Day: January 20, 2017

Krebs pinpoints the likely author of the Mirai botnet

The Mirai botnet caused serious trouble last fall, first hijacking numerous IoT devices to make a historically massive Distributed Denial-Of-Service (DDoS) attack on KrebsOnSecurity’s site in September before taking down a big chunk of the internet a month later. But who’s responsible for making the malware? After his site went dark, security researcher Brian Krebs went on a mission to identify its creator, and he thinks he has the answer : Several sources and corroborating evidence point to Paras Jha, a Rutgers University student and owner of DDoS protection provider Protraf Solutions. About a week after attacking the security site, the individual who supposedly launched the attack, going by the username Anna Senpai, released the source code for the Mirai botnet, which spurred other copycat assaults. But it also gave Krebs the first clue in their long road to uncover Anna Senpai’s real-life identity — an investigation so exhaustive, the Krebs made a glossary of cross-referenced names and terms along with an incomplete relational map . The full story is admittedly lengthy, clocking in at over 8000 words, but worth the time to understand how botnet wranglers make money siccing their zombie device armies on unsuspecting targets. The sources that pointed Krebs to Anna Senpai’s identity were involved in using botnets on behalf of shadowy clients, unleashing them on security companies protecting lucrative Minecraft servers that host thousands of players. When their online gaming is obstructed — say, by repeated and annoying DDoS attacks — players leave, giving servers an incentive to jump ship to whichever security provider can ensure protection…in this case, providers that arranged for the botnet attacks in the first place. According to Krebs’ source, his security site was looped into the botnet war after it revealed information in early September leading to the arrest of the two hackers behind the Israeli ‘vDos’ attack service. Anna Senpai was allegedly paid to unleash Mirai on the KrebsOnSecurity site by vengeful clients who’d used the now-defunct vDos, cementing the security firm’s interest. Source: KrebsOnSecurity

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Krebs pinpoints the likely author of the Mirai botnet

Harvard’s soft exosuit makes walking 23 percent easier

Harvard Wyss Institute researchers have been working on a soft exosuit with DARPA’s financial help for years. While they were able to present a proof of concept in 2016, it’s only now that they’ve found out just how much the suit can actually help its wearer. According to a new study published in Science Robotics , Harvard’s exosuit reduces the energy a user needs to exert while walking by 23 percent. It does that by providing assistive force to the ankle at the perfect moment when you take another step. Team leader Conor Walsh said that’s the highest percentage of reduction in energy use observed with an exosuit: “In a test group of seven healthy wearers, we clearly saw that the more assistance provided to the ankle joints, the more energy the wearers could save with a maximum reduction of almost 23% compared to walking with the exosuit powered-off. To our knowledge, this is the highest relative reduction in energy expenditure observed to date with a tethered exoskeleton or exosuit.” Of course, assistive force wouldn’t be as helpful without an effective design. As Wired explains, the muscles and tendons from the hip to the knee need to work together in stabilizing the leg to achieve an efficient stride. So the researchers couldn’t stop with something that only covers the ankles — they had to use garters to connect the ankle straps to a hip girdle. The result is the exosuit’s current form, which you can see below. That said, the researchers admit that they need to conduct follow-up tests. For one, they had the subjects offload the exosuit’s cable-based actuation, electronics and battery units before conducting the experiment. Those make up an additional 17-plus pounds that would have changed the wearers’ situation. Further, they found that the subjects’ gaits changed depending on how much assistive force they provided, which was between 10 to 38 percent of the ankle force needed to take a step. They still need to explore the possibility that the reduction in energy is a result of the subjects’ change in gait rather than the assistive force itself. In the future, Harvard’s exosuit could help the elderly and patients suffering from Parkinson’s, cerebral palsy and other conditions to walk well on their own. As you can guess from that DARPA funding, though, it also has a potential military application: the agency hopes it can help soldiers carry heavy supplies far longer than they’d normally be able to. [Image credit: Wyss Institute at Harvard University] Via: Wired , New Scientist Source: Harvard’s Wyss Institute

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Harvard’s soft exosuit makes walking 23 percent easier