[WEBC2](https://attack.mitre.org/software/S0109) is a family of backdoor malware used by [APT1](https://attack.mitre.org/groups/G0006) as early as July 2006. [WEBC2](https://attack.mitre.org/software/S0109) backdoors are designed to retrieve a webpage, with commands hidden in HTML comments or special tags, from a predetermined C2 server. (Citation: Mandiant APT1 Appendix)(Citation: Mandiant APT1)