Find sigma rule 
Attack: Exfiltration Over Alternative Protocol: Exfiltration Over Unencrypted/Obfuscated Non-C2 Protocol
Adversaries may steal data by exfiltrating it over an un-encrypted network protocol other than that of the existing command and control channel. The data may also be sent to an alternate network location from the main command and control server.(Citation: copy_cmd_cisco)
Adversaries may opt to obfuscate this data, without the use of encryption, within network protocols that are natively unencrypted (such as HTTP, FTP, or DNS). This may include custom or publicly available encoding/compression algorithms (such as base64) as well as embedding data within protocol headers and fields.
MITRE
Tactic
- exfiltration
technique
- T1048.003
Test : MAZE FTP Upload
OS
- windows
Description:
This test simulates MAZE’s ransomware’s ability to exfiltrate data via FTP. Upon successful execution, all 7z files within the %windir%\temp directory will be uploaded to a remote FTP server. Reference: https://www.mandiant.com/resources/tactics-techniques-procedures-associated-with-maze-ransomware-incidents
Executor
powershell
Sigma Rule
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proc_creation_win_susp_web_request_cmd_and_cmdlets.yml (id: 9fc51a3c-81b3-4fa7-b35f-7c02cf10fd2d)
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proc_creation_win_powershell_non_interactive_execution.yml (id: f4bbd493-b796-416e-bbf2-121235348529)
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posh_ps_susp_networkcredential.yml (id: 1883444f-084b-419b-ac62-e0d0c5b3693f)
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posh_ps_web_request_cmd_and_cmdlets.yml (id: 1139d2e2-84b1-4226-b445-354492eba8ba)