Sigma Rules

In telecom networks, Sigma is an open, vendor-agnostic detection rule format for log-based events that can be translated into queries for various SIEMs. Telecom SOC teams maintain Sigma rules for OAM access patterns, NF service-call anomalies, and signaling-firewall events to ensure portability of detections.

Categories: Radio Access NetworkSignalingSecurity Controls

Sigma Rules in context

The radio access network is the layer where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations, downgrade attacks and jamming, and defenses hinge on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

Signaling protocols carry the control-plane instructions that set up calls, register subscribers, hand over sessions and route SMS. SS7, Diameter, GTP-C and SIP are the four dominant families, and interconnect exposure of any of them is treated by GSMA FS.11 / FS.19 / FS.20 as a top-tier telecom risk.

To place Sigma Rules in the wider telecom-security picture, review F1 Interface, TM Forum, Zeek, Lawful Interception, RADIUS and SIP.

Related terms

Related topic hubs

  • Signaling Firewall Unified SS7/Diameter/GTP/SMS signaling firewall framework.
  • SS7 Firewall GSMA FS.11 category 1/2/3 SS7 message screening at the STP edge.
  • Diameter Firewall GSMA FS.19 screening at the Diameter Edge Agent on S6a/S9/S13.
  • GTP Firewall GSMA FS.20 GTP-C/GTP-U screening on GRX/IPX borders.

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