The website of national space agency ISRO's commercial arm Antrix Corporation was hacked on Sunday.
Highly placed ISRO officials underplayed it and said it was anyway being modified and reconstructed at this juncture when the mischief happened.
"There is no need for concern," they said, without wishing to be named.
They did not also name the misdeed as hacking.
One top-level official accepted it as "certainly an illegal manipulation of the home page and linking it to a US site."
Operators were taking whatever action needs to be taken, the official said.
The mischief comes just two days after ISRO celebrated five combined - and internationally visible - launches for UK customers on its warhorse PSLV launcher.
The PSLV is a relatively recent and tiny player in the global mega-buck space transportation industry.
Antrix is a Rs.1,700-crore mini-ratna PSU that markets communication transponder capacity to broadcasters, Earth imageries globally and PSLV launch services to foreign government and private customers.
Without giving much details another official said, "We do not know about hacking. Antrix's home page was getting linked to some other [US] site. Antrix's website contains only public information. It is blocked. There is nothing to worry."
The site now says it is being constructed.
