Twitter hack alarms experts already concerned about platform’s security.

FILE - This April 26, 2017, file photo shows the Twitter app icon on a mobile phone in Philadelphia.

FILE - This April 26, 2017, file photo shows the Twitter app icon on a mobile phone in Philadelphia.

Matt Rourke / The Associated Press

The extraordinary hacking spree that hit Twitter on Wednesday, leading it to briefly muzzle some of its most widely followed accounts, is drawing questions about the platform’s security and resilience in the run-up to the U.S. presidential election.

Twitter said late Wednesday hackers obtained control of employee credentials to hijack accounts including those of Democratic presidential candidate Joe Biden, former president Barack Obama, reality television star Kim Kardashian, and tech billionaire and Tesla founder Elon Musk.

In a series of tweets, the company said: “We detected what we believe to be a coordinated social engineering attack by people who successfully targeted some of our employees with access to internal systems and tools.”

The hackers then “used this access to take control of many highly-visible (including verified) accounts and Tweet on their behalf.”

The company statements confirmed the fears of security experts that the service itself — rather than users — had been compromised.

Twitter’s role as a critical communications platform for political candidates and public officials, including President Donald Trump, has led to fears that hackers could wreak havoc with the Nov. 3 U.S. presidential election or otherwise compromise national security.

Adam Conner, vice president for technology policy at the Center for American Progress, a liberal think-tank, said on Twitter: “This is bad on July 15 but would be infinitely worse on November 3rd.”

Bitcoin bounty

Posing as celebrities and the wealthy, the hackers asked followers to send the digital currency bitcoin to a series of addresses. By evening, 400 bitcoin transfers were made worth a combined $120,000. Half of the victims had funds in U.S. bitcoin exchanges, a quarter in Europe and a quarter in Asia, according to forensics company Elliptic.

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Those transfers left history that could help investigators identify the perpetrators of the hack. The financial damage may be limited because multiple exchanges blocked other payments after their own Twitter accounts were targeted.

The damage to Twitter’s reputation may be more serious. Most troubling to some was how long the company took to stop the bad tweets.

“Twitter’s response to this hack was astonishing. It’s the middle of the day in San Francisco, and it takes them five hours to get a handle on the incident,” said Dan Guido, CEO of security company Trail of Bits.

An even worse scenario was that the bitcoin fraud was a distraction for more serious hacking, such as harvesting the direct messages of the account holders.

Twitter said it was not yet certain what the hackers may have done beyond sending the bitcoin messages.

“We’re looking into what other malicious activity they may have conducted or information they may have accessed and will share more here as we have it,” the company said.

Mass compromises of Twitter accounts via theft of employee credentials or problems with third-party applications that many users employ have occured before.

Wednesday’s hack was the worst to date. Several users with two-factor authentication — a security procedure that helps prevent break-in attempts — said they were powerless to stop it.

“If the hackers do have access to the backend of Twitter, or direct database access, there is nothing potentially stopping them from pilfering data in addition to using this tweet-scam as a distraction,” said Michael Borohovski, director of software engineering at security company Synopsys.

In 2010, Twitter reached a settlement with the U.S. Federal Trade Commission after it was found the company had lied about efforts to protect users’ information during an extended hack the year before.

Under the terms of the settlement, Twitter was barred for 20 years from misleading users about how it protects the security and confidentiality of private information.

U.S. Rep. Josh Hawley wrote to Twitter and its CEO Jack Dorsey during the hack calling for the company to work with the FBI and Department of Justice to secure its platform, and then answer questions publicly about the effects of the hack.

One of his questions is how the hack may have affected the account of President Donald Trump.

(Reporting by Joseph Menn in San Francisco and Raphael Satter in Washington; Additional reporting by Anna Irrera in New York; Editing by Jonathan Weber and Lincoln Feast.)

With files from Global News’ Sean Boynton

© 2020 Reuters

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