Month: February 2021

Enlarge (credit: Aurich Lawson / Ars Technica)

When hackers corral infected computers into a botnet, they take special care to ensure they don’t lose control of the server that sends commands and updates to the compromised devices. The precautions are designed to thwart security defenders who routinely dismantle botnets by taking over the command-and-control server that administers them in a process known as sinkholing.

Recently, a botnet that researchers have been following for about two years began using a new way to prevent command-and-control server takedowns: by camouflaging one of its IP addresses in the bitcoin blockchain.

Impossible to block, censor, or take down

When things are working normally, infected machines will report to the hardwired control server to receive instructions and malware updates. In the event that server gets sinkholed, however, the botnet will find the IP address for the backup server encoded in the bitcoin blockchain, a decentralized ledger that tracks all transactions made using the digital currency.

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  Puro Pro comes in an attractive bamboo box with brass clasp, reminiscent of a good cigar box. [credit: Jim Salter ]

Last December, a representative for Puro Sound Labs offered me a review sample of the company's flagship Bluetooth hybrid headphones. Her timing couldn't have been better—I had surgery scheduled for January 8 that would put me on the couch all day, every day, for two weeks straight with nothing to do but watch movies and television (ideally without driving my wife and kids insane).

The Puro Pro is an over-the-ear design, which can be connected to audio sources via Bluetooth 5.0 pairing or a simple headphone cord. It offers just about any feature you might dream up for a pair of headphones: safety volume limiting (configurable for either 85dBA or 95dBA), 30+ hour battery life, content control via buttons on the left can, active noise cancellation, and even an inline mic for phone calls.

At $200, the Puro Pro costs more than I'd normally spend on a pair of headphones for watching late-night TV and flying on the occasional airplane (my two primary use cases). But after spending several hours per day with the Puro Pro for a couple of months, I would drop the cash in a heartbeat.