SIGMA ransomware could be the ransomware that encrypted your files. Commonly, ransomware uses spam emails and malicious downloads to spread itself, and one of the two probably brought about the contamination on your machine. Ransomware is considered to be one of the most damaging malware you could have as it encrypts data, and requests that you pay to get them back. If if you regularly backup your data, or if malicious program analysts make a free decryptor, file-recovery would not be difficult. You ought to be aware, however, that if those two options are not available, you can lose your data. By paying the ransom, you may not necessarily get your files back so bear that in mind if you are leaning towards paying. There are of cases when file-encoding malware makers just take the money and leave files encoded. Since paying is not a reliable file recovery choice, you need to just uninstall SIGMA ransomware.
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