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WASHINGTON, March 6 ― More than 20,000 US organisations have been compromised through a back door installed via recently patched flaws in Microsoft Corp's email software, a person familiar with the US government's response said yesterday.
The hacking has already reached more places than all of the tainted code downloaded from SolarWinds Corp, the company at the heart of another massive hacking spree uncovered in December.
The latest hack has left channels for remote access spread among credit unions, town governments and small businesses, according to records from the US investigation.
Tens of thousands of organisations in Asia and Europe are also affected, the records show.
The hacks are continuing despite emergency patches issued by Microsoft on Tuesday.
Microsoft, which had initially said the hacks consisted of “limited and targeted attacks,” declined to comment on the scale of the problem yesterday but said it was working with government agencies and security companies to provide help to customers.
It added, “impacted customers should contact our support teams for additional help and resources.”
One scan of connected devices showed only 10 per cent of those vulnerable had installed the patches by yesterday, though the number was rising.
Because installing the patch does not get rid of the back doors, US officials are racing to figure out how to notify all the victims and guide them in their hunt.
All of those affected appear to run Web versions of email client Outlook and host them on their own machines, instead of relying on cloud providers. That may have spared many of the biggest companies and federal government agencies, the records suggest.
The federal Cybersecurity and Infrastructure Security Agency did not respond to a request for comment.
Earlier yesterday, White House press secretary Jen Psaki told reporters that the vulnerabilities found in Microsoft's widely used Exchange servers were “significant,” and “could have far-reaching impacts.”
“We're concerned that there are a large number of victims,” Psaki said.
Microsoft and the person working with the US response blamed the initial wave of attacks on a Chinese government-backed actor. A Chinese government spokesman said the country was not behind the intrusions.
What started as a controlled attack late last year against a few classic espionage targets grew last month to a widespread campaign. Security officials said that implied that unless China had changed tactics, a second group may have become involved.
More attacks are expected from other hackers as the code used to take control of the mail servers spreads.
The hackers have only used the back doors to re-enter and move around the infected networks in a small percentage of cases, probably less than 1 in 10, the person working with the government said.
“A couple hundred guys are exploiting them as fast as they can,” stealing data and installing other ways to return later, he said.
The initial avenue of attack was discovered by prominent Taiwanese cyber researcher Cheng-Da Tsai, who said he reported the flaw to Microsoft in January. He said in a blog post that he was investigating whether the information leaked.
He did not respond to requests for further comment. ― Reuters
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