The team behind the Bitcoin Gold (BTG) cryptocurrency have issued a security alert warning all users about a security incident involving the official Windows wallet application offered for download via its official website.

The official Bitcoin Gold website does not host installers for the official wallet apps but links to files hosted in a GitHub repository.

BTG developers say that someone gained access to this GitHub account and replaced the Windows installer with a "suspicious" file.

SHA-256 checksums did not match

The Bitcoin Gold team detected the breach over the weekend when they noticed that the SHA-256 checksum for the Windows installer did not match the original SHA-256 checksum for the file they initially hosted on the GitHub repo.

According to an ongoing investigation, the GitHub repo served an incorrect file between November 21, 2017, 09:39 UTC, and November 25, 2017, 22:30 UTC.

Developers say the fake wallet app did not trigger any malware detections with antivirus software and they couldn't identify any malicious behavior. Nonetheless, they labeled the file as "suspicious and are advising users against using it.

"Until we know otherwise, all users should presume these files were created with malicious intent – to steal cryptocurrencies and/or user information," they said.

Users advised to move funds, reinstall affected PCs

"If the file was used, the computer on which it was used should be addressed with extreme caution; the file should be deleted, the machine should be thoroughly checked for malware and viruses (or wiped clean), and any cryptocurrencies with wallets accessible on that machine should be moved to new wallet addresses immediately," BTG devs added.

The BTG team has restored the original files and has secured its GitHub account.

Below are the current correct SHA-256 checksums for BTG's Windows and Linux wallet apps. Bitcoin Gold developers said the Linux version of its official wallet app was not changed during the incident.

Windows file SHA-256: 53e01dd7366e87fb920645b29541f8487f6f9eec233cbb43032c60c0398fc9fa bitcoingold-0.15.0-win64-setup.exe Linux file SHA-256: 25d7bf0deb125ecf5b50925a1c58e98c4b0b0a524470379c952f6b9310e97cfe bitcoingold-0.15.0-x86_64-pc-linux-gnu.zip

Bitcoin Gold is the latest hard-fork of the official Bitcoin cryptocurrency, created on October 25. Despite being barely a month old, BTG is already the fifth most popular cryptocurrency on the market, ranked behind Bitcoin (BTC), Ethereum (ETH), Bitcoin Cash (BCH), and Ripple (XRP).

At the time of writing, Bitcoin Gold is traded for around $330 and has a market cap of over $5.5 billion.