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KrbRelayUp is a Windows post-exploitation tool used to obtain local privilege escalation by abusing Kerberos relay and service-creation workflows. It is commonly treated as offensive tradecraft or a proof-of-concept utility rather than a broadly distributed malware family. Observed references center on attack simulation and detection engineering scenarios involving Windows service creation activity mapped to ATT&CK T1543.003. High-confidence reporting in this context does not establish real-world delivery campaigns, persistence beyond the simulated service-creation behavior, data theft functionality, or attribution to a specific threat actor. Its operational relevance is primarily in red-team emulation and defensive testing of Windows privilege-escalation and service-manipulation telemetry.
Mallory pivots from this family to the IOCs, detections, and named campaigns that touch your stack, and pages you when something new lands.
5 distinct techniques documented for this family, organized by ATT&CK tactic.
This research introduced, for the first time, ways to make Windows authenticate to a different Service Principal Name (SPN) than what would normally be derived from the hostname the client is connecting to. This effectively proved that relaying Kerberos authentication is possible.
This research introduced, for the first time, ways to make Windows authenticate to a different Service Principal Name (SPN) than what would normally be derived from the hostname the client is connecting to. This effectively proved that relaying Kerberos authentication is possible.
1 indicator attributed across vendor reports, sandbox runs, and researcher write-ups. Full values are available in Mallory.
File hashes (MD5, SHA-1, SHA-256) from samples and reports.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Mentioned as a proof-of-concept binary embedded in early malicious OneNote documents, not as the main malware subject of this report.
Windows Krbrelayup Service Creation
KrbRelayUp is the named tool/malware discussed in this attack simulation dataset.
Match every observed IP, domain, and hash against your live telemetry.
Named campaigns wielding this family, with evidence pinned to each claim.
CVEs this family uses for access and lateral movement.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Every documented technique, ranked by evidence weight.
Reddit, Mastodon, and CTI community discussion around this family.