An organization has recently adjusted its security stance in response to online threats made by...

In the context of NIST SP800-61, a precursor is an event that indicates the potential occurrence of an incident. When an organization adjusts its security stance in response to online threats made by a known hacktivist group, the initial event—the threats—would be considered a precursor. It is an indication of a potential future attack or security incident34.

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NIST SP 800-61 Rev. 2, Computer Security Incident Handling Guide3.

Computer Security Incident Handling Guide - NIST