Answer: Attempt to quarantine all infected hosts to limit further spread.

As soon as the malware was identified, the incident response begins. The steps for incident response are:
1. Preparation - Preparing for an attack and how to respond
2. Identification - Identifying the threat
3. Containment - Containing the threat
4. Eradication - Removing the threat
5. Recovery - Recovering affected systems
6. Lessons Learned - Evaluating the incident response, see where there can be improvements for a future incident.