Not mentioned in article: MediaMarkt, the German equivalent of Best Buy, was selling these compromised devices on store shelves in every city in Germany.
Good question: the battery here doesn't look like it had any room for expansion so it wouldn't be worse per se. But normally you want a little bit of room around a battery, I guess a thin foam liner would allow for that and would still allow you to pot the whole thing.
When there are millions of dollars to be stolen, someone can figure out how to remove the potting.
If need be, just grind and cut till you are back to the one silicon wafer that contains crypto keys, then rebuild the whole lot from scratch, add your evil parts, then re-pot it.
That would work on an already configured wallet that you stole but the skill level required is orders of magnitude higher than what's on display here. I know all of the theory on that one but I would probably not be able to pull that off.
The best I've done is to modify a potted chip by very careful thermal imaging to figure out where the part was that blocked the feature I wanted to unlock (market segmentation) and then drill through the case to a depth just higher than the chip. You'd have definitely been able to spot the difference. This was at the millimeter level. Recently there was a post about a group doing this at the chip level, which I thought was extremely impressive, and again, even with the recipe out there duplicating it would still be very hard.
This story is a case of someone tampering with devices in the supply chain, before the user first receives them.
What you’re describing is a different thing. It’s an “evil maid” attack, when you tamper with a wallet that is already set up by the user. Also, it would be ultra difficult and expensive.
What you’re saying is possible. But:
It would probably be cheaper to build a total fake Ledger Wallet, then just replace the new real wallet and deliver a fake with a weak entropy generator. Any case, that’s not what has happened this time.
Oh-Kay_Labs have said it for years. Not only hackers and thieves go for them, but also kidnappers and robbers. If anyone knows you have one, and things could be much worse. Use paper-wallets, old phones and encrypted USBs instead.
>Use paper-wallets, old phones and encrypted USBs instead.
None of these prevent thieves or anybody from knowing you have one worth stealing. The actual solution is to not use fundamentally broken transparent crypto like BTC that broadcasts to the whole world your exact funds and ties them to your identity on every transaction. With monero your funds could be 0,10 or 10 billion and that is nobody's business.
Reminds me of that time when state actors wanted to spread the Stuxnet worm into an air gapped nucleair facility in Iran, and basically hijacked the whole USB supply chain and put the worm in there.
When enough resources / money is involved, these things are to be expected.
There are pictures online. And for an unexplainable reason it is the person behind the biggest Bitcoin exchange SNAFU of all times (where hackers stole something like 800 000 Bitcoins), Mark Karpeles of "Mt. Gox" (who did jail time btw), who was the first to post them:
Apparently the hacker did remove the battery and replace it with a smaller one, leaving enough room for the tiny eSIM/LTE modem / OCR chip that did recognition of the secret on screen.
I had a similar idea to bypass DRM for a while. Some kind of board that goes between the display panel driver and whatever sends it the signal, and outputs something you can capture, e.g. DVI or unencrypted HDMI. Not sure how practical it is.
You should have a paper backup of your hardware wallet anyway. The point of the wallet is to perform cryptographic calculations you’ll probably rather not do in your head.
I already commented the other day on this exploit but really it's fascinating.
I don't care about cryptocurrencies but I've always been fascinated by the cryptography behind it. I've also dabbled with hardware wallets for non-cryptocurrencies stuff: like U2F auth.
The idea of a master secret that is behind a secure element which I control and which I can duplicate is amazing to me (as opposed to, say, "your" passkeys which Google/Microsoft/Apple can basically backup and transfer to other devices for you).
But really to me in the cryptocurrencies world people have been sold the lie that a hardware wallet was secure: it's not. It could be tampered with (as happened in this hack, where an additional rogue chip reading the screen and then sending it using an eSIM steals the secret) but it can also contain a bug (like the recent Coldcard exploit where Coldcard hardware wallets fell back on a RNG with only 32 bits of entropy and some dark-hat hacker cracked those and stole Bitcoins) and, most of all, the vendor of the hardware wallet itself can do nasty attacks (like "kleptography").
From the very start everybody in the ecosystem should have pushed of "n-of-n" schemes (say even just 2-of-2), where one secret goes on a hardware wallet from one vendor and the other secret goes on a hardware wallet from another vendor.
For years and years the tune has been: "PCs cannot be trusted, use a hardware wallet" but it mislead people.
PCs indeed cannot be trusted but unsuspecting users should have learned how to use 2-of-2 or 3-of-3 schemes, to become immune from hacks affecting one hardware wallet vendor.
The typical, non-sensical, response to this is the idiotic: "but if you have two secrets, if you lose one of them you lose everything". It's totally idiotic for people basically save a list of 24 words (the "seed", which is the master secret). Well, guess what: instead of saving a list of 24 words, you save a list of 48 words. Exact same thing, just twice longer.
That's my take: the entire "your coins will be safe if you use a hardware wallet" was misguided.
finally, good use for eSIMs /s
But damn, it's hard problem to fix. Put it in epoxy and while tampering is harder (not impossible! also can just replace whole module), you can't verify it
https://grandideastudio.com/portfolio/security/ledger-hardwa...
They should have posted the weight with and without the device in it.
Also: never leave empty space in a hardware key, pot the whole thing in epoxy.
If need be, just grind and cut till you are back to the one silicon wafer that contains crypto keys, then rebuild the whole lot from scratch, add your evil parts, then re-pot it.
The best I've done is to modify a potted chip by very careful thermal imaging to figure out where the part was that blocked the feature I wanted to unlock (market segmentation) and then drill through the case to a depth just higher than the chip. You'd have definitely been able to spot the difference. This was at the millimeter level. Recently there was a post about a group doing this at the chip level, which I thought was extremely impressive, and again, even with the recipe out there duplicating it would still be very hard.
What you’re describing is a different thing. It’s an “evil maid” attack, when you tamper with a wallet that is already set up by the user. Also, it would be ultra difficult and expensive.
What you’re saying is possible. But:
It would probably be cheaper to build a total fake Ledger Wallet, then just replace the new real wallet and deliver a fake with a weak entropy generator. Any case, that’s not what has happened this time.
...frankly, selling one as DIY kit have highest chance for tamper resistance. Tho pretty untenable with small SMD components sadly
None of these prevent thieves or anybody from knowing you have one worth stealing. The actual solution is to not use fundamentally broken transparent crypto like BTC that broadcasts to the whole world your exact funds and ties them to your identity on every transaction. With monero your funds could be 0,10 or 10 billion and that is nobody's business.
When enough resources / money is involved, these things are to be expected.
Apparently the hacker did remove the battery and replace it with a smaller one, leaving enough room for the tiny eSIM/LTE modem / OCR chip that did recognition of the secret on screen.
They're here. It's wild.
I don't care about cryptocurrencies but I've always been fascinated by the cryptography behind it. I've also dabbled with hardware wallets for non-cryptocurrencies stuff: like U2F auth.
The idea of a master secret that is behind a secure element which I control and which I can duplicate is amazing to me (as opposed to, say, "your" passkeys which Google/Microsoft/Apple can basically backup and transfer to other devices for you).
But really to me in the cryptocurrencies world people have been sold the lie that a hardware wallet was secure: it's not. It could be tampered with (as happened in this hack, where an additional rogue chip reading the screen and then sending it using an eSIM steals the secret) but it can also contain a bug (like the recent Coldcard exploit where Coldcard hardware wallets fell back on a RNG with only 32 bits of entropy and some dark-hat hacker cracked those and stole Bitcoins) and, most of all, the vendor of the hardware wallet itself can do nasty attacks (like "kleptography").
From the very start everybody in the ecosystem should have pushed of "n-of-n" schemes (say even just 2-of-2), where one secret goes on a hardware wallet from one vendor and the other secret goes on a hardware wallet from another vendor.
For years and years the tune has been: "PCs cannot be trusted, use a hardware wallet" but it mislead people.
PCs indeed cannot be trusted but unsuspecting users should have learned how to use 2-of-2 or 3-of-3 schemes, to become immune from hacks affecting one hardware wallet vendor.
The typical, non-sensical, response to this is the idiotic: "but if you have two secrets, if you lose one of them you lose everything". It's totally idiotic for people basically save a list of 24 words (the "seed", which is the master secret). Well, guess what: instead of saving a list of 24 words, you save a list of 48 words. Exact same thing, just twice longer.
That's my take: the entire "your coins will be safe if you use a hardware wallet" was misguided.
Dogs = cryptocurrencies. Fleas = scammed.
(My hardware wallet is made of pleather and holds paper bills.)
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