[OilCheck](https://attack.mitre.org/software/S1171) is a C#/.NET downloader that has been used by [OilRig](https://attack.mitre.org/groups/G0049) since at least 2022 including against targets in Israel. [OilCheck](https://attack.mitre.org/software/S1171) uses draft messages created in a shared email account for C2 communication.(Citation: ESET OilRig Downloaders DEC 2023)