chkrootkit - 0.58b-3 main

The chkrootkit security scanner searches for signs that the system is
infected with a 'rootkit'. Rootkits are a form of malware that seek
to exploit security flaws to grant unauthorised access to a
computer or its services, generally for malicious purposes.
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chkrootkit can identify signs of over 70 different rootkits (see the
project's website for a list).
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Please note that an automated tool like chkrootkit can never
guarantee a system is uncompromised. Nor does every report always
signify a genuine problem: human judgement and further investigation
will always be needed to assure the security of your system.