How lateral movement works
After gaining a foothold, attackers explore the environment, harvest credentials, and connect to other machines using legitimate protocols such as remote desktop, SMB or remote management. Techniques include pass-the-hash, pass-the-ticket, abuse of administrative tools and use of stolen service accounts.
Because the activity often resembles normal administration, it can be hard to spot. Defenders look for unusual authentication patterns, new connections between workstations, use of remote execution tools, and accounts logging in to systems they never touched before. Typical tools include remote desktop, PsExec, WinRM, SSH and scheduled tasks, all of which have legitimate uses and therefore require context to judge properly.
Why it matters for Canadian organizations
Ransomware operators and data thieves rely on lateral movement to reach domain controllers, file servers and backups. The longer they roam, the greater the damage and the harder the recovery.
Containing movement can be the difference between a single infected laptop and a company-wide outage. For Canadian organizations it also limits the scope of personal information exposed, affecting notification duties under PIPEDA and Quebec Law 25. Identity systems are central, because obtaining domain administrator or cloud administrator credentials usually gives attackers the freedom to reach almost anything.
How to defend against it
Segment networks so workstations cannot talk freely to each other, and restrict administrative protocols to designated systems. Enforce least privilege, unique local administrator passwords and multi-factor authentication for remote access.
Collect authentication and endpoint logs centrally, alert on unusual internal connections and credential use, and hunt proactively. Fast isolation of suspect devices through EDR limits how far an attacker can travel. Practice response steps, such as disabling accounts and isolating hosts, in exercises so teams can act within minutes when movement is detected.
Frequently asked questions
What is the difference between lateral movement and privilege escalation?
Lateral movement means moving to other systems or accounts at a similar level of access. Privilege escalation means gaining higher permissions on the same or another system. Attackers frequently combine them, moving sideways to find credentials that let them escalate.
How can lateral movement be detected?
Monitor authentication logs and network flows for unusual logins, new remote connections between workstations, use of administrative tools and credential dumping. Correlating these signals in a SIEM or XDR platform, with analyst review, improves detection.
Does network segmentation stop lateral movement?
It does not stop it entirely, but it significantly restricts it by limiting which systems can communicate. Combined with least privilege and monitoring, segmentation forces attackers to cross controlled boundaries where they are more likely to be detected.
Related service: Cyber defense