Malware when oracle connection attempt

I tried to act as a malicious user on my own database on my PC just for the sake of experiment.  I tried the following steps:
I am connected to the database with the help of scott as sysdba user.  Then I gave the default password of the user scott, whose "Tiger."  Then
surprisingly, I was able to connect as user SYS.  I'm now having the user SYS privileges.  I can be destroyed the entire base.

The question is why I was able to connect as user SYS by using the username 'scott as sysdba' with scott password 'tiger '?   How
to prevent such a thing for safety?

Thank you in advance!

Respect,
Mussa.

Mussa wrote:

I tried to act as a malicious user on my own database on my PC just for the sake of experiment.  I tried the following steps:
I am connected to the database with the help of scott as sysdba user.  Then I gave the default password of the user scott, whose "Tiger."  Then
surprisingly, I was able to connect as user SYS.  I'm now having the user SYS privileges.  I can be destroyed the entire base.

The question is why I was able to connect as user SYS by using the username 'scott as sysdba' with scott password 'tiger '?   How
to prevent such a thing for safety?

Thank you in advance!

Respect,
Mussa.

Authentication of the OS allowed you to log

you might have used any string as name user and/or any string as the password

> How to prevent such a thing for safety?

do NOT allow people to connect to the DB server itself

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