Malicious Kerberos proxiable/S4U2self Ticket - CVE-2021-42278/42287 (via security)
- Product
- windows
- Service
- security
- Author
- HuntRule
- Published
- 2026-09-02
- Updated
- 2026-09-02
ATT&CK techniques
Priv Esc → Cred AccessRecon
Resource Dev
Initial Access
Execution
Persistence
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects request a proxiable ticket. This action may trigger while attempting to identify a vulnerable target or using some offsensive Kerberos tools like Kerbrute, Impacket...
Reporting behind it
- attack.mitre.orghttps://attack.mitre.org/techniques/T1558/
- attack.mitre.orghttps://attack.mitre.org/techniques/T1068/
- exploit.phhttps://exploit.ph/cve-2021-42287-cve-2021-42278-weaponisation.html
- thehacker.recipeshttps://www.thehacker.recipes/ad/movement/kerberos/samaccountname-spoofing
- support.microsoft.comhttps://support.microsoft.com/en-us/topic/kb5008380-authentication-updates-cve-2021-42287-9dafac11-e0d0-4cb8-959a-143bd0201041
- github.comhttps://github.com/WazeHell/sam-the-admin
- github.comhttps://github.com/cube0x0/noPac
- github.comhttps://github.com/ly4k/Pachine
- jpcert.or.jphttps://www.jpcert.or.jp/english/pub/sr/20170612ac-ir_research_en.pdf
- ultimatewindowssecurity.comhttps://www.ultimatewindowssecurity.com/securitylog/encyclopedia/event.aspx?eventID=4768
Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.
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