Root out rootkits
Sophisticated software can help you keep an eye out for malware, but by the time it's spotted, it's probably too late, costing you the time to repair and rebuild your system, as well as a loss of revenue if it's a production system. Chkrootkit is a proven, mature, and highly sophisticated tool that helps you detect a variety of malware in an ongoing process.
A True Story
A year or two after the turn of the millennium, I lost a server through the disastrous compromise of a popular web-based application. Thankfully, although the server was in use, there were no services on it that couldn't wait a few days before being restored.
The first clue that something was wrong was some strange filesystem behavior while logged in over SSH. I checked the Apache error logs, and – lo and behold – I found some output detailing a wget transaction. The wget file transfer was showing an illegitimate download from a nasty-looking URL.
[...]
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