1 EXHIBIT 23(C) CONSENT OF INDEPENDENT AUDITORS The Board of Directors Walden Bancorp, Inc.: We consent to use of our report dated January 23, 1996 incorporated herein by reference, relating to the December 31, 1994 consolidated financial statements of The Co-operative Bank of Concord and subsidiaries and the reference to our firm under the heading "Experts" in the prospectus which is a part of the Registration Statement on Form S-4 for UST Corp. /S/ KPMG PEAT MARWICK LLP ------------------------- KPMG PEAT MARWICK LLP Boston, Massachusetts October 30, 1996