Southeast Asia’s answer to ride-sharing giant Uber Technologies Inc. is getting a new investment from Japan’s SoftBank and China’s Didi Chuxing.

Herbert Smith Freehills and Paul, Weiss, Rifkind, Wharton & Garrison are advising SoftBank Group Corp. and Chinese car-sharing company Didi Chuxing on a financing round that could see Didi’s Southeast Asian counterpart Grab raise as much as $2.5 billion.