Update v8.19.30

Azure AKS Service Account Token Created via TokenRequest API

Detects an identity minting a service account token via the AKS (Azure Kubernetes Service) TokenRequest API (serviceaccounts/token), excluding known AKS control-plane and platform identities. Adversaries request service account tokens from a compromised identity to impersonate a workload, move laterally, or escalate privileges within the cluster. Coverage includes workload service accounts (system:serviceaccount:*), so a compromised in-cluster token minting a token for another service account is not excluded.

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Repeated Stalled TLS Handshakes via ALPN acme-tls/1 Extension

This rule detects two ALPN-based denial-of-service patterns against TLS servers. The first identifies repeated stalled handshakes advertising the acme-tls/1 ALPN extension with no session established, indicating potential goroutine or worker exhaustion in reverse proxies. The second matches connections where a malformed ALPN extension triggers TLS alerts such as decode_error or illegal_parameter, consistent with zero-length ALPN list exploitation. Both patterns are anomalous outside of scheduled ACME TLS-ALPN-01 certificate validation activity.

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First Time Seen RMM Signer Across the Environment

Identifies a newly observed RMM-related code-signature subject across the Windows Elastic Defend hosts. Attackers often use RMM tools to gain remote access to victim machines and deploy malware.

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Newly Observed RC4 Kerberos Service Ticket Request

Identifies a successful RC4-HMAC Kerberos service ticket request for a requester and service pair that has not been observed during the previous 7 days. A newly observed requester-to-service relationship involving an RC4-encrypted ticket may indicate Kerberoasting.

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Potential Computer Account NTLM Relay Activity

Identifies potential relay activities against a Computer account by identifying authentication events using the computer account coming from from hosts other than the server that owns the account. Attackers may relay the computer account hash after capturing it using forced authentication.

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