LightBasin (UNC1945) Compromises 13+ Global MNO Core Networks

CrowdStrike revealed LightBasin APT compromised 13+ global telecom operators using custom GTP proxy tools.

Target TechnologyGPRS Tunnelling Protocol (GTP-C / GTP-U), SIGTRAN

OSI Network LayerLayer 7 / Core GPRS Roaming Network

Threat Actor / AttributionLightBasin (UNC1945) Chinese APT

Protocol Standard3GPP TS 29.060 (GTP Specification)

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⚙️ Deep-Dive Technical Analysis

LightBasin utilized custom malware like SLGTRAN to emulate GPRS Roaming Exchange (GRX/IPX) nodes, tunneling into MNO internal networks to exfiltrate subscriber data and Call Detail Records (CDRs).

⚡ Vulnerability & Exploit Flow

Exploit Vector:

GTP-C tunneling injection & GRX roaming proxy emulation.

🛡️ Recommended Defense & Mitigation Protocol

Operator Hardening Strategy:

Enforce GTP Firewall validation (GSMA FS.20), IPsec encryption on GRX links, and EDR on Linux core switches.

🚨 Security Impact & Geopolitical Consequence

Prompted CISA Advisory AA21-314A for MNO core network hardening.

📚 Authoritative Standards & External References

📄 CrowdStrike Intelligence Report↗

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