My enterprise recently suffered a server breach and we're now trying to clean up. I've noticed more traffic than...
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usual coming from the server and have heard about hackers leaving behind tools called "booter shells" after attacks to be used for future DDoS attacks. How can I tell if booter shells are infecting this server? How can I clean them off if they're on the server?
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Depending on the details of a breach, the risk involved with trying to clean-up a compromised server is very high as remnants from the breach can still remain, including the aforementioned booter shells, rootkits, malicious cron jobs, start-up scripts, compromised files, etc. Often, desktop systems are cleaned rather than rebuilt due to a fear of overwhelming desktop support with the task of rebuilding workstations. Server administrators share the same concerns. They might try to clean all traces of an attack from a server, but the consequences of not cleaning a server fully might be more significant than not cleaning a desktop.
If a file integrity monitor like Tripwire or OSSEC was being used prior to an incident, a system admin can discern which files were modified during the incident. This could allow the admin to be able to effectively clean a server using the data from the file integrity monitor. Booter shells can also be detected by monitoring network traffic for a high volume of traffic to a specific site. If booter shells and other remnants of an attack aren't fully cleaned from a server, it could still be used to attack other systems on the local network or Internet. Fully cleaning and securing a compromised server is vital to an organization's future security.
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