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MediumElastic detection rulesElastic

Potential SIP Extension Enumeration

Identifies SIP OPTIONS requests targeting many distinct extension values from a single client within two minutes. Attackers and VoIP scanners use OPTIONS sweeps to discover valid users before REGISTER brute force,…

Description

Identifies SIP OPTIONS requests targeting many distinct extension values from a single client within two minutes. Attackers and VoIP scanners use OPTIONS sweeps to discover valid users before REGISTER brute force, toll fraud, or registration hijacking attempts.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

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Detection requirements

Platform
ContainersIaaSLinuxmacOSNetwork DevicesPREWindows

The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.

Known benign triggers

  • Some legitimate provisioning or monitoring tools enumerate extensions during onboarding. Validate the source against known PBX management systems before closing.

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