How to find out if the network is infected with viruses?

Question

Browsers

When you connect to the network, obscene spam comes out. How to find out if the network is infected with viruses?

Answer 1

Check your DNS settings. Left DNS servers can be specified, which leads to a bunch of ads with an absolutely clean, patched computer with antivirus installed. Set as DNS server 8,8,8,8 or 8,8,4,4
In very rare cases, a router can be infected, which also redirects DNS requests to the attackers' servers.

Answer 2

first, cure your own computer, get a firewall, antivirus, and then look for viruses on the net;)

Answer 3

Find out if the network is infected - take a clean OS and connect to the wire directly without a router. But in general, the probability of this is about the same as seeing a dinosaur outside your window right now - end devices are still much easier to infect.

Answer 4

collect some traffic from the network with some sniffer in pcap format (maximum 128MB) and send it to virustotal.com .

Answer 5

First, check your browser for malware, run antivirus OS, such as DRWEB Kureit, Kasperych Virus removed tools, and finally all of the above.