FBI has launched an investigation after several PC games on the Steam platform were discovered to contain malware.
According to the agency, some of the titles appeared to function like normal games but secretly installed malicious software on players’ computers. The FBI said the threat actor primarily targeted users between May 2024 and January 2026.
The investigation is focusing on several games, including BlockBlasters, Chemia, Dashverse, DashFPS, Lampy, Lunara, PirateFi, and Tokenova. Some of these titles, such as Chemia and PirateFi, were removed from Steam last summer after being found to contain malware.
Steam, the PC gaming distribution platform operated by Valve Corporation, is one of the largest digital marketplaces for games. In 2025, the platform recorded more than 132 million monthly active users and hosted over 117,000 titles. Despite appearing to be legitimate games approved for sale, the infected titles instead installed malicious software on players’ systems.
The FBI is now seeking information from gamers who may have downloaded the affected titles. The agency said it is legally required to identify victims of federal crimes and noted that affected individuals may be eligible for certain services, restitution, and legal rights under federal or state law. Officials also stated that the identities of victims will remain confidential.
Malware campaigns targeting gamers have become increasingly common. In 2023, a fan-made game based on Super Mario from Nintendo was found to contain malware capable of hijacking crypto wallets, stealing passwords, and installing background crypto-mining software.
In March 2024, cybersecurity group VX Underground warned that players searching for cheat software for the Call of Duty series were exposed to malware capable of draining Bitcoin wallets. The campaign was estimated to potentially affect more than 4.9 million gaming accounts across multiple platforms.
More recently, cybersecurity firm Kaspersky reported discovering an infostealer hidden in pirated mods for Roblox and other games.