Eddy
3
We have Avast installed on all of them and a full virus scan does not detect anything.
The message you get is from the Network Shield provider in Avast. Ofcourse Avast isn't detecting anything related in a virus scan, because it isn't a virus but an exploit.
It looks like neither of the systems has a firewall on it, it also looks like neither of the machines are fully updated with all security patches/updates.
Explanation about exploit
Explanation about DCOM
Microsofts Windows Updates
Microsofts Office Updates