A WEBC2 backdoor is designed to retrieve a Web page from a pre-determined C2 server. It expects the Web page to contain special HTML tags; the backdoor will attempt to interpret the data between the tags as commands. The family of malware provides the attacker with an interactive command shell, the ability to upload and download files, execute commands on the system, list processes and DLLs, kill processes, and ping hosts on the local network. Responses to these commands are encrypted and compressed before being POSTed to the server. Some variants copy cmd.exe to Updatasched.exe in a temporary directory, and then may launch that in a process if an interactive shell is called. On initial invocation, the malware also attempts to delete previous copies of the Updatasched.exe file.
Created: 2026-02-23
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