Independent's blogging platform is infected with malicious software that affects readers' computers, according to security experts.
Researchers from Trend Micro found that Blogs on the site were modified to install a malware known as Cryptesla on reader devices.
Malware keeps the files in the host's machine for ransom and requires payment for their recovery.
Independent has not commented yet.
According to Trend Micro, ransomware has been present on Independent blogs at least since November 21.
"We announced it on Tuesday - but still today, it's still happening," said Raimund Genes, chief technician in charge of Trend Micro.
"Now we have to publicly warn people who don't use security software like ours."
Malware exploits a security flaw in Adobe Flash Player to install on computer of a victim.
After downloading, it encrypts documents, making them useless without the key to decrypt them, for which ransom requires.
Flash vulnerability has since been repaired, but anyone using an older browser version of the web plug-in might still be at risk.
“For a while, on Tuesday, the malicious software was not working. But it was not because of Independent's solution, but that the attackers were updating the malware with a new release, "Mr Genes said.
“My advice is to upgrade your Flash Player. Always do so immediately when an update is available, because Flash remains one of the main ways attackers undermine your system. "
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