In April 2021, we observed new targeted attack campaign and we named it "Operation Software Concepts". Operation Software Concepts aimed at Russia, Mongolia and South Korea as attacking targets by using unknown malwares. Some malwares associate to past Royal Road RTF Weaponizer related attacks and ShimRAT by Mofang. In this presentation, we will show the whole case of Operation Software Concepts, the detailed analysis result about the malwares which were used in the operation, and relations of several past attack cases. Afterwards, we will explain the connection to some attack groups.