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Telegram Messanger. Sergei Konkov / Getty

If a file titled "article_in_wsj.jpg" looks like a it might be an image file, criminals might be able to trick you into clicking a nasty link through the messaging app, Telegram. A file name processing glitch already being exploited in the wild makes it easy to make one file type seem like another.

In the wild: Researchers at the Kaspersky Lab noticed that Telegram did not check to make sure the app does not reverse the file type and found several instances of the issue dating back to March of last year. Their findings included cryptocurrency mining malware and opening backdoors into systems. The trick seemed to be popular for Russian criminals. Telegram has since patched the vulnerability.

How it works : To allow filenames in languages that read from right to left, Telegram recognizes a formatting marker called a right-to-left override (RLO) character. Any text after a RLO is displayed from right to left. Flip the right letters in "123gpj.js" and you get "1234sj.jpg," turning an potentially malware-hiding javascript (.js) file into what looks like an jpeg image.

Go deeper

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31 mins ago - Economy & Business

First glimpse of the Biden market

Photo: Jonathan Ernst-Pool/Getty Images

Investors made clear what companies they think will be winners and which will be losers in President Joe Biden's economy on Wednesday, selling out of gun makers, pot purveyors, private prison operators and payday lenders, and buying up gambling, gaming, beer stocks and Big Tech.

What happened: Private prison operator CoreCivic and private prison REIT Geo fell by 7.8% and 4.1%, respectively, while marijuana ETF MJ dropped 2% and payday lenders World Acceptance and EZCorp each fell by more than 1%.

Mike Allen, author of AM
1 hour ago - Politics & Policy

Biden-Harris, Day 1: What mattered most

President Joe Biden and first lady Dr. Jill Biden arrive at the North Portico of the White House. Photo: Alex Brandon-Pool/Getty Images

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Driving the news: Today, on his first full day, Biden translates his promise of a stronger federal response to the pandemic into action — starting with 10 executive orders and other directives, Caitlin Owens writes.

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Read: Pete Buttigieg's opening statement ahead of confirmation hearing

Pete Buttigieg, President Biden's nominee to be secretary of transportation, in December. Photo: Kevin Lamarque/AFP via Getty Images

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Driving the news: Buttigieg will testify at 10 a.m. ET before the Senate Committee on Commerce, Science and Transportation. He is expected to face a relatively smooth confirmation process, though GOP lawmakers may press him on "green" elements of Biden's transportation proposals.