SAN FRANCISCO — In a backhanded compliment to Apple Inc., online criminals are apparently so impressed with its scorching sales they are sending Macintosh computers an attack typically aimed at machines running Microsoft Corp.'s dominant Windows operating system. Symantec Corp. researchers said the Web sites serving up the new attack also deploy a Windows version. "For a while Mac users have enjoyed the benefits of being a small enough population that hackers didn't go after them directly _ that's obviously now changing," said Ben Greenbaum, senior research manager at Symantec Security Response. Lynn Fox, an Apple spokeswoman, said the Cupertino-based...