Nimda Type Subtype Creator(s) Date Place of Origin Source Language Platform File Type Aliases Family File Size Infection Size Infection Impact Reported Costs MD5 Hash SHA1 Hash CRC32 Hash Nimda is one of the first worms capable of running itself without the user even opening the email. It is also the first to modify sites to offer copies of itself for download. It also has a viral component that infects executable files. It was one of the most destructive worms ever discovered.