[oracle@ora12c ~]$ sqlplus sys@oracdb as sysdba

SQL*Plus: Release 12.1.0.2.0 Production on Tue Jan 24 13:37:49 2017

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Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Advanced Analytics
and Real Application Testing options

SQL> password
Changing password for SYS
Old password:
New password:
Retype new password:
Password changed

SQL> select profile from dba_users where username='SYS';

PROFILE
--------------------------------------------------------------------------------
DEFAULT