Beware: Fantom ransomware looks like Windows Update but destroys your data

by Ivan Jenic
Ivan Jenic
Ivan Jenic
Troubleshooting Expert
Passionate about all elements related to Windows and combined with his innate curiosity, Ivan has delved deep into understanding this operating system, with a specialization in drivers and... read more
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Windows 10 is all about updates. You basically cannot run the system properly without installing updates here and there. But just like with every aspect of Windows, you have to be careful with downloading updates because some of them might not be what you think they are.

Kaspersky recently warned its users and all Windows users about a new malicious software called Fantom. This Trojan is a ransomware that disguises itself as a regular update for Windows, encrypting user data and making it unavailable to access.

Fantom works just like any other ransomware. Once you download it onto your computer, it will create an encryption key and stores it on a command-and-control server. Once the process is complete, users are not able to access any of the encrypted data without paying for the encryption key.

When a user launches the Fantom executable, the virus simulates Windows Update screen and looks like any other update install. While users think a new, important update is being installed on their computers, Fantom is busy encrypting their files in the background.

Once Fantom does its thing, it deletes all suspicious files and executables and creates a .html ransom note. The ransom note contains further instructions on how to recover your data, by, of course, paying a ransom. Here’s how the ransom note looks:

ransom note fantom

It is not known how Fantom is distributed, but Kaspersky cited a few methods of avoiding it, minimizing the risk of receiving it:

  • Back up your data regularly and keep backup copies of your files on a disconnected external drive. Having a backup means you will be able to restore your system and files even if your PC gets infected.
  • Be cautious: Don’t open suspicious e-mail attachments, stay away from murky websites, and don’t click on dubious online ads. Fantom, like any malware, may use any of these attack vectors to infiltrate your system.
  • Use a robust security solution: For example, Kaspersky Internet Security already detects Fantom as Trojan-Ransom.MSIL.Tear.wbf or PDM:Trojan.Win32.Generic. And even if a yet-unknown sample of ransomware bypassed the antivirus engine, the System Watcher feature, which monitors suspicious behavior, would block it.

We advise you to follow these instructions and to be extremely careful when opening email attachments and downloading data from suspicious sources. There’s no way to get your data back once Fantom encrypts it outside of paying the ransom, which is something you shouldn’t do because even if you pay the ransom, there’s no guarantee you’ll get your data back.


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