He's implying an Electrum vulnerability...?

Additionally, think about anyone else that has access or come in contact with your computer or any usb drive in the past. Additionally, since you are on a boat with a 150 kb/s connection that also brings 2 concerns to my mind : 1) you aren't keeping your windows box patched because of your extremely limited bandwidth. 2) You are using a wifi hotspot that is compromised.

The fact that you are so incredulous that you have been compromised is a security concern in itself as their are so many ways to be compromised with the way you store bitcoins. At most you should be upset and slightly shocked that you were compromised but aware that you made some security shortcuts and need to do better in the future.

Again, I'm going to go with the point of failure wasn't you, I would press that there is a failure point with the VPN.  If someone has your info, they could just wait for you to confirm signing the transaction then send it immediately thereafter.  I've read cases of botched tor exit nodes that pass fake blockchain.info credentials to users to log the credentials. 

was the btc cold for a while beforehand?  why were you moving it to this address?

If you have any IT job or a job as a network administrator you are a much higher target for hackers and the NSA/FBI(remember many of them are corrupt as well)

You should always assume that whatever you have in your primary computer that you install software on and browse the internet with can be instantly compromised. I find that this is a good thing to expose myself to with small amounts of bitcoin as it is a cheap way of telling me my computer is compromised(never happened yet) If you do not use cold storage than you need to at least use a hardware wallet.

It doesn't matter that you are security conscientious as security is difficult to do right and all it takes is one mistake or one unlucky encounter.

The attacker is unlikely to know what your balance until it is taken or attacking many people at the same time.

There are many 0day exploits in the wild and your computer if not properly patched with the latest flash/browser/OS patches can be vulnerable to older exploits as well.

Even if you use WPA2 on your local router , if you live in an apartment building and a hacker lives next door and can see your hotspot they can perform a dictionary attack or bruteforce attack on your wifi password and than serve you up a malicious page with a 0 day exploit.

Anti- virus software isn't foolproof and cannot catch many types of infections.

All it takes is one click on a link in a phishing email, one infected jump drive or external plugged in for a brief moment, visiting one page that has a 0 day exploit, 1 piece of infected pirated software or crack, or an insecure wireless AP. This is why you should never store what you cannot lose on a windows machine connected to a network or at least use a hardware wallet.

can you send us a screenshot of your transaction log

I would suggest you to change your password for Bitcointalk and Email now. They may have been leaked.

No, electrum is really different from the Brainwallet. The first one uses a seed of 12 words so it is really impossible to bruteforce it, instead the second one use only a password. I am still thinking that it was a computer problem.


OP can you explain again if you have stored the seed in some .txt file on the pc?

I do not know, it is really strange.

Have you downloaded something of strange in the past days/weeks?

What AV software are you using if I may ask? Have you used this specific Electrum wallet before (or any other addresses from the same seed)? Did you access the wallet before the funds were stolen - or were they just taken immediately after an initial deposit?

A VPN wouldn't really help you in terms of security for this kind of thing - more useful for privacy and anonymity.