Malware
SHEETCREEP
According to Zscaler, SHEETCREEP is a lightweight backdoor written in C# that uses Google Sheets for C2 communication.
SHEETCREEP is a Windows malware family.
Background
Zscaler describes SHEETCREEP as a lightweight C# backdoor that relies on Google Sheets for its C2 communication.
Source: Malpedia (Fraunhofer FKIE).