[BlackMould](https://attack.mitre.org/software/S0564) is a web shell based on [China Chopper](https://attack.mitre.org/software/S0020) for servers running Microsoft IIS. First reported in December 2019, it has been used in malicious campaigns by [GALLIUM](https://attack.mitre.org/groups/G0093) against telecommunication providers.(Citation: Microsoft GALLIUM December 2019)