October 31 (SeeNews) - Standard & Poor's said on Friday it had lowered its long- and short-term counterparty credit ratings on Bulgaria's UniCredit Bulbank to 'BBB/A-3' from 'BBB+/A-2' and cut short-term counterparty credit rating on United Bulgarian Bank (UBB) to 'A-3' from 'A-2' and affirmed its 'BBB' long-term counterparty credit rating.