A hacker was kept talking while Symantec contacted law enforcement during an extortion attempt last month.
YamaTough demanded $US50,000 ($A46,683) from Symantec to destroy stolen Symantec source code and make a public statement denying that he/she stole the data.
A string of emails posted to pastebin by the hacker revealed the exchange between a purported Symantec employee and YamaTough.
Symantec’s US headquarters said the exchange was part of a coordinated investigation with law enforcement to catch the extortionist.
“In January an individual claiming to be part of the ‘Anonymous’ group attempted to extort a payment from Symantec in exchange for not publicly posting stolen Symantec source code they claimed to have in their possession,” the security vendor stated.
“Symantec conducted an internal investigation into this incident and also contacted law enforcement given the attempted extortion and apparent theft of intellectual property.
"The communications with the person(s) attempting to extort the payment from Symantec were part of the law enforcement investigation.”
The company said it could not comment further because the investigation was ongoing.
“We are not going to disclose the law enforcement agencies involved and have no additional information to provide.”
In the leaked email conversation, Symantec appeared to offer to wire the hacker $US1000 ($A933) as “a sign of good faith”, and pay the remaining $US50,000 in $US2500 ($A2333) installments.
Symantec told YamaTough it could not wire the entire amount at once and promised to pay in installments so the hacker wouldn't publish the source code after being paid.
The hacker was promised that Symantec was “not in contact with the FBI” and that for the company, “protecting our company and property are our top priorities”.
“We can't pay you $50,000 at once for the reasons we discussed previously. We can pay you $2,500 per month for the first three months.
"In exchange, you will make a public statement on behalf of your group that you lied about the hack (as you previously stated). Once that's done, we will pay the rest of the $50,000 to your account and you can take it all out at once. That should solve your problem.
"Obviously you still have our code so if we don't follow through you still have the upper hand. “
The hacker claimed to have stolen the source code from Indian Government agencies in order to undermine the state.
In an interview with InfoSec Island, YamaTough apologised to Symantec and said the theft was collateral damage.