On April 24, 2022, a privilege escalation hacking tool, KrbRelayUp, was publicly disclosed on GitHub by security researcher Mor Davidovich. KrbRelayUp is a wrapper that can streamline the use of some features in Rubeus, KrbRelay, SCMUACBypass, PowerMad/SharpMad, Whisker, and ADCSPwn tools in attacks.
Although this attack won’t function for Azure Active Directory (Azure AD) joined devices, hybrid joined devices with on-premises domain controllers remain vulnerable. Microsoft Defender for Identity detects activity from the early stages of the attack chain by monitoring anomalous behavior as seen by the domain controller. In addition, signals from Defender for Identity also feed into Microsoft 365 Defender, providing organizations with a comprehensive solution that detects and blocks suspicious network activities, malicious files, and other related components of this attack. Microsoft Defender Antivirus detects this attack tool as the malware family HackTool:MSIL/KrbUpRly.