Attackers are using GitHub as part of a campaign to spread a novel JavaScript-based RAT called PyStoreRAT, masquerading as widely used OSINT, GPT, and security utilities targeting developers and analysts. The malware campaign leverages small pieces of Python or JavaScript loader code hosted on fake GitHub repositories, which silently fetch and execute remote HTML Application (HTA) files via mshta.exe, initiating a multi-stage infection chain.
PyStoreRAT is said to be a modular, multi-stage implant that can load and execute a wide range of payload formats, including EXE, DLL, PowerShell, MSI, Python, JavaScript, and HTA modules, making it highly versatile once a breach has been established. One of the most prominent follow-on payloads is the Rhadamanthys information stealer, which specializes in the exfiltration of sensitive information, including credentials and financial data. The loaders arrive embedded in repositories branded as OSINT frameworks, DeFi trading bots, GPT wrappers, or security tools; many of these hardly work past statically showing menus or other placeholder behavior to appear legitimate.
It is believed the campaign started at around mid-June 2025, with the attackers publishing new repositories at a steady pace, and then artificially inflating stars and forks by promoting those on YouTube, X, and other platforms. When these tools started gaining traction and hit GitHub's trending lists, the threat actors slipped in malicious "maintenance" commits in October and November, quietly swapping or augmenting the code to insert the loader logic. This factor of abusing GitHub's trust model and popularity signals echoes a trend seen in supply chain-like gimmicks such as Stargazers Ghost Network tactic.
Subsequently, the loader retrieves a distant HTA, which installs PyStoreRAT, a tool that profiles the system, identifies whether it has administrator privileges, and searches for cryptocurrency wallet artifacts involving services such as Ledger Live, Trezor, Exodus, Atomic, Guarda, and BitBox02. It also identifies installed anti-virus software and searches for strings such as “Falcon” and “Reason,” which are attributed to CrowdStrike and Cybereason/ReasonLabs, with what appears to be a modification of the path used to execute mshta.exe to avoid detection.
It uses a scheduled task, which is disguised as an NVIDIA self-update, with the RAT communicating with a distant server for command execution, which includes but is not limited to downloading and executing EXE payloads, delivering Rhadamanthys, unzip archives, loading malicious DLLs via rundll32.exe, unpacking MSI packages, executing PowerShell payloads within a suspended process, instantiating additional mshta.exe, and propagate via portable storage devices by embedding armed LNK documents.
Additionally, it has the capacity to eliminate its own scheduled tasks, which is attributed to making reverse-engineering even more complicated. The Python-based weapons have revealed Russian language artifacts as well as programming conventions that indicate a probable Eastern European adversary, who has described PyStoreRAT as part of a growth toward adaptable, script-based implants that avoid common detection on a targeted environment until a very late stage in the fight.