TheShadowBrokers hacking group has released a new batch of documents purportedly taken from the National Security Agency, which suggests that American spies have burrowed deep into the Middle East's financial network.

The documents appear to show that the NSA compromised the Dubai office of the anti-money laundering and financial services firm EastNets.

The company said Friday that the leaked documents were dated and denied that any customer data had been affected.

A screenshot showing 'Eternalromance,' one of the hacking tools leaked by ShadowBrokers

TheShadowBrokers, which startled the security experts last year by releasing some of the NSA's hacking tools, has recently resumed pouring secrets into the public domain.

In a first for TheShadowBrokers, the data includes PowerPoint slides and purported target lists, suggesting that the group has access to a broader range of data than previously known.

'This is by far the most brutal dump,' said Comae Technologies founder Matt Suiche, who has closely followed the group's disclosures and initially helped confirm its connection to the NSA last year.

In a blog post, he said it appeared that thousands of employee accounts and machines from the EastNets' offices had been compromised and that financial institutions in Kuwait, Bahrain and the Palestinian territories had been targeted for espionage.

Global anti-money laundering and financial services firm, EastNet, led by CEO Hazem Mulhim, appears to have been the target of NSA espionage activity according to a hacker group leak

In a statement, EastNets said there was 'no credibility' to the allegation that its customers' details had been stolen.

The company, which helps connect customers to the financial world's electronic backbone, SWIFT, said the ShadowBrokers documents referred to a 'low-level internal server' that had since been retired and that a 'complete check' of its systems had turned up no evidence of any compromise.

The denial drew skepticism from those who'd reviewed the files.

'Eastnets' claim is impossible to believe,' said Kevin Beaumont, who was one of several experts who spent Friday combing through the documents and trying out the code.

Comae Technologies founder Matt Suiche says it appears that financial institutions across the Mideast were targeted for espionage purposes by the NSA

He said he'd found password dumps, an Excel spreadsheet outlining the internal architecture of the company's server and one file that was 'just a massive log of hacking on their organization.'

Repeated messages seeking clarification from EastNets went unreturned.

Beaumont said there was bad news in the release for Microsoft as well, explaining that the malicious code published Friday appeared to exploit previously undiscovered weaknesses in older versions of its Windows operating system — the mark of a sophisticated actor and a potential worry for many Windows users.

The opinion was seconded by Matthew Hickey of Prestbury, England-based cybersecurity company Hacker House.

Cybersecurity Hacker House's Matthew Hickey believes the info dump's Microsoft Windows hacking tool is 'an absolute disaster'

'It's an absolute disaster,' Hickey said in an email. 'I have been able to hack pretty much every Windows version here in my lab using this leak.'

'We are reviewing the report and will take the necessary actions to protect our customers,' a Microsoft spokesperson told WIRED, which reports that if the leaked Windows code is as devastating as it appears to be, it could leave millions of Windows users at risk until the appropriate patches are created.

Hickey told WIRED that the Windows hacking tool appears to target all recent version of Windows, with the exception of the latest, Windows 10.

Several of the tools would let a hacker remotely gain the ability to run their own code on a targeted Windows-operated machine.

'There are exploits here that are quite likely zero days that will let you hack into any number of servers on the internet,' Hickey told WIRED. 'This is as big as it gets. It’s internet God mode.'

Suiche said other documents in the ShadowBrokers release suggested an NSA effort to monitor the world's financial transactions that went beyond EastNets.

'I'll bet it's not the only SWIFT service bureau that's been compromised,' he said.

The NSA did not immediately return emails.