Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Analytics //

Security Monitoring

5/27/2020
05:15 PM
100%
0%

Stay-at-Home Orders Coincide With Massive DNS Surge

A variety of sites saw as much as seven times the number of domain requests in late March and early April, suggesting attackers attempted massive denial-of-service attacks.

An analysis of domain-name system (DNS) requests for 316 major sites across five industries shows a massive "step up" in traffic volume starting the last week of March — the time when many countries and states issued stay-at-home orders due to the pandemic — and continuing through April, according to Farsight Security, a provider of DNS intelligence.

The company, which collects anonymized DNS records and indexes the relationships in those resources, investigated the daily counts of the number of times a request generated a "miss" — that is, a request for the address of a domain, such as darkreading.com, was not present in the domain-name server's store of addresses. Farsight found that the level of misses grew by four to seven times at the end of March and the beginning of April, creating an increase in traffic volume.

Overall, the increase in traffic is somewhat of a mystery, says Paul Vixie, CEO of Farsight Security. A variety of scenarios could explain a rise in DNS traffic — such as misconfiguration or a change in behavior as people started working from home — but the most likely is a massive denial-of-service (DoS) attack, he says.

"We are not in the attribution business, but it looks like someone out there was interested in making some sites harder to reach," Vixie says.

The data shows a significant and unmistakable shift in what is happening on the Internet across five industries, including news, streaming services, travel and transportation, retail, and higher education. Media site Forbes, for example, had DNS queries that rose by more than a factor of five after April 1, from an initial level of about 61,000 queries per day. Other news sites — such as AP News, CNN, and Fox News — showed a similar pattern, as did some transportation sites, such as Allegiant Airlines and Delta Airlines.

"Having run the data, what we're seeing is more traffic in most cases, with some sites exhibiting spikes consistent with DDoS (distributed denial-of-service) attacks exploiting those sites," the report states.

Yet, without further research and data from outside sources, it is unclear what is happening, Vixie says. 

While the most likely scenario is a set of significant DoS attacks, the group characteristics of user behavior might have changed. Or the step up in traffic could be a result of workers leaving a subset of companies into which Farsight may not have good visibility and working on home networks on which the company has better data. There are other possibilities as well, Vixie says.

"I have all kinds of half-baked theories, but I decided, rather than wait until we knew what has caused this, we would put it out there, so that other people who might have seen something at the same times could cross-correlate with us," he says.

Farsight Security's technology looks for DNS cache misses, which occur when the domain name of the site that a user wants to visit is not in the local DNS server's cache. Because most Internet users visit a limited number of sites, DNS caches help to efficiently handle popular requests.

"If the user's query is one for a name that hasn't been seen and cached recently, the recursive resolver must then chase down the information the user requires," the report states. "That's called a 'cache miss.'"

The company does not see all of the cache misses worldwide, but gathers data on a significant enough number that it can find trends in the data. 

The 95-page report includes plots of every site whose DNS queries the company analyzed, with a significant number showing the step pattern. While there are differences in terms of the magnitude of the change — with some universities also seeing a subsequent decline, creating a "hill" pattern — overall the patterns across industries and sites is quite consistent, Vixie says.

"I think this warrants further explanation," he says. "People in the IT world should look at this and say, 'Huh, I wonder if this appears in my traffic graphs.' And then they can ask whether there is some botnet that is contributing to this traffic."

Related Content

 

 
 
 
 
 
 
Learn from industry experts in a setting that is conducive to interaction and conversation about how to prepare for that "really  bad day" in cybersecurity. Click for more information and to register
 
Veteran technology journalist of more than 20 years. Former research engineer. Written for more than two dozen publications, including CNET News.com, Dark Reading, MIT's Technology Review, Popular Science, and Wired News. Five awards for journalism, including Best Deadline ... View Full Bio
 

Recommended Reading:

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
COVID-19: Latest Security News & Commentary
Dark Reading Staff 7/6/2020
Russian Cyber Gang 'Cosmic Lynx' Focuses on Email Fraud
Kelly Sheridan, Staff Editor, Dark Reading,  7/7/2020
Another COVID-19 Side Effect: Rising Nation-State Cyber Activity
Stephen Ward, VP, ThreatConnect,  7/1/2020
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
Special Report: Computing's New Normal, a Dark Reading Perspective
This special report examines how IT security organizations have adapted to the "new normal" of computing and what the long-term effects will be. Read it and get a unique set of perspectives on issues ranging from new threats & vulnerabilities as a result of remote working to how enterprise security strategy will be affected long term.
Flash Poll
The Threat from the Internetand What Your Organization Can Do About It
The Threat from the Internetand What Your Organization Can Do About It
This report describes some of the latest attacks and threats emanating from the Internet, as well as advice and tips on how your organization can mitigate those threats before they affect your business. Download it today!
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-15600
PUBLISHED: 2020-07-07
An issue was discovered in CMSUno before 1.6.1. uno.php allows CSRF to change the admin password.
CVE-2020-15599
PUBLISHED: 2020-07-07
Victor CMS through 2019-02-28 allows XSS via the register.php user_firstname or user_lastname field.
CVE-2020-8916
PUBLISHED: 2020-07-07
A memory leak in Openthread's wpantund versions up to commit 0e5d1601febb869f583e944785e5685c6c747be7, when used in an environment where wpanctl is directly interfacing with the control driver (eg: debug environments) can allow an attacker to crash the service (DoS). We recommend updating, or to res...
CVE-2020-12821
PUBLISHED: 2020-07-07
Gossipsub 1.0 does not properly resist invalid message spam, such as an eclipse attack or a sybil attack.
CVE-2020-15008
PUBLISHED: 2020-07-07
A SQLi exists in the probe code of all Connectwise Automate versions before 2020.7 or 2019.12. A SQL Injection in the probe implementation to save data to a custom table exists due to inadequate server side validation. As the code creates dynamic SQL for the insert statement and utilizes the user su...