The United States announced a $10 million reward on Tuesday for information leading to the arrest of Guan Tianfeng, a Chinese national wanted for hacking computer firewalls.

Axar.az reports that citing AFP, Guan, 30, is believed to reside in Sichuan Province, China, according to the State Department. An indictment unsealed the same day charged him with conspiracy to commit computer fraud and wire fraud.

The Treasury Department imposed sanctions on Guan’s employer, Sichuan Silence Information Technology Co. Ltd., accusing him and his associates of exploiting a firewall vulnerability in devices sold by UK-based cybersecurity firm Sophos Ltd.

In April 2020, approximately 81,000 firewalls were targeted globally, including over 23,000 in the US, 36 of which belonged to critical infrastructure companies. The malware sought to steal usernames, passwords, and other data while also attempting to deploy ransomware.

According to the indictment, Sichuan Silence sold stolen data and hacking services to Chinese businesses and government agencies, including the Ministry of Public Security.