Discovering and Removing a Hidden Reverse Shell on an Ubuntu Web Server
By
Faruk
Toasted to a respectable shade. No regrets, no crumbs left.
Summary
The article details the author's discovery of a hidden reverse shell running under the www-data user on their Ubuntu web server, highlighting the unusual outbound traffic that led to the discovery. It provides a step-by-step account of how the issue was identified and resolved, emphasizing the quiet persistence of such threats.
Key quotes
· 3 pulledSometimes the most dangerous threats aren’t brute-force attacks or zero-day exploits. They’re quiet, persistent footholds hiding in plain sight.
I noticed unusually high outbound traffic from the web server, even though there weren’t many visitors.
Here’s how I found it — and exactly what steps I took to clean it up.
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