We used DLP Synmantec Solution and it detected that outlook seemed to upload some file to weird URL which is https://upload.box.com. Symantec DLP Rule detected it when outlook client upload some files to somewhere.
From the DLP log, I found below pattern log.
Target URL : https://upload.box.com/test.txt. Even though we don't use box.com solution and we used another 3rd party outlook add-in for large attachment handling, why Symantec DLP detect this URL https://upload.box.com
Can I ask what upload.box.com is?