ULTRASURF
This signature detects access to the UltraSurf/UltraReach download site, which is a privacy application used to hide a users Internet activity. Traffic from this application is indistinguishable from generic SSL. Downloaders of this application may be attempting to disguise their internet traffic.
Available to all SRX running 12.3X48+
Available to all MX running 20.2R1+
Available to all vSRX running 20.3R1+