Symantec Corp. said it will add AT&T Corp.'s Internet service to its software products. Terms of the agreement weren't disclosed. Symantec will package AT&T's WorldNet Internet service software with its Norton and ACT software programs beginning this month. AT&T will offer a free month of Internet service to Symantec customers who join through the program. AT&T will also include a trial version of Symantec's Norton software when it distributes its WorldNet CDs. Symantec shares rose $2.88 to close at $32.88 on Nasdaq. AT&T's shares rose $2.38 to close at $47.38 on the New York Stock Exchange.