.
Based on your research:
Describe a present-day example of your selected type of malicious activity and its impact on the organization.
Specify the countermeasures the organization took to address the malicious activity.
Recommend at least one additional preventative countermeasure and at least one countermeasure organizations could take to address this type of activity once it has occurred.