Holding Hospitals Hostage | TechSNAP 261

chris

6 years ago

Find out about another hospital that accidentally took advantage of free encryption, researchers turn up a DDoS on the root DNS servers & the password test you never want to take.

Plus your batch of networking questions, our answers & a packed round up!

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Show Notes:

Researchers at VeriSign investigate DDoS on root DNS servers

Researchers from VeriSign, the company that runs the .com and .net registries, and operations 2 of the 13 critically import root DNS servers, will be giving a talk at a conference detailing their investigation into the attack
Their findings suggest the attack, which took place in November of 2015, was not directed at the root name servers directly, but was an attempt to down two chinese websites
The attack had some interesting patterns, likely caused by design decisions and mistakes made by the programmer of the botnet that was used in the attack
The provide a video showing a breakdown of the attack
It was interesting to learn that Randall Munroe (of XKCD fame) actually came up with the best way to visualize the distribution of IP addresses, with a grid where sequential numbers are in adjacent squares
Only IP addresses in the first 128 /8 netbooks were used. The use of 128/8 specifically suggests an less than or equal, rather than an equal was used during the comparison of IP addresses
It is not clear why a larger set of addresses were not used
The attack seemed to use 3 or 4 different groups of bots, sending spoofed DNS requests
Two of the larger groups of bots sequentially cycled through the 2.0.0.0/8 through 19.0.0.0/8 subnets at different speeds
Attacks were not seen from the 10.0.0.0/8 and 127.0.0.0/8 networks, for obvious reasons
However, a delay in the attacks sourced from 11.0.0.0/8 suggests that the botnet attempted to use the entire 10 block, but the packets just never left the source networks
“The researchers also note that Response Rate Limiting was an effective mitigation in countering up to 60 percent of attack traffic. RRL is a feature in the DNS protocol that mitigates amplifications attacks where spoofed DNS queries are used to target victims in large-scale DDoS attacks.”
“In addition to RRL, the researchers said attack traffic was easily filterable and through filtering were able to drop response traffic for the attack queries, leaving normal traffic untouched. One of the limitations with this approach is that it’s a manual process”

Virus hits Medstar hospital network, Hospital forced to shutdown systems

“The health system took down some its computers to prevent the virus from spreading, but it’s not clear how many computers — or hospitals — are affected”
“A statement by the health system said that all facilities remain open, and that there was “no evidence of compromised information.””
“The not-for-profit healthcare system operates ten hospitals across the Washington and Baltimore region, with more than a hundred outpatient health facilities. According to the system’s website, it has more than 31,000 employees and serves hundreds of thousands of patients annually.”
“One visitor to the hospital told ZDNet that staff switched the computers off after learning about the virus. The person, who was visiting a patient in one of the healthcare system’s Washington DC hospital, said the computers were powered off for more than an hour, with all patient orders lost, the person said.”
“It’s not clear exactly what kind of malware was used in Monday’s cyberattack. A spokesperson for MedStar Health did not immediately respond to a request for comment.”
An FBI spokesperson confirmed that it was “aware of the incident and is looking into the nature and scope of the matter.”
Additional Coverage: Threat Post
After a few days, the medical network was recovering
“The healthcare provider said the attack forced it to shut down its three main clinical information systems, prevented staff from reviewing patient medical records, and barred patients from making medical appointments. In a statement issued Wednesday, it said that no patient data had been compromised and systems were slowly coming back online.”
“Clinicians are now able to review medical records and submit orders via our electronic health records. Restoration of additional clinical systems continues with priority given to those related directly to patient care”
“While the hospital still won’t officially confirm the attacks were ransomware related, The Washington Post along with other news outlets are reporting that employees at the hospital received pop-up messages on their computer screens seeking payment of 45 Bitcoins ($19,000) in exchange for a digital key that would decrypt data”
“The MedStar cyberattack is one of many hospitals in recent months targeted by hackers. Last week, Kentucky-based Methodist Hospital paid ransomware attackers to unlock its hospital system after crypto-ransomware brought the hospital’s operations to a grinding halt. Earlier this year Los Angeles-based Hollywood Presbyterian Medical Center paid 40 Bitcoin ($17,000) to attackers that locked down access to the hospital’s electronic medical records system and other computer systems using crypto-ransomware.”
As long as hospitals continue to pay out, this will only grow to be a worse problem
“Medical facilities don’t give security the same type of attention that other verticals do,” said Craig Williams, senior technical leader for Cisco Talos. “They are there to heal people and cure the sick. Their first priority is not to take care of an IT environment. As a result it’s likely the hackers have been out there for quite some time and realized that there are a lot (healthcare) sites that have a lot of base vulnerabilities.”
As you might expect: 1400 vulnerabilities to remain unpatched in medical supply system
Additional Coverage
In related news:
Canadian hospital website compromised serves up the Angler malware kit to visitors
The site is for a hospital in a small city that serves a mostly rural area. Happens to be where I grew up, and the hospital I was born in
The hospital site is run on Joomla, and is running version 2.5.6, which has many known vulnerabilities. The latest version of Joomla is 3.4.8
“Like many site hacks, this injection is conditional and will appear only once for a particular IP address. For instance, the site administrator who often visits the page will only see a clean version of it, while first timers will get served the exploit and malware.”
The obvious targets are “staff, patients and their families and visitors, as well as students”
The hospital became a teaching facility for McMaster University’s Faculty of Health Sciences in 2009
“The particular strain of ransomware dropped here is TeslaCrypt which demands $500 to recover your personal files it has encrypted. That payment doubles after a week.”

CNBC Password Tester — How not to do it

CNBC has a post about constructing secure passwords
The basic idea was that you submit your password, and it tells you how strong it is
There are obvious problems with this idea. Why are you giving out your password anyway?
Of course, the CNBC site is served in plain text (which is fine for a news site), but it means your password is sent to them in the clear
Worse, they had the site adding all of the submitted passwords to a google spreadsheet, also in the clear
Because the password was submitted as a GET variable, and was in the URL, it was also included in the referral information sent to all of the advertising networks in the CNBC site, including DoubleClick, ScoreCardResearch, something hosted at Amazon AWS, and any other widgets on the site (Facebook, Gigya)
If you actually did want to build a tool like this, at least use javascript to perform the calculations on the users’ device and never transmit their passwords
Of course, users should never type the password into another website. This is the definition if a phishing attack
The page has since been removed
Additional Coverage