The websites of popular mobile messaging service WhatsApp, security software providers including AVG, Avira have been attacked by the Pro-Palestinian hackers and been redirected to defaced pages.

Dubbed KDMS, the Anonymous-affiliated hackers also claimed responsibility for hacking Twitter, sending pro-Palestinian defacement messages concluding as ‘long live Palestine.’

Reports reveal that all the three websites appear to be the victim of an attack on Network Solutions, which is a domain name registrar and website hosting firm.

Avira security expert Sorin Mustaca said that the firm’s account used to manage the DNS records registered at Network Solutions has received a fake password-reset request not being initiated by anyone at Avira.

"Network Solutions appears to have honoured this request and allowed a third party to assume control of our DNS," Mustaca said.

The hacktivists also claimed responsibility for an attack on hosting firm Leaseweb by successfully affecting a DNS redirect for its homepage.

Several other sites are also the victims of DNS redirection hacks including attacks on The New York Times, Twitter by Syrian Electronic Army, while a Turkish hacker group attacked the websites including the Daily Telegraph, the Register and UPS.