Apple has pushed a third update to MRT bringing its version to 1.47 dated 18 July 2019.
Apple provides no details as to what changes this brings, but the amazing lightning-fast Mr. Macintosh @ClassicII_MrMac has discovered that this removes a further three variants of the Zoom conferencing web server, for ~/.earthlinkmeetingroomopener, ~/.videoconferenciatelmexopener, and ~/.accessionmeetingopener.
You can check whether this update has been installed by opening System Information via About This Mac, and selecting the Installations item under Software.
A full listing of security data file versions is given by SilentKnight, LockRattler and SystHist for El Capitan, Sierra, High Sierra, Mojave and Catalina, available from their product page. If your Mac has not yet installed this update, you can force an update using SilentKnight, LockRattler, or at the command line.
I have updated the reference pages here which are accessed directly from LockRattler 4.2 and later using its Check blog button.
(Updated 1940 UTC 18 July 2019, with thanks to the amazing Mr. Macintosh.)