Valery Marchive reports (translation follows):
Umanis declared, this Monday morning November 16, to have been the subject, “like many other companies, of a cyberattack on November 14″. In its press release, also repeated on social networks, the ESN ensures that “the spread of the virus was immediately stopped, thanks to isolation measures. The computer network and applications were disconnected during the weekend to protect customers and partners ”.
Read more on LeMagIT. It appears that the NetWalker attribution has not been confirmed by Umanis, and may just be speculation at this point.
h/t, @Chum1ng0