1. School of Computer Science and Technology, Harbin Institute of Technology, Weihai 264209, China
2. School of Cyber Science and Technology, Harbin Institute of Technology, Harbin 150001, China
3. China Industrial Control Systems Cyber Emergency Response Team, Beijing 100040, China
4. Institute of Software, Chinese Academy of Sciences, Beijing 100190, China
5. Weihai Cyberguard Technologies Co. Ltd, Weihai 264209, China
6. School of Computer Science and Technology, Anhui University of Technology, Anhui 243002, China
7. School of Computer Science, Guangdong University of Technology, Guangzhou 510006, China