A cloud storage server accesses a plurality of server-stored files of a cloud storage account of a client device. The cloud storage server determines that one or more server-stored files from the plurality of server-stored files are affected by a malware activity. The cloud storage server generates a graphical user interface that includes a detection notification and a confirmation request, the detection notification indicating a detected presence of malware in the one or more server-stored files and metadata corresponding to the one or more server-stored files, the confirmation request indicating a request for the client device to confirm the detected presence of malware in the one or more server-stored files. A confirmation response is received from the client device. The confirmation response identifies at least one of the one or more server-stored files and confirming the presence of malware activity in the identified server-stored files.