Seems to be the s.c under the ambit of capitaland. Most sites seems to be restored but I think the admins left out a few like Tampines Mall's page.
Hackers strike at shopping malls' websitesFrom Stomp:
http://singaporeseen.stomp.com.sg/viewPost1147.aspx15-year-old Tan Chong Der, a student, almost could not believe his eyes when he visited the Plaza Singapura website on 2 January at about 3.30 pm.
The site had been hacked into by mischief-makers.
An hour later, he tried again, and was greeted by the same message posted by the culprits.
Elsewhere, STOMP reader itsmylife also alerted us about Bugis Junction's website being hacked into.
A check on the internet revealed several other malls were affected as well, including Tampines Mall, Junction 8, Funan Digitalife Mall and IMM, which all fell prey to the same hackers all having posted the same message.
STOMP checked with the management of the malls, who told us they were aware of the problem, and investigations are currently underway. The agency in charge of the sites is also working on rectifying the problem.