Ferguson saw the Hammers twice take the lead in the match before a controversial Robin van Persie equaliser secured the Premier League leaders a share of the spoils.
West Ham had led the game twice courtesy of goals from Ricardo Vaz Te and Mohamed Diame.
Antonio Valencia had once levelled for United before van Persie's goal 17 minutes from time.
The Dutchman reacted quickest to the loose ball after Shinji Kagawa's effort had hit the post but he appeared offside, although assistant referee Harry Lennard failed to raise his flag.
Ferguson, whose side now need four points to be assured of a 20th league crown, felt his side deserved the result.
"We had to stand up to a lot, we went down twice but we kept going. We played like champions," he told Sky Sports.
"It was magnificent in terms of determination and courage to play. It's one more game away - we're determined to win, we don't like losing and they showed that again."