New Ransomware Poses As A Windows Update

Slashdot reader MojoKid quotes an article from Hot Hardware: A security researcher for AVG has discovered a new piece of ransomware called Fantom that masquerades as a critical Windows update. Victims who fall for the ruse will see a Windows screen acting like it’s installing the update, but what’s really happening is that the user’s documents and files are being encrypted in the background…

The scam starts with a pop-up labeled as a critical update from Microsoft. Once a user decides to apply the fake update, it extracts files and executes an embedded program called WindowsUpdate.exe… As with other EDA2 ransomware, Fantom generates a random AES-128 key, encrypts it using RSA, and then uploads it to the culprit. From there, Fantom targets specific file extensions and encrypts those files using AES-128 encryption… Users affected by this are instructed to email the culprit for payment instructions.

While the ransomware is busy encrypting your files, it displays Microsoft’s standard warning about not turning off the computer while the “update” is in progress. Pressing Ctrl+F4 closes that window, according to the article, “but that doesn’t stop the ransomware from encrypting files in the background.”


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