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Researchers disclosed a targeted software supply-chain attack involving the NuGet package Newtonsoftt.Json.Net, a typosquat of the legitimate Newtonsoft.Json library, that was designed to tamper with Digitain’s FG-Crash betting backend. JFrog found seven malicious versions published between August and October 2025, with roughly 1,200 downloads, and said the package embedded a working but trojanized JSON assembly that altered JsonConvert.DefaultSettings and later patched the GenerateGameResult method to manipulate crash-game outcomes. The malware reportedly activated only under specific application conditions and after a randomized delay, helping it avoid detection in non-targeted environments.
Later variants increased obfuscation and added data exfiltration, sending manipulated round data to 185.126.237[.]64:5341 while disguising traffic as Seq logging and using the header X-Seq-ApiKey: theperfectheist2025. Researchers said package metadata exposed an internal Digitain repository URL, suggesting the attacker had access to FG-Crash source code or development artifacts. Digitain said it was already aware of the issue and had taken remediation steps, while defenders were urged to remove the counterfeit package, restore clean dependencies, upgrade to the official Newtonsoft.Json release 13.0.3 or newer, clear caches and mirrors, and review historical connections to the identified command-and-control infrastructure.
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JFrog reported that the package targeted Digitain's FG-Crash backend, patched the GenerateGameResult method to rig crash-game outcomes, and in later versions exfiltrated manipulated round data to attacker-controlled infrastructure.
Digitain stated it was already aware of the malicious package issue and had taken remediation steps, though the full scope of exposure remained unknown.
JFrog notified Digitain about the typosquatted NuGet package targeting its FG-Crash backend. Digitain replied two days later saying it was already aware of the issue and had resolved it.
Across August to October 2025, the attacker released seven versions of the malicious package in three generations, evolving its obfuscation, betting-result manipulation logic, and later exfiltration behavior.
The typosquatted NuGet package "Newtonsoftt.Json.Net" was first published, impersonating the legitimate Newtonsoft.Json library as part of a targeted supply-chain attack against Digitain's FG-Crash backend.
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