This past week the US National Surveillance Agency (NSA) joined up with Australian Signals Directorate (ASD) to issue an information packet on how to detect and mitigate web shell malware. Web shell malware is a type of malicious code that executes arbitrary instructions on a targeted web server. It is becoming such a large growing cybersecurity problem that government agencies like the NSA and ASD released a 17-page guidance on how to approach it.