5 Signs Your Network Is Being Targeted by a Botnet

Botnets do not always announce themselves. The signs are usually a pattern of odd network behavior that, taken together, points to a compromised device phoning home or being marshalled for an attack. Catching it early limits the damage.

Unexpected outbound traffic

A device sending large amounts of data at odd hours, especially to foreign IPs, may be part of a botnet doing the bidding of a remote controller.

Repeated connections to the same destination

Bot-infected devices often beacon to a fixed command-and-control address on a schedule. A steady rhythm of connections to one unfamiliar host is a red flag.

Slow, unexplained performance

If a usually-fast machine suddenly drags and nothing local explains it, hidden processes could be mining, scanning or relaying traffic for someone else.

Blacklist entries on your IP

When your own IP starts showing up on reputation feeds you have never appeared on before, a device on your network may have joined a botnet and started misbehaving.

What to do next

Isolate the suspected device, run a full malware scan, check your threat report for the flagged destinations, and rotate your IP if your address is now blacklisted. A follow-up report confirms whether the problem cleared.