Cyber experts told to media that hacker managed to gain access to the sites after breaching the server they were hosted.
Affected sites are
Biotechnology Industry Research Assistance Council(birapdt.nic.in)
DRDO (rac.gov.in)
West Bengal Police (policeweb.gov.in)
Directorate of Estates of Ministry of Urban Development(gpra.nic.in)
but, hacker didn't mention anythink about stealing data.
-4Hak