Jp_sitemap_master status

Those logs seem harmless to me.

Jp_sitemap is the name of an action executed by the “JetPack” plugin to re-generate the sitemap [1], a special file in XML file with links to all the available pages in the website with a hierarchy, used by web crawlers like Google to determine what pages to index in their search results.

That IP address 157.55.39.58 is owned by Microsoft and used to host one of the multiple instances of their web crawler, MSNBot [2] also known as Bing. You can verify other IP addresses using this tool [3].

What I think is happening is, every time one of these web crawlers hits your website, JetPack is — for whatever reason — regenerating the content of the sitemap file and consequently triggering an action that is considered suspicious by the Sucuri plugin. This may as well be a bug in JetPack or a temporary procedure, you’ll need to ask their developers for confirmation.

As for the other action Jp_vid_sitemap, it seems to be doing exactly the same as the other one explained above, but instead of generating a map with links to the pages and posts, it’s generating a map with links to all the hosted videos, if there is any. Same thing for the Jp_img_sitemap action which seems to be associated to images, probably used by these web crawlers to show images hosted in your websites in their own search results, in Google Images for example.

In conclusion, these events seem normal to me, I wouldn’t worry about them now.

[1] https://en.wikipedia.org/wiki/Site_map
[2] https://en.wikipedia.org/wiki/Msnbot
[3] https://www.bing.com/toolbox/verify-bingbot