Visitors to the site will see a different page, with the words "Hacked by CR1M3 ORG4N1Z4DO" (organized crime in Portuguese) and KKND. A message at the bottom of the page says: "Talita, te amo! muito!" (Talita, I love you! Very much!).
Techmonth 2000 was held last September to promote enterprise technology.
According to The Straits Times, the source code of the defaced page indicates that the hacking could be the work of a group of five hackers who call themselves KKND, ph4nt4, raver, calvim and nessus.
IT security consultant Lim Kah Chuan found the defaced site when he visited a site that lists hacking incidents.
"It's probably something done out of fun," is Lim's opinion, as opposed to an attack with hostile intentions.