Quote from: ulyashkin.am on May 21, 2018, 03:05:54 AM

Good afternoon. A very unpleasant situation happened. I wanted to make a mass payment on bitcoin-addresses using the functionality of Electrum. Replenished the purse at 0.15 BTC
https://blockchain.info/en/tx/6a42ea66026653758c08d14e946a64e19794a408a937bf329445b0a7e57f2924
after which, almost immediately, a transaction appeared in the wallet to output a completely unknown address to me:
https://blockchain.info/tx/ecf39b1efd1a93923f2ab568a1c2b1cfd88c7a9f730c5e22db3305bd2299de6f for the amount of 0.1485 BTC. I did not commit it.

For the sake of the experiment, I re-added the purse to 0.05BTC - the situation repeated. Immediately there was a transaction to output to another completely unknown to me address.
Replenishment to 0.05 BTC: https://blockchain.info/tx/a14911f71e6ae99f5a38e5d789d30d31b6ae65e91584364853e4fa8b78efeb24
Formed output to 0.0495 BTC:
https://blockchain.info/tx/1030397a12a983b8818a4af309c05fd42dece6a82b3cd58e8fb21c3522bd2435

I did not make this conclusion either. How could this happen?
https://yadi.sk/i/EMOMFYUL3WGLDG - screenshot of the program window I enclose. At the time of the incident, the version of Electrum 3.0.5

Even with that 0.003 balance had been swept out until the last satoshi. The thing on here that you had seen that output of 0.25 bitcoins you should didn't tend to put up another 0.05 balance because its clearly seen that someones do have the access of your wallet. All transactions which haven't done by you do signifies someone do have your seed this is the most possible case why this thing do happen and that's an easy money for that hacker and as suggested above never use that wallet again. Clean your pc or better to reformat it then install electrum then store up seed not on cloud.