Help id-ing creature
sounds like a mongoose or a civet, which species is hard to guess there are several species of both in India, and they come in a variety of colors and sizes. In the mongooses the color can vary a lot even in the same species. One easy way to tell the difference is civets have cat like ears while mongoose have short rounded ears. 

But here is a picture one at least one species of each, since their body plant does not vary much even if their color and size does. 

Indian Brown Mongoose, 


Sri-Lanka Mongoose


Asian Palm Civet