Centos – Issue with perl -MCPAN -e ‘install Module::Build’;

If I can give you any advice, it is to stop wasting your time cleaning up. Make an image of the OS for forensic stuff for later, and just reinstall the server.

Sorry, but its the only secure way to resolving yourself from being rootkitted.

Later you can check the image, for certain reasons, why it happened.

From my own personal experience, I did this, and later found an internal user which had a SSH key containing the flaw of openssl in 2008.

I hope, it clears up the things.

Note:
If you are going to image/backup the server before reinstalling, be very careful, how you do this. As @dfranke said, boot from a trusted medium to backup.

You shouldn't connect to other machines from a rooted server, as great rootkits are known to be able to spread through trusted sessions such as SSH.

That's a pretty old version of Perl (released Jan 2006). I did manage to get to work for similar versions of each component but it never passed the build tests. Besides your LD_LIBRARY_PATH (some systems use a 64-bit version) and ORACLE_HOME, I had to be careful with default character set and locale to get this to work. Be careful too of having multiple homes. In the end, I installed Oracle's Instant Client separately and defined the real instance through tnsnames.

Redoing this later with newer software was much easier on a very similar system. So, upgrade if possible or use an Instant Client for a simpler environment.