Rootkit removal strategy: ways to handle potentially infected endpoints. Unlike standard malware, rootkits operate at deeper system levels, allowing attackers to hide activity. Rootkit incidents are not just about removal. They are about restoring system integrity and ensuring the endpoint can be trusted again. In this video, we'll outline a structured evidence-driven approach to detecting, containing, and remediating rootkit infections. Before we begin, be sure to subscribe to NinjaOne's IT Video Hub and our YouTube channel for more tech content like this. Five rootkit removal strategies. Contain the endpoint and preserve evidence. Immediate containment is critical to prevent lateral movement and data loss. Disconnect the endpoint from all network access and revoke active user and computer account sessions. Before taking destructive actions such as rebooting or re-imaging, capture volatile data. This includes running processes, open network connections, scheduled tasks, and startup behavior. These artifacts help determine how the rootkit operated. At the same time, collect indicators of compromise such as unsigned drivers, suspicious services, and modified boot records. Preserving this data ensures accurate investigation and reporting. Validate the infection using trusted methods. Rootkits can manipulate system outputs, so validation must occur outside the infected environment. Boot the system using trusted recovery media and run offline scans to avoid interference. Verify boot integrity by checking secure boot status, driver signatures, and boot records such as the MBR or GPT. Memory capture analysis can also reveal hidden activity, such as injected code or kernel hooks. If firmware compromise is suspected, use vendor tools to validate BIOS or UEFI integrity and determine whether re-flashing is required. Decide whether to clean or rebuild. Recovery decisions should be based on the level of compromise. If the issue is limited to user-level activity, controlled cleanup may be sufficient, but only after thorough validation. If the rootkit affects the kernel, boot process, or firmware, a full rebuild is required. This includes reinstalling the operating system from trusted installation media and, if necessary, re-flashing firmware or replacing hardware. After rebuilding, apply patches, enforce disk encryption, and restore data only from verified clean backups. Secure the environment and prevent recurrence. Rootkits often indicate broader compromise. Credentials associated with the affected system should be rotated to prevent unauthorized access. Administrative tools such as RMM platforms, PowerShell, and remote access utilities should be reviewed for misuse and hardened with stronger authentication and access controls. Monitoring adjacent systems for similar indicators helps identify potential spread within the environment. Document the incident for audit and improvement. Thorough documentation ensures accountability and supports future improvements. Record collected evidence, timelines, and key decisions for each incident. Track exceptions with defined ownership and expiry dates to prevent gaps in security posture. Insights from the incident should be used to update standard operating procedures and strengthen defenses over time. By focusing on restoring trust in the endpoint and securing the broader environment, MSPs can reduce long-term risk and maintain client confidence. A consistent, well-documented process ensures that even the most advanced threats are handled with precision and accountability. For more information, check out our official blog post on rootkit removal strategies linked in the description below.