![]() Power down devices if you are unable to disconnect them from the network to avoid further spread of the ransomware infection. Not doing so could cause actors to move laterally to preserve their access or deploy ransomware widely prior to networks being taken offline. Isolate systems in a coordinated manner and use out-of-band communication methods such as phone calls to avoid tipping off actors that they have been discovered and that mitigation actions are being undertaken. After an initial compromise, malicious actors may monitor your organization’s activity or communications to understand if their actions have been detected.For cloud resources, take a snapshot of volumes to get a point in time copy for reviewing later for forensic investigation.If taking the network temporarily offline is not immediately possible, locate the network cable (e.g., ethernet) and unplug affected devices from the network or remove them from Wi-Fi to contain the infection.Prioritize isolating critical systems that are essential to daily operations.It may not be feasible to disconnect individual systems during an incident. If several systems or subnets appear impacted, take the network offline at the switch level.Determine which systems were impacted, and immediately isolate them.Apply these practices to the greatest extent possible based on availability of organizational resources. Refer to the best practices and references below to help manage the risk posed by ransomware and support your organization’s coordinated and efficient response to a ransomware incident. Be sure to move through the first three steps in sequence. ![]() This information will take you through the response process from detection to containment and eradication. The Cybersecurity and Infrastructure Security Agency (CISA) strongly recommends responding to ransomware by using the following checklist provided in a Joint CISA, FBI, NSA, and Multi-State Information Sharing and Analysis Center (MS-ISAC) #StopRansomware Guide, updated in May 2023.
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