The gang, who have dubbed themselves ‘CYBER JIHADIS’ sent a ransom demand after successfully hacking the entire customer data base of the to the communications giant.
The phone and broadband provider said credit card, bank details other personal information were stolen.
TalkTalk said it was “too early to say” how many of its four million UK customers had been affected by the attack.
But today it emerged that already attempts – strangely low-level attempts – had been made to raid customers’ cash.
Discussing the identity of the hackers Adrian Culley, a former detective in the Metropolitan Police’s cyber crime unit, told the BBC Radio 4’s Today Programme: “They are claiming to be from Soviet Russia and be an Islamic cyber jihadi group. They have posted [online] information that appears to be TalkTalk customer private information.”
The comments came after a garbled message was posted online allegedly by those behind the TalkTalk attack.
It said: “We Have adapted To The Security measures Of The Web,, We Cannot Be Stopped… We Will Teach our Children To Use The Web For Allah.. Your Hands Will Be Covered In Blood.. Judgement Day Is Soon.
“WE Are In The Soviet Russia And Near Place, Your Europe, WE control Asia, We Control AMERICA.”
The authenticity of the message is yet to be verified.
Speaking about the ransom demand, a TalkTalk spokeswoman said: “We can confirm we were contacted by someone claiming to be responsible and seeking payment.”
The company urged users to change their passwords and check their bank accounts.
The Metropolitan Police confirmed its Cyber Crime Unit was investigating an allegation of data theft which was reported on Wednesday – but no arrests had been made.