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Security researchers at Socket identified a malicious NuGet package named 'Netherеum.All' that impersonated the legitimate Nethereum library by using a Cyrillic 'e' in its name, making it visually indistinguishable from the original. The package was designed to exfiltrate sensitive wallet information, including mnemonics, private keys, keystore JSON, and signed transaction data, by sending it to a command and control server themed after Solana. The threat actor leveraged the popularity of Nethereum, a widely used .NET library for Ethereum, to target developers and users in the cryptocurrency ecosystem.
The malicious package was first published on October 16, 2025, and was reported to the NuGet security team two days later, leading to its removal and the suspension of the associated publisher account. Further investigation linked this campaign to a previous typosquat, 'NethereumNet', which used similar exfiltration techniques and was also removed by NuGet. The attack highlights the risks of homoglyph abuse in package registries and the ongoing threat of supply chain attacks targeting cryptocurrency-related software.
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2 events from the most recent confirmed update back to the earliest known activity.
Public reporting revealed that the malicious package, including the typosquatted name "Netherеum.All," exfiltrated stolen wallet keys through a Solana-themed command-and-control mechanism. This added technical detail clarified the package's impersonation and data theft behavior.
Socket discovered a malicious NuGet package, reported as a typosquat of the legitimate Nethereum library, designed to target developers and cryptocurrency wallet users. The package was described as attempting to steal wallet keys from affected systems.
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Researchers have uncovered a series of malicious packages published to the NuGet open-source platform, specifically targeting cryptocurrency users and developers. These packages, such as the impersonation of the legitimate `Nethereum` library, were designed to steal crypto funds by redirecting transactions to attacker-controlled wallets and exfiltrating sensitive secrets. The campaign, active since at least July 2025, involved at least 14 packages that mimicked legitimate crypto-related tools, using techniques like homoglyphs and typosquatting to evade detection and appear trustworthy. The malicious code was carefully hidden within copied legitimate functionality, making analysis and detection more challenging for defenders. The attackers leveraged multiple open-source ecosystems in their broader campaign, but the recent focus on NuGet marks a significant escalation. The packages were published by various authors over several months, and their malicious intent included both direct theft of funds and the collection of credentials for later exploitation. Security researchers emphasize the sophistication of these attacks, highlighting the need for increased vigilance when using third-party packages in development environments, especially those related to cryptocurrency operations.
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Researchers uncovered a coordinated npm supply-chain campaign in which five packages published from the `galedonovan` account impersonated trusted Solana and Ethereum libraries to steal private wallet keys. The packages used function hooking to intercept sensitive material during normal key-handling operations, including Solana Base58 `decode()` flows and the Ethereum wallet constructor, then exfiltrated the keys in plaintext to a hardcoded Telegram bot, `@Test20131_Bot`, and a group administered by `@crypto_sol3`. The campaign affected both direct installs and transitive dependencies, with `bs58-basic` pulling in the malicious `base-x-64`, while `ethersproject-wallet` closely mimicked the legitimate `@ethersproject/wallet` `5.8.0` release with only a small injected change. One package, `base_xd`, was removed within minutes, but researchers said it shared the same payload and infrastructure as `base-x-64`; four packages were still live when the activity was disclosed. Developers who installed the packages were urged to remove them immediately, treat any exposed private keys as compromised, rotate keys, and move funds to new wallets.
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A malicious NuGet package named `Tracer.Fody.NLog` was discovered impersonating the legitimate .NET tracing library Tracer.Fody, using typosquatting and homoglyph techniques to deceive developers. Published in 2020 under the alias `csnemess`—a near match to the real maintainer's handle—the package successfully evaded detection for over five years, accumulating approximately 2,000 downloads. The malware embedded within the package specifically targets Stratis cryptocurrency wallets, lying dormant until triggered by certain conditions, and then silently exfiltrating wallet data and passwords to attacker-controlled infrastructure in Russia. The attack leverages a common coding pattern by hooking into the `Guard.NotNull<T>` helper method, activating when an object with a `WalletPassword` property is processed. The malicious code scans the default Stratis wallet directory, reads `*.wallet.json` files, and transmits sensitive information without alerting the user or generating logs. The sophisticated use of lookalike package names, maintainer aliases, and Unicode homoglyphs in code identifiers made the threat difficult to detect during manual reviews, highlighting the persistent risks of supply chain attacks in open-source ecosystems.
Jun 29, 2026