⟩ Describe THREE counter-measures that an information systems manager may put in place to counter these types of security threat?
Organizational Security Policy should be in place, followed, audited, drill test.
System should clearly speak about : Identity Management, Patch Management, Backup Management, Virus, Antispyware softwares should be in place and updated regularly. For a large Information Based Organisation DMZ setup.
Secure your information infrastructure, and conduct vulnerability test.