Please help to identify the following description belonging to which technique in MITRE and the corresponding tactics: Sandworm Team has acquired open-source tools for their operations, including Invoke-PSImage, which was used to establish an encrypted channel from a compromised host to Sandworm Team's C2 server in preparation for the 2018 Winter Olympics attack, as well as Impacket and RemoteExec, which were used in their 2022 Prestige operations.