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I’ve been reading about how many data breaches start with an attacker getting into one system and then moving sideways through the network. I’m trying to figure out how to even see that happening on my own small business setup—are there specific logs or alerts I should be watching for that first sign of unusual lateral movement, or is it mostly invisible until it’s too late?

Yeah, I did this in a tiny shop. We started with the basics—endpoint event logs, firewall/VPN logs, and file server access. The first hints were small: a handful of failed logins, then a successful one from a workstation that rarely touched the server. We also caught a new admin account and some odd scheduled tasks on a couple of machines. It was mostly digging through boring lines of data, not a flashy alert.

We tried adding Sysmon on a few boxes to get richer signals, and it did surface odd process trees and new services. It also blew up with noise, so we limited it to high-value machines and kept the rest with the standard logs. When combined with network logs, you could start spotting patterns where one host starts talking to several others after hours.

From a practical angle, push alerts for things like new admins or changes to local groups, unusual outbound connections between internal hosts, and logons that look like network logons rather than local ones. Be wary of sudden bursts of SMB or remote service activity from a single host. If you see a machine suddenly pinging many others or you notice port scans coming from inside the LAN, that's a sign to pause and investigate. It often feels incremental and not one big red flag.

Do you have centralized logging or are you still chasing logs on each machine?

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