Fatjon100

I am running Kaspersky internet security with latest updates. I downloaded a file which I know to be a trojan and scanned it on my computer with Kaspersky and it declares it clean and safe. I uploaded the same file to Kaspersky threat intelligence portal and it says it is malware known for 5 years. Why is this? Checksum of the file 0550AE3895700C365561C345F7414E4FB292E16FB545C2E7AA3AC70EC5F27764