: Using your server resources to mine cryptocurrency or launch DDoS attacks.
The specific reference to the ".upd" format in your search is a crucial detail. In official Bitrix workflows, these files are used for installing updates and components. A ".upd" file is essentially a structured archive containing files and instructions for the system. The danger, however, is that a "nulled" version will contain a corrupted .upd file. By presenting a malicious file in this familiar format, attackers exploit the user's trust to install malware that looks like an official update.