A Compromise Assessment is a review of the organization's systems to identify if the organisation's systems have been compromised in some way. This assessment is commonly performed after a security incident to validate that the organization is no longer at risk from the original incident.
Compromise assessments involve a technical review of the organization using specific software and scripts to gather relevant forensics information within the environment to detect past compromises or issues.
Compromise assessments validate that there is not ongoing security incident, helps identify security incident response gaps, and can be used to create business cases for additional security incident response capabilities. This can be used to provide reassurance for an organisation and also, where relevant, customers or partners.