Not even a week passes without discovering a new crypto miner that pirates foreign computing power to produce bitcoin and co.The security researchers of F5 have now exposed a new botnet that takes over Linux machines with a trick.

Linux Cryptomining

The botnet named F5 PyCryptoMiner takes over the Linux systems via brute force attacks via the SSH protocol. If a password is guessed about this, the botnet uses the Python interpreter to execute a plain-looking and cryptically named script, which loads another Python script from a command-and-control server. This then sets up a cron job, run every six hours, which then selectively reconciles and handles other activities such as cryptocurrency mining.
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The security experts found evidence that this way alone since December may have produced 158 units of the cryptocurrency with a market value of currently $ 60,000. The attackers obviously use the remote-controlled computers for other purposes. It is particularly important to PyCryptoMiner that the botnet uses a clipboard on the publishing host pastebin.com as a clipboard and does not communicate directly with a specific IP address of a control server. As a result, the network cannot be leveraged by blocking such a server address. One would have to lock the access to Pastebin.

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The corresponding Pastebin reference was called since August 2017 daily about a thousand times. The owner of the registered domain has registered a total of 36,000 additional domains, as well as 235 different e-mail addresses. These would be used among other things for gambling portals and porn sites.

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