rkhunter

bagi pengguna ubuntu untuk deface gunakan : apt-get install rkhunter
rootkit, backdoor, sniffer and exploit scanner
Rootkit Hunter scans systems for known and unknown rootkits,
backdoors, sniffers and exploits.
It checks for:
– MD5 hash changes;
– files commonly created by rootkits;
– executables with anomalous file permissions;
– suspicious strings in kernel modules;
– hidden files in system directories;
and can optionally scan within files.
Using rkhunter alone does not guarantee that a system is not
compromised. Running additional tests, such as chkrootkit, is
recommended.