Hi Ravi,
For sap*, password is pass (small letters, not capital latter).
before logging in via sap*, make sure you have below profile parameter active:
login/no_automatic_user_sapstar = 0
(default value is 1)
If you don't have this parameter set, set it via rz10 and take a restart of system.
sap* should work after that and if still not working, rename it from database level.
for oracle you can use below command from sql prompt:
update sapsr3.usr02 set bname='SAP*.OLD' where bname='SAP*' and mandt=800;
after this command, try login with sap* using password as pass
If you have parameter set and renamed old sap*, it must work as sap* is a hardcoded user and as you try to login after renaming from DB level, it will create again with password pass
Regards,
Abhi