"We are Unbeatable. You...kill innocent people in Kashmir and call your self defenders of your country. You...violate the ceasefire on border and call it 'Surgical Strikes'. Now kiss the burn of Cyber War," the hackers said in the post replete with expletives.
The cyber attack was noticed around 7:15 pm.
When contacted, the office of NGT Chairperson Justice Swatanter Kumar said that he was not available for comments.
Seven terror launch pads were targeted across the LoC by special forces of the Indian army during the 'surgical strike' on September 29.
This is the second time after 2013 that the website has been hacked.
In April, 2012, the Delhi high court bar association's website was defaced by Pakistani hackers.
How our commandos delivered the message at Pakistan's door
America won't stop India from more such strikes
In death and in life, they chose the Army
India stands united as a nation today
After the surgical strikes, what can we expect?