GTPDOOR Linux Malware Targets Telecoms, Exploiting GPRS Roaming Networks.
Threat hunters have discovered a new Linux malware called GTPDOOR that’s designed to be deployed in telecom networks that are adjacent to GPRS roaming exchanges (GRX) The malware is novel in the fact that it leverages the GPRS Tunnelling Protocol (GTP) for command-and-control (C2) communications. GPRS roaming allows subscribers to access their GPRS services while they are Read More
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GTPDOOR is the name of Linux based malware that is intended to be deployed on systems in telco networks adjacent to the GRX (GRPS eXchange Network) with the novel feature of communicating C2 traffic over GTP-C (GPRS Tunnelling Protocol – Control Plane) signalling messages. This allows the C2 traffic to blend in with normal traffic and to reuse already permitted ports that maybe open and exposed to the GRX network.
The following diagram illustrates a forseen use of GTPDOOR. Here the actor already has established persistence on the roaming exchange network and access a compromised host by sending GTP-C Echo Request messages with a malicious payload
https://doubleagent.net/telecommunications/backdoor/gtp/2024/02/27/GTPDOOR-COVERT-TELCO-BACKDOOR