Ethical Hacking News
MeetC2, a serverless command and control (C2) framework leveraging Google Calendar APIs for covert communication, has been unveiled by cybersecurity researchers. This innovative tool allows attackers to hide malicious traffic within legitimate cloud services, making it challenging for security teams to detect and respond to these threats.
MeetC2 is a serverless command and control (C2) framework that leverages the Google Calendar API for covert communication. The framework allows attackers to hide malicious traffic within legitimate cloud services, making it challenging for security teams to detect and respond to these threats. MeetC2 is designed as a proof-of-concept tool to study and demonstrate techniques used by attackers to abuse cloud services. The framework consists of two main components: organizer and guest, which communicate using the Google Calendar API. User must set up a Google Calendar account, enable the Google Calendar API, create a service account, and download its credentials in JSON format to utilize MeetC2. MeetC2 provides command-line options for the organizer and guest binaries, including exec, list, get, clear, and exit. The framework poses significant operational security (OpSec) risks, requiring caution when used, especially in test environments.
MeetC2 is a serverless command and control (C2) framework that has been making waves in the cybersecurity community. This innovative tool leverages the Google Calendar API as a covert communication channel between operators and a compromised system. The MeetC2 framework allows attackers to hide malicious traffic within legitimate cloud services, making it challenging for security teams to detect and respond to these threats.
The development of MeetC2 is rooted in the increasing sophistication of modern adversaries, who have been found to hide C2 traffic inside cloud services. This trend has led researchers to build proof-of-concept (PoC) tools that can mimic these tactics in a controlled environment. The MeetC2 framework is one such PoC tool, designed to study and demonstrate the techniques used by attackers to abuse cloud services.
MeetC2 consists of two main components: the organizer and the guest. The organizer is responsible for creating new events in the compromised system's calendar, while the guest uses polling to check for new events containing commands. When a command is received, the guest executes it locally and updates the event with the output.
To utilize MeetC2, users must first set up a Google Calendar account and enable the Google Calendar API. They then create a service account and download its credentials in JSON format. The organizer binary is compiled using the provided credentials and calendar ID to authenticate with the compromised system's calendar.
The MeetC2 framework provides several command-line options for the organizer and guest binaries, including exec, list, get, clear, and exit. These commands allow users to execute commands on all hosts, list recent commands, retrieve command output, clear executed events, and exit the organizer binary.
Despite its potential as a tool for cybersecurity researchers and training exercises, MeetC2 poses significant operational security (OpSec) risks. The guest binary should be used in test environments only, such as a GCP project that can be purged later.
The emergence of MeetC2 highlights the evolving nature of cyber threats and the importance of staying informed about new attack vectors. As cloud services continue to become more ubiquitous, it is likely that attackers will find new ways to abuse these platforms for malicious purposes.
In conclusion, MeetC2 represents a significant development in the field of cybersecurity research, providing a serverless C2 framework that leverages Google Calendar APIs for covert communication. While its potential as a tool for training exercises and research is promising, users must exercise caution when utilizing this framework due to its OpSec risks.
Related Information:
https://www.ethicalhackingnews.com/articles/The-Emergence-of-MeetC2-A-Serverless-C2-Framework-Leveraging-Google-Calendar-APIs-for-Covert-Communication-ehn.shtml
https://securityaffairs.com/181940/security/meetc2-a-serverless-c2-framework-that-leverages-google-calendar-apis-as-a-communication-channel.html
Published: Sat Sep 6 05:21:35 2025 by llama3.2 3B Q4_K_M
