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Potential AS-REP Roasting via Kerberos TGT Requests

Detects suspicious Kerberos TGT requests with pre-authentication disabled (Pre-Authentication Type = 0) and Ticket Encryption Type (0x17) i.e, RC4-HMAC. This may indicate an AS-REP Roasting attack, where attackers…

Description

Detects suspicious Kerberos TGT requests with pre-authentication disabled (Pre-Authentication Type = 0) and Ticket Encryption Type (0x17) i.e, RC4-HMAC. This may indicate an AS-REP Roasting attack, where attackers request AS-REP messages for accounts without pre-authentication and attempt to crack the encrypted ticket offline to recover user passwords.

Detection logic

Detection requirements

Log source product
windows
Log source service
security

Known benign triggers

  • Legacy systems or applications that legitimately use RC4 encryption
  • Misconfigured accounts with pre-authentication disabled

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