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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

An e-commerce company runs its web tier on an Auto Scaling group of Amazon EC2 instances in a public subnet. After detecting a web shell on several instances, the incident response team applied a WAF rule to block the attacker's IP addresses. According to NIST guidelines for long-term containment, which additional action best balances continued service availability with risk reduction?

  • Detach the VPC's internet gateway to sever all inbound and outbound traffic for every subnet.

  • Stop the entire Auto Scaling group and keep it offline until the forensic investigation is finished.

  • Replace the Auto Scaling launch template with a hardened, patched AMI and perform a rolling update that cycles out the existing instances.

  • Immediately terminate the compromised instances without replacement and issue a public outage notice.

ISC2 Systems Security Certified Practitioner (SSCP)
Incident Response and Recovery
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