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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

While investigating a potential compromise, you review several Amazon GuardDuty findings related to a Windows-based EC2 web server. The findings highlight repeated "PowerShell-related behavior" triggered through WMI event subscriptions, unexpected outbound connections to a known command-and-control (C2) domain, and the absence of any suspicious binaries after an exhaustive anti-malware scan of the instance's EBS volume. Based on these observations, which category of malicious code most likely explains the attacker's technique?

  • A ransomware variant that replaces the master boot record (MBR) and displays ransom notes at startup

  • A kernel-mode rootkit that installs unauthorized drivers to conceal malicious processes from the OS

  • Fileless malware that operates exclusively in memory and leverages native PowerShell and WMI functionality

  • A polymorphic file-infecting virus that appends malicious code to executable files on the system volume

ISC2 Systems Security Certified Practitioner (SSCP)
Systems and Application Security
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