The eerie threat came as the group started its thirty-day campaign against international banks with an attack on the central bank of Greece.
A new video by the group – called Shut Down the Banks – has said it will begin a cyber attack campaign against major financial instituions including in China, America and Britain.
The hacking operation against the banks, named Operation Icarus Phase 2, differs form previous anti-banking campaign by specifically naming its targets.
In particular, Anonymous announced a cyber-attack war against the Bank of England and New York Stock Exchange.
In the chilling video, the Anonymous spokesman said: “This is the operation to end all others.”
The organization – made up of international hackers – targeted the Central Bank of Greece’s website on Tuesday with a DDoS attack.
The Anonymous spokesman added: “Today, we have continuously taken down the website of the bank of Greece.
“This marks the start of a 30-day campaign against central bank sites across the world.
“[The banks] feel comfortable in their ivory towers built on the broken backs of labourers of the world.
“It is time to show the world the true power and the true face of the faceless.
“The powers that be have flown to close to the sun and the time has come to set the wings of their empire ablaze and watch the system their power relies on come to a grinding halt and come crashing down around them.
“This time our target is the New York Stock Exchange and Bank of England.
“This is a call to arms, brothers.”
A Bank of Greece official confirmed the attack and said: “The attack lasted for a few minutes and was successfully tackled by the bank’s security systems.
“The only thing that was affected by the denial-of-service attack was our web site.”