On October 13, Ledger's security team Ledger Donjon rare publicly disclosed the progress of their investigation: they confirmed that a hardware wallet theft incident occurring in Southeast Asia was not due to individual user negligence, but rather indicated a supply chain attack targeting Ledger devices. The affected signed devices were sold by local distributor CryptoBilis, and according to Ledger Donjon's investigation, the internal casing of this batch of devices was implanted with unauthorized malicious hardware. According to publicly available single-source information, this additional circuit could silently read the 24 mnemonic words displayed sequentially on the screen when the user first initializes the Ledger, and then remotely transmits this set of "master keys" through the built-in microcontroller and eSIM, using the LTE cellular network. The financial losses that have emerged so far have also been traced back to related devices sold through the CryptoBilis channel. Ledger clearly pinpointed the attack vector to the supply chain and distribution stage, rather than its own official production line, and gave an initial judgment in the announcement: it can currently only confirm that there are risks with certain devices from the CryptoBilis channel, and there is no evidence that all Ledger products or devices from other regional distributors have encountered similar implantations.

Malicious Chip Hides in Casing to Steal Mnemonic Words

Ledger Donjon's announcement shows that the attackers did not tamper with the official production line, but instead directly shoved unauthorized hardware inside the finished device's casing. This extra implanted module is difficult to detect with the naked eye, yet is placed in a position capable of "seeing" the screen, allowing it to read all content actually displayed on the device. For the average user, what they see is an intact Ledger, fully packaged, with a normal interface; any software-level checks would not reveal anything unusual, as it is not the firmware that has been tampered with, but rather the physical structure of the device.

The truly fatal moment occurs when the user is most relaxed and trusts the hardware the most—initializing the device and writing down the 24 mnemonic words. According to available information, this malicious hardware captures the entire set of 24 words the moment they are displayed on the screen, and then transmits them directly outside via the built-in microcontroller and eSIM using the LTE cellular network. The entire process does not rely on a computer or smartphone, nor does it require any malicious software intervention; it still appears to comply with the best practice of "private keys never being connected to the network." However, this time, the so-called "offline security" has been quietly compromised by a hidden chip in the supply chain, which is the most unsettling part of this incident for the hardware wallet industry.

Southeast Asia Distribution Channel Breached

In its announcement, Ledger Donjon pointed the "knife-edge" at the supply chain rather than the factory production line: existing evidence shows that the implantation of malicious hardware occurred within the Southeast Asian distribution channel and not within Ledger's official production process itself. In other words, devices coming off the production line were initially "clean," and the problem arose in the subsequent distribution process handed to users. This is a typical case of physical tampering at the supply chain level, rather than a traditional firmware backdoor or software attack.

According to single-source information in the public materials, all confirmed cases of asset losses are related to Ledger devices purchased through the Southeast Asian distributor CryptoBilis, with the risk appearing to be geographically and channel-wise concentrated on this lead; at the same time, there is currently no evidence suggesting that other regional distributors or all Ledger devices show signs of similar attacks. For Ledger, this "channel contamination" allows it to narratively cut responsibility from the official production line, while at the same time it has torn a bigger gap in the hearts of Southeast Asian users—when even devices branded with the logo and coming from authorized distributors could be tampered with midway, regional users find it difficult to simply determine security based on "whether it is an official purchase" or "whether it is from an authorized agent." This is the most direct and hardest-to-repair blow to the trust system of hardware wallet brands.

Hardware Wallet Security Myth Torn Open

In the minds of many crypto users, the equation of "hardware wallet = private keys not directly touching the internet = the safest" is almost common knowledge, with offline signing and isolated networks regarded as the ultimate safeguard against all hackers. However, this incident exploited this mindset in reverse: the malicious parties did not attempt to breach Ledger's firmware or signature algorithm, but instead implanted unauthorized hardware components inside the device’s casing; during the initialization phase when users are most relaxed and trusting, they captured the 24 mnemonic words by reading what was displayed on the screen and then, relying on the built-in microcontroller and eSIM, secretly transmitted this information outside through the LTE cellular network. For the average user, the seemingly offline and controllable process of "plugging into a computer, following the prompts to write down the mnemonic words" has been proven completely compromised under the condition of supply chain contamination.

This also forces the market to redraw a previously blurred boundary: the security of a device at the "design level" is not the same as the security at the "supply chain execution level." According to Ledger Donjon’s current investigation, the problematic devices confirmed all come from the Southeast Asian distributor CryptoBilis channel, and the attack point lies in the supply chain and distribution stages, rather than Ledger's official production line. The related malicious hardware is considered an unauthorized component implanted in addition to the official flow, and public information has not shown evidence of systemic implant behavior in the official production process. In other words, existing evidence points to a serious regional supply chain attack rather than a structural disaster that renders all Ledger devices inherently toxic; while acknowledging the myth has been punctured, it is still necessary to avoid equating "this batch of tampered machines" with "all hardware wallets are no longer safe."

Supply Chain Attack Costly Yet Difficult to Fully Prevent

From the attacker’s perspective, jamming a "phantom chip" inside the casing is far more expensive than phishing links or fake websites: one must first obtain the physical device, dismantle, modify it, and then find a way to repackage it to pass through the visual inspections of distributors and end-users. However, once successful, this malicious hardware can read the 24 mnemonic words that scroll across the screen during the user's most relaxed and critical initialization phase, and then quietly transmit them outside through the built-in microcontroller and eSIM accessing the LTE cellular network (according to single-source information). It directly bypasses conventional defenses such as software updates and firmware verification, essentially burying a second key in the "safe" in advance. For a small number of high-value targets, this high-cost for high-return targeted attack path remains appealing.

For end-users, such supply chain attacks show almost no visible clues: malicious hardware is hidden inside the casing, the appearance and system interface are indistinguishable from normal devices, users neither see abnormal pop-ups nor receive alerts about tampered firmware, making it difficult to identify problematic devices through eyeball inspection or common sense checks. This incident mainly occurred within a specific distributor channel, suggesting that what is truly breached often isn’t the chip design studio but rather the distribution phase that appears "merely to sell goods." Moving forward, who will take responsibility for this segment of the link may become a question the entire industry must answer: the admission of distributors, auditing, the traceability records of device circulation, and whether tamper-proof seals and casing designs are sensitive enough to expose "traces of tampering"—these may transform from past subsidiary considerations into a boundary that needs to be reinforced within the hardware security model.

Pitfall Avoidance Checklist: How to Select a Safer Wallet

In this incident, the real problem lies with the CryptoBilis distribution channel, rather than with the Ledger official production line itself. Ledger Donjon has already confirmed and continues to investigate the affected devices. The most direct action suggestion for ordinary users is to treat "where to buy" and "how to initialize" as part of a security model: hardware devices should only be purchased from official stores, authorized channels listed by the official, or long-established reputable first-tier vendors, avoiding "discount goods" from unclear sources or with obviously abnormal pricing. Once you receive the device, initialize it in an environment you fully trust—not in offices, internet cafes, or rentals—when writing down will with mnemonic words, and absolutely do not take photos, screenshots, or cloud backups; if the 24 mnemonic words are intercepted by malicious hardware during the initialization phase and transmitted through cellular networks, the assets at the corresponding addresses may be transferred at any moment. Current public information indicates that known risks are mainly concentrated in certain devices from the CryptoBilis channel, and there is no evidence indicating that all Ledger wallets or other regional distributors are universally "toxic," nor has a clear recall or compensation process been disclosed. This means that before Ledger Donjon provides further announcements, you need to proactively monitor official follow-up announcements, combining your device's purchasing channels and usage scenarios to dynamically adjust habits like asset dispersion and hot-cold separation, minimizing controllable human risks to a lower level.

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