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                                                                   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