So, hope it helps someone. Some details:

1. It was MEW wallet.
2. Nothing special happens last month.
    No transactions.
3. WiC was bought on ICO and stored here from this time
4. There was just very little ETH on wallet AND! someone send 0.01 ETH, withdraw WiC and after that withdraw rest of ETH (0.0088)

This thief:
https://etherscan.io/address/0x5e4abe6419650ca839ce5bb7db422b881a6064bb
works right now with tons of transactions every 3~5 minutes!

Don't know what to do to stop it