What might be the best response for Lilith when discovering an extensive Advanced Persistent Threat (APT)?

When dealing with an extensive Advanced Persistent Threat (APT), the most appropriate response is to call an incident response provider. Engaging experts who specialize in responding to such sophisticated and prolonged attacks is crucial because they possess the tools, expertise, and experience to effectively investigate, contain, and remediate the threat.

APTs are characterized by their stealthy approach, ongoing nature, and the complex techniques used by attackers to infiltrate networks and extract sensitive data over time. These scenarios often require advanced forensic analysis, strategic containment measures, and recovery processes that extend beyond typical security protocols. Incident response providers are trained in identifying the indicators of compromise, understanding the attackers' methods, and implementing solutions to mitigate further damage.

While other options may seem relevant, they do not adequately address the complexities of an APT. Public notification could lead to unnecessary panic and isn't typically advisable until a complete understanding of the incident is reached. Conducting a full system backup may not be effective if the attack is ongoing, as compromised data could be included in the backup. Isolating affected systems is a critical step, but on its own may not resolve the underlying issues; expert guidance is needed to ensure all threat vectors are addressed thoroughly.

Thus, involving an incident response provider is essential for a