February 26, 2018

Epidemic of cryptojacking can be traced to escaped NSA superweapon

Boingboing writes on the connection between two of the themes often grumbled about in this blog: that Bitcoin muffed the incentives and encourages destructive and toxic behaviour, and that the NSA is the agency that as policy weakens our Internet.

The epidemic of cryptojacking malware isn't merely an outgrowth of the incentive created by the cryptocurrency bubble -- that's just the motive, and the all-important the means and opportunity were provided by the same leaked NSA superweapon that powered last year's Wannacry ransomware epidemic.

It all started when the Shadow Brokers dumped a collection of NSA cyberweapons that the NSA had fashioned from unreported bugs in commonly used software, including versions of Windows. The NSA discovered these bugs and then hoarded them, rather than warning the public and/or the manufacturers about them, in order to develop weapons that turned these bugs into attacks that could be used against the NSA's enemies.

This is only safe if neither rival states nor criminals ever independently rediscover the same bugs and use them to attack your country (they do, all the time), and if your stash of cyberweapons never leaks (oops).

Discovering the subtle bugs the NSA weaponized is sophisticated work that can only be performed by a small elite of researchers; but using these bugs is something that real dum-dums can do, as was evidenced by the hamfisted Wannacry epidemic.

Enter the cryptocurrency bubble: turning malware into money has always been tough. Ransomware criminals have to set up whole call-centers full of tech-support people who help their victims buy the cryptocurrency used to pay the ransom. But cryptojacking cuts out the middleman, stealing your computer to directly generate cash for the malware author. As long as cryptocurrencies continue to inflate, this is a great racket.

Wannamine is a cryptojacker that uses Eternalblue, the same NSA exploit as Wannacry. It's been around since last October, and it's on the rise, extracting Monero from victims' computers.

What's more, it's a cryptojacker written by a dum-dum, and it is so incontinent that slows down critical computers to the point of useless, shutting down important IT infrastructure.

WannaMine doesn’t resort to EternalBlue on its first try, though. First, WannaMine uses a tool called Mimikatz to pull logins and passwords from a computer’s memory. If that fails, Wannamine will use EternalBlue to break in. If this computer is part of a local network, like at a company office, it will use these stolen credentials to infect other computers on the network.

The use of Mimikatz in addition to EternalBlue is important “because it means a fully patched system could still be infected with WannaMine,” York said. Even if your computer is protected against EternalBlue, then, WannaMine can still steal your login passwords with Mimikatz in order to spread.

Cryptocurrency Mining Malware That Uses an NSA Exploit Is On the Rise [Daniel Oberhaus/Motherboard]

Posted by iang at February 26, 2018 05:43 PM

A first look at browser-based Cryptojacking

Shayan Eskandari, Andreas Leoutsarakos, Troy Mursch, Jeremy Clark
(Submitted on 7 Mar 2018)

In this paper, we examine the recent trend towards in-browser mining of cryptocurrencies; in particular, the mining of Monero through Coinhive and similar code- bases. In this model, a user visiting a website will download a JavaScript code that executes client-side in her browser, mines a cryptocurrency, typically without her consent or knowledge, and pays out the seigniorage to the website. Websites may consciously employ this as an alternative or to supplement advertisement revenue, may offer premium content in exchange for mining, or may be unwittingly serving the code as a result of a breach (in which case the seigniorage is collected by the attacker). The cryptocurrency Monero is preferred seemingly for its unfriendliness to large-scale ASIC mining that would drive browser-based efforts out of the market, as well as for its purported privacy features. In this paper, we survey this landscape, conduct some measurements to establish its prevalence and profitability, outline an ethical framework for considering whether it should be classified as an attack or business opportunity, and make suggestions for the detection, mitigation and/or prevention of browser-based mining for non- consenting users.

Posted by: A first look at browser-based Cryptojacking at April 15, 2018 03:12 AM
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