ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,500,923, issued on Dec. 16, was assigned to Microsoft Technology Licensing LLC (Redmond, Wash.).

"Identifying coordinated malicious activities using sequences of requests" was invented by Elham Shaabani (San Carlos, Calif.), James R. Verbus (San Mateo, Calif.) and Ting Chen (Cupertino, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Embodiments of the disclosed technologies create a term frequency-inverse document frequency (tf-idf) model of interactions of user accounts with an online system, and, using the tf-idf model, identify a subset of the user accounts as being involved in a malicious use of the online system. The tf-idf model is created b...