Category Archives: End-user Focused

Are You Seeing This? Join a Threat Sharing Group!

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Just a quick note today about threat sharing groups. 

I am talking to more and more companies and organizations that are putting together local, regional or vertical market threat sharing groups. These are often adhoc and usually driven by security practitioners, who are helping each other with cooperative defenses and sharing of new tactics and threat patterns (think TTPs (tactics, techniques & procedures)) or indicators of compromise (IOCs). Many times, these are informal email lists or RSS feeds that the technicians subscribe to and share what they are seeing in the trenches. 

A few folks have tried to commercialize them, but in most cases, these days, the sharing is simply free and open. 

If you get a chance to participate in one or more of these open source networks, you might want to check it out. Many of our clients are saying great things about the data they get via the networks and often they have helped contain incidents and breaches in a rapid fashion.

If you want to discuss your network, or if you have one that you’d like me to help promote, hit me up on Twitter (@lbhuston). If you are looking for one to join, check Twitter and I’ll share as folks allow, or I’ll make private connections as possible. 

As always, thanks for reading, and until next time, stay safe out there! 

Where Does Trouble Come From?

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One of the most common questions I get is, “Where does attack traffic come from?”. I want to present a quick and dirty answer, just to show you how diverse illicit traffic sources are. 

To give you a glimpse into that, here is a list of the top 20 ISPs, based on the number of unique malicious source IP addresses who touched one of my HoneyPoint deployments in a single 24 hour period.

The list:

9 korea telecom
7 hinet
6 dynamic distribution ip’s for broadband services ojsc rosteleom, regional branch “urals”
5 sl-reverse
5 sfr
5 rr
5 chinanet jiangsu province network china telecom no.31,jingrong street beijing 100032
5 china mobile communications corporation mobile communications network operator in china internet service provider in china
4 turknet-dsl
4 superonline
4 sbcglobal
4 chinanet jiangsu province network china telecom 260 zhongyang road,nanjing 210037
3 zenlayer inc
3 virginm
3 verizon
3 totbb
3 jsc rostelecom regional branch “siberia”
3 intercable
3 comcastbusiness
3 comcast
3 charter
3 broadband multiplay project, o/o dgm bb, noc bsnl bangalore
3 as13285

As you can see by the above, the list is pretty diverse. It covers sources in many countries and across both domestic and foreign ISPs. In my experience, the list is also pretty dynamic, at least in terms of the top 10-20 ISPs. They tend to spike and fall like waves throughout different time periods. One of these days, maybe I will get around to visualizing some of that data to get a better view of the entropy around it. But, for now, I hope this gives you an idea of the diversity in sources of attacks.

The diversity also makes it very difficult to baseline log activity and such. As such, there may be some effective risk reduction in blocking ISPs by netblock, if your organization can tolerate the risk associated with doing so. But, more on that in another post. Hit me up on Twitter (@lbhuston) and let me know what your firm’s experience with that type blocking has been; if you’ve tried it or are doing it today. I’d love to hear if it reduced log noise, made traffic modeling easier or led to any specific risk reductions.

Thanks for reading! 

Verifying links before you get phished

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Your Mom sends a funny cat video link on YouTube. Your department head sends a link for the training schedule. There’s an email in your Inbox from Amazon for a laptop sale.

Always think twice before clicking on any of those links. Is that email really from Mom or the department head or Amazon? Even if it was really from Mom’s account, is that link really for a cat video on YouTube? Her account, could have been compromised, and the email sent with an obfuscated link.

Phishing works

Phishing campaigns are effective; estimates range from 60 to 90% of all email is a phishing message. MicroSolved’s social engineering exercises have yielded from 11 to 43% success – success meaning recipients have clicked on the benign links in our phishing exercises for clients with their employees. Estimates average 30% of phishing links are clicked.

Obfuscated URL in an Email

So, never click on a link in an email. OK, that may be a little absolute. Only be certain that the link is what you expect it to be. Hover over the link and either a popup or in the status bar of your email client/browser will display the URL. Verify the domain in the link is valid. Simple link obfuscation techniques such as registering a domain named yuotube.com (note the spelling) is an easy phishing and effective trick.

Another trick is hiding the URL behind friendly text, for example, click here. This technique could easily have been used to create a link = stateofsecurity.com – but the the link actually browses to MicroSolved’s home page.

Image links are not immune. That Amazon logo in the email – does that really link to amazon.com? Hover over the link to verify the URL before you click on it. Or better yet, open your browser, type amazon.com in the address bar, then search for and browse to the laptop sale. By the way, don’t browse to yuotube.com, just take my word for it.

Similarly, while browsing or surfing the web, it is always good practice to verify links before you actually click on them. Hover and verify.

Check that browser address bar

So, now that you’ve clicked on that link and landed on the destination web page, are you sure that’s chase.com’s login page? Before you enter your bank account login credentials, check out the URL in the address bar. Make sure it’s https. Any URL that requires you to enter some identification should be over the encrypted protocol, https.

Next, just because the URL has chase.com within it, does not make it a valid chase.com page. Check out the two images below; phishers often trick their victims by obfuscating a URL with a string of an expected valid domain name in the URL:

Note that chase.com is part of the URL, but the login.html page is actually in the badbaddomain.com. The attackers are counting on users to notice the “chase.com” in the URL and click on their link. Once clicked, the user is to taken to a rogue web server with a login page that mimics the real login page for the bank. If the user continues with typing in their authentication credentials, the trap  has sprung – the rogue server has saved the user’s credentials, and the bank account will soon be drained of its funds. Often, after the user enters the credentials, they may be redirected to a valid 404 error page in the user’s bank server, and the user imay be a little confused but unaware that they’ve just given away their credentials.

Current browsers have a feature to help users pick out the actual domain name from the URL – in the top image, the Firefox address bar displays the domain name part of the URL in black font, and everything else in a gray colored font. This is the default behavior; the setting can be changed for the entire URL be the same color format.

Not all browsers display the URL in such a way, Chrome displays the same obfuscated URL as below; the domain and subdomains part of the URL are in black font and the sub-directories and page resource are in grey font:

Shortened URLs

Shortened URLs have become much more popular because of Twitter – it’s a method of reducing a long (regular) URL into a shortened version of usually 10-20 characters. However, because of the condensed URL, it’s not possible to determine the actual address of the link. In this case, it would be wise to copy the shortened URL and validate it with a URL expander website, such as checkshorturl.com or unfurlr.com or unshorten.it.

It’s a minefield out there. Attackers are constantly phishing for their next victim. Be vigilant, beware of what you click, surf safe.

Sources:

https://blog.barkly.com/phishing-statistics-2016

Ransomware TableTop Exercises

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When it comes to Ransomware, it’s generally a good idea to have some contingency and planning before your organization is faced with a real life issue. Here at MicroSolved we offer tabletop exercises tailored to this growing epidemic in information technology. 

 

What if your organization was affected by the Golden Eye or WannaCry today? How quick would you be able to react? Is someone looking at your router or server log files? Is this person clearly defined? How about separation of duties? Is the person looking over the log files also uncharge of escalating an issue to higher management?

 

How long would it take for you organization to even know if it was affected? Who would be in-charge of quarantining the systems? Are you doing frequent backups? Would you bet your documents on it? To answer these questions and a whole lot more it would be beneficial to do a table top exercise. 

 

A table top exercise should be implemented on an annual basis to evaluate organizational cyber incident prevention, mitigation, detection and response readiness, resources and strategies form the organizations respective Incident Response Team. 

 

As you approach an incident response there are a few things to keep in mind:

 

  1. Threat Intelligence and Preparation

An active threat intelligence will help your organization to Analyze, Organize and refine information about potential attacks that could threaten the organization as a whole.

After you gain Threat Intelligence, then there needs to be a contingency plan in place for what to do incase of an incident. Because threats are constantly changing this document shouldn’t be concrete, but more a living document, that can change with active threats.

  1. Detection and Alerting

The IT personal that are in place for Detection and Alerting should be clearly defined in this contingency plan. What is your organizations policy and procedure for frequency that the IT pro’s look at log files, network traffic for any kind of intrusion?

  1. Response and Continuity

When an intrusion is identified, who is responsible for responding? This response team should be different then the team that is in charge of “Detection and Alerting”. Your organization should make a clearly outlined plan that handles response. The worse thing is finding out you don’t do frequent backups of your data, when you need those backups! 

  1. Restoring Trust

After the incident is over, how are you going to gain the trust of your customers? How would they know there data was safe/ is safe? There should be a clearly defined policy that would help to mitigate any doubt to your consumers. 

  1. After Action Review

What went wrong? Murphy’s law states that when something can go wrong it will. What was the major obstacles? How can this be prevented in the future? This would be a great time to take lessons learned and place them into the contingency plan for future. The best way to lesson the impact of Murphy, is to figure out you have an issue on a table top exercise, then in a real life emergency! 


This post was written by Jeffrey McClure.

Petya/PetyaWrap Threat Info

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As we speak, there is a global ransomware outbreak spreading. The infosec community is working together, in the open, on Twitter and mailing lists sharing information with each other and the world about the threat. 

The infector is called “Petya”/“PetyaWrap” and it appears to use psexec to execute the EternalBlue exploits from the NSA.

The current infector has the following list of target file extensions in the current (as of an hour ago) release. https://twitter.com/bry_campbell/status/879702644394270720/photo/1

Those with robust networks will likely find containment a usual activity, while those who haven’t implement defense in depth and a holistic enclaving strategy are likely in trouble.

Here are the exploits it is using: CVE-2017-0199 and MS17-010, so make sure you have these patched on all systems. Make sure you find anything that is outside the usual patch cycle, like HVAC, elevators, network cameras, ATMs, IoT devices, printers and copiers, ICS components, etc. Note that this a combination of a client-side attack and a network attack, so likely very capable of spreading to internal systems… Client side likely to yield access to internals pretty easily.

May only be affecting the MBR, so check that to see if it is true for you. Some chatter about multiple variants. If you can open a command prompt, bootrec may help. Booting from a CD/USB or using a drive rescue tool may be of use. Restore/rebuild the MBR seems to be successful for some victims. >>  “bootrec /RebuildBcd bootrec /fixMbr bootrec /fixboot” (untested)

New Petrwrap/Petya ransomware has a fake Microsoft digital signature appended. Copied from Sysinternals Utils. – https://t.co/JooBu8lb9e

Lastline indicated this hash as an IOC: 027cc450ef5f8c5f653329641ec1fed91f694e0d229928963b30f6b0d7d3a745 – They also found these activities: https://pbs.twimg.com/media/DDVj-llVYAAHqk4.jpg

Eternal Blue detection rules are firing in several detection products, ET Rules firing on that Petya 71b6a493388e7d0b40c83ce903bc6b04  (drops 7e37ab34ecdcc3e77e24522ddfd4852d ) – https://twitter.com/kafeine/status/879711519038210048

Make sure Office updates are applied, in addition to OS updates for Windows. <<Office updates needed to be immune to CVE-2017-0199.

Now is a great time to ensure you have backups that work for critical systems and that your restore processes are functional.

Chatter about wide scale spread to POS systems across europe. Many industries impacted so far.

Bitdefender initial analysis – https://labs.bitdefender.com/2017/06/massive-goldeneye-ransomware-campaign-slams-worldwide-users/?utm_source=SMGlobal&utm_medium=Twitter&utm_campaign=labs

Stay safe out there! 

 

—

3:48pm Eastern

Update: Lots of great info on detection, response, spread and prevention can be found here: https://securelist.com/schroedingers-petya/78870/

Also, this is the last update to this post unless something significant changes. Follow me on Twitter for more info: @lbhuston 

Drupal Security Best Practices Document

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This is just a quick post to point to a great guide on Drupal security best practices that we found recently. 

It was written for the Canadian government and is licensed under the Open Government License platform. 

The content is great and it is available free of charge. 

If your organization uses Drupal, you should definitely check it out and apply the guidance as a baseline! 

Leaking RFC1918 IP Addresses to the Internet

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There has been a lot of conversation with clients about exposing internal DNS information to the public Internet lately. 

There are some security considerations, and a lot of the arguments often devolve into security by obscurity types of control discussions. My big problem with the leakage of internal DNS data to the Internet is that I hypothesize that it attracts attacker interest. That is, I know when I see it at a client company, I often immediately assume they have immature networking practices and wonder what other deeper security issues are present. It sort of makes me deeper attention to my pen-testing work and dig deeper for other subtle holes. I am guessing that it does the same for attackers. 

Of course, I don’t have any real data to back that up. Maybe someone out there has run some honeypots with and without such leakage and then measured the aggregate risk difference between the two scenarios, but I doubt it. Most folks aren’t given to obsess over modeling like I am, and that is likely a good thing.

It turns out though, that there are other concerns with exposed internal DNS information. Here are a few links to those discussions, and there are several more on the NANOG mailing list from the past several years.

Server fault, Quora, and, of course, the RFC1918 that says you shouldn’t leak them. 🙂 

So, you might wanna check and see if you have these exposures, and if so, and you don’t absolutely need them, then remove them. It makes you potentially safer, and it makes the Internet a nicer place. 🙂 

If you have an actual use for leaking them to the public Internet, I would love to hear more about it. Hit me up on Twitter and let me know about it. I’ll write a later post with some use scenarios if folks have them. 

Thanks for reading! 

Quick Look at Ransomware Content

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Ransomware certainly is a hot topic in information security these days. I thought I would take a few moments and look at some of the content out there about it. Here are some quick and semi-random thoughts on the what I saw.

  • It very difficult to find an article on ransomware that scores higher than 55% on objectivity. Lots of marketing going on out there.
  • I used the new “Teardown” rapid learning tool I built to analyze 50 of the highest ranked articles on ransomware. Most of that content is marketing, even from vendors not associated with information security or security in general. Lots of product and service suggestive selling going on…
  • Most common tip? Have good and frequent backups. It helps if you make sure they restore properly.
  • Most effective tip, IMHO? Have strong egress controls. It helps if you have detective controls and process that are functional & effective.
  • Worst ransomware tip from the sample? Use a registry hack across all Windows machines to prevent VBS execution. PS – Things might break…

Overall, it is clear that tons of vendors are using ransomware and WannaCry as a marketing bandwagon. That should make you very suspicious of things you read, especially those that seem vendor or product specific. If you need a set of good information to use to present ransomware to your board or management team, I thought the Wikipedia article here was pretty decent information. Pay attention to where you get your information from, and until next time, stay safe out there!

State Of Security Podcast Episode 13 Is Out

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Hey there! I hope your week is off to a great start.

Here is Episode 13 of the State of Security Podcast. This new “tidbit” format comes in under 35 minutes and features some pointers on unusual security questions you should be asking cloud service providers. 

I also provide a spring update about my research, where it is going and what I have been up to over the winter.

Check it out and let me know what you think via Twitter.