Collo 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 Worm.Win32.Collo or Collo (Also known as Email-Worm) is an email worm thought to be from Germany. Aside from some its behavior and its alleged place of origin (though even this is largely speculation, only because its email can come in English and German) little information is available about it.