Find sigma rule 
Attack: Automated Exfiltration
Adversaries may exfiltrate data, such as sensitive documents, through the use of automated processing after being gathered during Collection.(Citation: ESET Gamaredon June 2020)
When automated exfiltration is used, other exfiltration techniques likely apply as well to transfer the information out of the network, such as Exfiltration Over C2 Channel and Exfiltration Over Alternative Protocol.
MITRE
Tactic
- exfiltration
technique
- T1020
Test : Exfiltration via Encrypted FTP
OS
- windows
Description:
Simulates encrypted file transfer to an FTP server. For testing purposes, a free FTP testing portal is available at https://sftpcloud.io/tools/free-ftp-server, providing a temporary FTP server for 60 minutes. Use this service responsibly for testing and validation only.
Executor
powershell