Hi Sri,
Headhunting is the best tool to reach passive candidates. It doesn't involve any major process; it depends only on your creativity and how much you can leverage it. I will provide you with some steps on how to do it:
Steps:
1. Map the targeted companies with their company numbers.
2. Try to obtain the company's extension number (domain-wise) and document those details.
Tracing through their extension can yield tremendous results, although it is quite challenging.
3. Cold Calls: Directly call the company and attempt to reach the person you are looking for.
4. Participate in walk-ins.
5. Forums/Community: Gather leads to make cold calls.
I hope this information proves helpful.