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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

Report: Climate change is an "emerging threat" to U.S. economic stability

A firefighter watches an airplane drop fire retardant ahead of the Alisal fire near Goleta on Wednesday, Oct. 13, 2021. Photo: Luis Sinco, Los Angeles Times via Getty Images

A top U.S. financial coordinating organization took several steps on Thursday to manage the growing risks that climate change poses to the U.S. financial system.

Why it matters: While the Biden administration has been taking an all-of-government approach to climate change, like factoring climate risk into planning at the Treasury Department, today's moves by the politically independent Financial Stability Oversight Council (FSOC) carry significant weight.

47 mins ago - World

"I assume full responsibility," Duterte says of drug war

Rodrigo Duterte in 2017. Photo: Linus Escandor II/AFP via Getty Images

Philippines President Rodrigo Duterte said Thursday that he assumes full responsibility for a violent war on drugs that has killed thousands of people, Reuters reported.

Why it matters: Last month the International Criminal Court (ICC) formally authorized an investigation into alleged crimes against humanity during Duterte's war on drugs.

CDC approves boosters for Moderna and J&J and mix-and-match

Boxes containing vials of the Janssen COVID-19 vaccine. Photo: Jon Cherry/Getty Images

The Centers for Disease Control and Prevention's independent advisory panel voted unanimously to recommend booster doses of Moderna and Johnson & Johnson vaccine and allow people to mix-and-match doses.

The big picture: The agency aligns with the Food and Drug Administration authorization Wednesday night which said people could switch to whichever vaccine they wanted for their booster shot.