Introducing Proactive Hardening and Attack Surface Reduction (PHASR)
Bitdefender, April 29,2025
Attackers frequently gain initial access through compromised credentials or unmanaged devices, essentially 'logging in' rather than 'breaking in.' Once inside, relying on playbooks, they prioritize stealth, using Living off the Land (LOTL) tactics, which mask malicious activities as normal system operations.
To proactively identify and close attack entry points, effectively combating Living off the Land (LOTL) attacks, Bitdefender released Proactive Hardening and Attack Surface Reduction (PHASR) on April 23rd.
In this article, we detail PHASR's functionality and its role in LOTL attack mitigation.