Tuesday, March 28, 2017

Popular attacker tools & techniques: survey results


In my last blog post, I decided to create a survey as to get a better perspective on popular or favourite tools of attackers, red teamers and/or pentesters.

Below  I present the results, with additional & minimal commentary from my side. Comments are below the figures. Note this is not fully indicative of an attacker or threat actor's arsenal, but I do hope it can give anyone some pointers. Enjoy the journey.

Yes, you may use this data as long as you mention the original source, which is this exact blog post. You may find a direct SurveyMonkey link to the results here.




Figure 1 - What do you do
Answered: 76 

First and foremost question: what do you do? Are you a red/blue or purple teamer? Or no idea at all?
Most people that answered were red teamers. Awesome! If you have no idea what any of this means, or you are just starting with all this, then I definitely advise you to read the following:
The Difference Between Red, Blue, and Purple Teams.



Figure 2 - Favourite lateral movement method

Answered: 66

Second question definitely yielded interesting results; with Pass the Hash (PtH) as most favourite or preferred method of lateral movement. Note that I shamelessly used this list from Mitre's ATT&CK page on Lateral Movement here: https://attack.mitre.org/wiki/Lateral_Movement



Figure 3 - Favourite AV bypass tool
Answered: 64 

Bypassing AV can be interpreted quite broadly, but let's say using the most well-known tools with ability to evaded AV - with which Metasploit takes the lead, and Veil a close second.



Figure 4 - Favourite web app pentest tool
Answered: 66

Burp seems to have the biggest share of being most popular or used web app pentest tool.



Figure 5 - Favourite PowerShell tool
Answered: 66

This is definitely one of the, if not the most, interesting results of all questions. PowerShell Empire takes the lead, with PowerSploit following very closely... And not too far off is PowerShell itself. Draw your conclusions.



Figure 6 - Favourite credential dumper

Answered: 67

Mimikatz seems to be the most preferred credential dumper all around.



Figure 7 - Favourite password brute forcer

Answered: 66


Hashcat, Hydra and John the ripper rank amongst the top three of password brute forcers.



Figure 8 - Usage of RATs

Answered: 69 

This question and the next overlap slightly - if an attacker doesn't (or can't) build custom malware, an attacker may be more inclined to use RATs (freely available or not). Building a RAT is definitely more trivial than building or writing custom malware.

However, don't be fooled. If an attacker is strongly motivated, it's not a question of if they'll get on the network, but when. Take appropriate defensive measures.

Figure 9 - Usage of malware
Answered: 58

As I just said: attackers will not hesitate to use custom malware which is adapted to your environment! (and to evade any security controls or measures in place)



Figure 10 - Application Whitelisting bypasses
Answered: 69

A rather surprising result, seeing 11 of the respondents either skipped, or didn't know what Application Whitelisting is. (and as such, how it may be bypassed)

I can definitely recommend you to check out Casey Smith's Catalog of Application Whitelisting Bypass Techniques.


Extra comments

... provided by some of the respondents yielded additional tools and information:

Lateral movement methods:
PowerUpSQL, CrackMapExecWin, smbexec, PowerSCCM, Kerberoasting, Cobalt strike (after obtaining admin creds for another system), WMI, Password reuse.

AV bypass:
PS Empire, PEspin, Shellter, Unicorn.py and even manually.

Web app pentesting:
metasploitHelper, Dirb, dirbuster, Kali2.

PowerShell tools:
Compress-File.ps1, BloodHound, PowerLurk, PowerSkype.ps1, PowerOPS, PowerForensics, Unicorn.py.

Credential dumping:
mimikittenz, go-mimikatz.

Password brute forcing:
Nmap NSE "brute"-category scripts, patator, Invoke-SMBAutoBrute.ps1, HashcatOCL.

RATs and malware:
Empire, Meterpreter (Metasploit), ADC2.ps1, ThinkPwn, manwhoami/Bella, tinymet/Ultimet, CobaltStrike beacons.



Conclusion

You may wonder if every attacker will use every tool on this list. They may well do so, or not use any of the tools and scripts discussed at all, and rather write everything tailored to your environment.

Also keep in mind that an attacker's TTPs may change over the course of weeks, months or even years. However, some tools will always be popular and withstand the test of time.

What's next?

I definitely advise you to either subscribe to feeds, or follow people on Twitter - both red teamers and blue teamers. Often, they both provide a unique insight which in turn will help you to defend better as well. Don't hesitate to share your findings with the community!

Try to think like an attacker. Leave nothing out.


I'm not sure where to start.

Why not start by checking out a real live intrusion that happened, featuring APT29? There's an excellent presentation out there by Matthew Dunwoody and Nick Carr here:

Another excellent blog to check out is: http://adsecurity.org/

Still in doubt? Start Googling some of the TTPs mentioned above and check out their functionality - and shortcomings!


What about PowerShell and all its misuses?

If your organisation has no need for it, disable PowerShell by configuring AppLocker. Note that PowerShell has many valid usages as well, such as logon scripts. There's a short blog post by Michael Schneider here that touches on this very subject: A story about blocking PowerShell

If you do want to use PowerShell, I advise you to upgrade to the latest version (currently v5) and turn on all the logging! A blog post worth reading: Greater Visibility Through PowerShell Logging


What about AV and how it can be bypassed?

AV should never be your only layer of protection. Next-gen or not.


What about... ?

Where there are attackers, there are defenders and vice versa. Use Event Logging. Use Sysmon.


I'm a red teamer, where can I find more information?

A recent post by Artem Kondratenk offers a ton of resources and insight:
A Red Teamer's guide to pivoting


Can I use this data?

Of course! As long as you mention the original source, which is this exact blog post. You may find a direct SurveyMonkey link to the results here.


Thanks to all the participants, and to you for reading!

Please do comment with your feedback or questions or anything else you would like to discuss.

Sunday, March 12, 2017

Survey: favourite Red team / Pentest / Attacker methods & tools


Yesterday I've set up a SurveyMonkey poll in regards to one's favourite Red team / Pentest / Attacker methods & tools.

Purpose of this survey is to get a better insight into which TTPs actual attackers usually use, or at least to get an insight in the most common methods leveraged by red teamers.

Unfortunately, the free version of SurveyMonkey allows only up to 10 questions. Answers are completely anonymous. The survey will run for 7 days, or until 100 responses are received, after which I'll publish a new blog post with the results and some comments.

You can find the survey below, please feel free to complete it and to share:
https://www.surveymonkey.co.uk/r/VSKJJ98

Saturday, February 25, 2017

Android malware on the rise



Recently, a friend of mine encountered an interesting phishing attempt:


The message reads:
DHL has attempted to deliver the parcel no.: 1993747, but nobody was available. Please arrange re-delivery using our mobile app: http://dhl-tracking[.]online/app.apk

In this blog post, we'll analyse the malware in question (Marcher, banking trojan) and provide disinfection and prevention advice. Click on any of the relevant links below according to your needs:

Analysis
Disinfection
Prevention
Conclusion
Resources


Analysis

When you visit the link, a file called app.apk gets downloaded with the following characteristics:

MD5 80c797acf9bdbe225e877520275e15f5
SHA1 f255de54ffbff87067cfa7bc30d6d87a00aded8f
SHA256 fcd18a2b174a9ef22cd74bb3b727a11b4c072fcef316aefbb989267d21d8bf7d
Package name ijrtc.jwieuvxpjavuklczxdqecvhrjcvuho


The application presents itself as 'DHL Express Mobile' while being installed and will ask for device administrator rights:

Figure 1 - System service




















Basically, the app can do anything it desires:

Figure 2 - Permissions; this includes & reading text messages

Figure 3 - Permissions; note the 'modify system settings'


































The payload, or the actual malware that is installed, is the Marcher banking trojan. Recently, it has been masquerading as applications for package delivery, such as DHL in the example above, Posta Online or an app called Alza.

Marcher checks if any of the following antivirus or security products are installed:


Figure 4 - AV list

























... And targets the following applications:

Figure 5 - Targeted apps










Besides targeting antivirus applications, Marcher also uses some nasty tricks to avoid removal:

  • Marcher installs itself as Device Administrator, effectively making the user unable to force the process to stop or uninstall the application normally;
  • When you attempt to force uninstall the application, it will show you the device administrator prompt, as seen in Figure 1, which will continue to pop-up.

All in all, the malware isn't obfuscated much, but still proves to have particular persistence mechanisms. One does not exclude the other.

If you are only here for Indicators of Compromise, please find below:



You may also want to check out my blog post which provides a plethora of options and software/tools on how to analyze Android malware:
Analysing Android files


Disinfection

Marcher proves more difficult to remove as outlined above. The best way in this case is to back up your files and reinstall your operating system.

There is an excellent article on MakeUseOf on how to get to your phone's 'safe mode', create a back-up and finally factory restore or reinstall your operating system:
Dealing with System Problems in Android: Safe Mode, Factory Reset & Restoring Backups

Alternatively, you may try the following steps to remove Marcher, which also involves going into safe mode:



  • Hold down the Power button on the side of your phone until a popup appears.
  • On the menu that shows up, hold down the Power Off option until a popup appears.
  • Tap OK to reboot into Safe Mode.
  • You should now be in Safe Mode.
  • Go to Settings > Security > Device administration > Device administrators or Phone administrators.
  • Tap on the malicious application.
  • Tap Deactivate in the next screen. In our example:


Figure 6 - deactive the app




















  • Now, go to  Settings > Applications or Apps > Manage applications > tap the malicious app > Uninstall.

For normal applications that don't have device administrator rights, only the last step is sufficient.

Afterwards, change all your passwords and notify your bank to be on lookout for any fraudulent transactions. Do this also if your bank is not listed (affected banks pictured in Figure 5).

Additionally, you may want to run a scan with an antivirus or antimalware product for Android. If you're unsure which antivirus to run, you can try Avast (it also detects the Marcher version discussed in this blog post).

You may want to have a look at other antivirus products if Avast does not suit your needs. A good comparison can be found on AV-test's website: The best antivirus software for Android.

Note that the best course, in any case, is to backup your files and reinstall your device! Don't forget to change passwords and notify your bank.



Prevention

  • Don't root your Android device(s).
  • Don't just install any app. Use common sense. When in doubt, do not install the app.
  • Be wary of suspicious-looking apps even when they have a lot of positive feedback. These may be fake comments. Ask friends, colleagues or Google. Still not sure? Do not install the app.
  • Download from official app stores only. Even though malware may exist on Google's Play store, chances are less likely.
  • Use the default, built-in security in Android. For example, do not allow installation of apps from unknown sources and Encrypt Device.
  • Always verify app permissions. Depending on the app, it should not be able to directly call other phone numbers.
  • Back up your files. If something like this ever happens to you, simply reinstall and restore.
  • Install an antivirus. This may be a resident one, meaning no active protection and scanning only.

More useful links are listed below in the Resources section.


Conclusion

While Windows malware still takes the biggest portion, malware for other operating systems is becoming more and more common. In regards to Android, make sure to follow the prevention tips above to stay safe.

Worth noting that, as always, prevention is better than disinfection. Create (and test) back-ups.



Resources

Analysing Android files - Blaze's Security Blog
Dealing with System Problems in Android: Safe Mode, Factory Reset & Restoring Backups - MakeUseOf
DevicePolicyManager - Android developer area
F-Secure Freedome VPN  - F-Secure
How Do I Delete Applications from My Android Device? - Lifewire
The best antivirus software for Android - AV-Test
What Is A Nandroid Backup and How Exactly Does It Work?  - MakeUseOf

IOCs

Sunday, November 20, 2016

Nemucod downloader spreading via Facebook


Earlier today, a friend of mine notified me of something strange going on with his Facebook account; a message containing only an image (an .svg file in reality) had been sent automatically, effectively bypassing Facebook's file extension filter:

'Photo_9166.svg'




















What is an .svg file? From Wikipedia:

Scalable Vector Graphics (SVG) is an XML-based vector image format for two-dimensional graphics with support for interactivity and animation. The SVG specification is an open standard developed by the World Wide Web Consortium (W3C) since 1999.
This means, more specifically, that you can embed any content you want (such as JavaScript). Moreover, any modern browser will therefore be able to open this file.


Contents of our 'photo' are as follows:

Copy of file on Pastebin here












It's a heavily obfuscated script, which, after opening, redirects you to the following website:


Fake Youtube - "You must install the codec extension to watch this video."















A website purporting to be Youtube, including a video from Facebook - of course, you'll need to install an additional extension to view it :)

The extension has no icon and thus seems invisible and has the following permissions:





















Currently, I'm not exactly sure what this extension is supposed to do beside spreading itself automatically via Facebook (harvesting your credentials in the process), but likely it downloads other malware to your machine.

One of my security colleagues had in fact noticed similar behavior and got ransomware (Locky) as payload:



The extensions' description can be one of the following, and seem semi-random. Note that other variations are possible:

One ecavu futolaz corabination timefu episu voloda 
Ubo oziha jisuyes oyemedu kira nego mosetiv zuhum

The Facebook security team as well as Google Chrome's store security team have been notified.

UPDATE 22/11/2016

  • The rogue Chrome extensions are removed from the store. 
  • Facebook is now filtering for SVG files as well:


Test.svg, containing just a window.alert() method







Removal


Remove the malicious extension from your browser immediately:








Additionally, run a scan with your antivirus and change your Facebook password afterwards.

Notify your friends you sent a malicious file, or in the other case, let your friend know he/she is infected. If you keep receiving the same message from your friend, you may want to temporarily block their messages.



Conclusion

As always, be wary when someone sends you just an 'image' - especially when it is not how he or she would usually behave.

Additionally, even though both Facebook and Google have excellent security controls/measures in place, something bad can always happen.

For those interested, all related files have been uploaded to VirusTotal, and their hashes and domains can be found, as always, on AlienVault's OTX:

Monday, November 14, 2016

Cybercrime Report Template



In this blog post I'll be contributing a template or form, made as simple as possible, to enable you to report cybercrime in a more efficient way. Scroll down if you're not interested in the background story.

The purpose or need of this form arose several years ago, when I wrote a blog post about the 'blame game'. In short, I wrote about how we are all guilty of pointing fingers when a cyberincident occurs.

In reality, the only person or entity to blame, is the one that infected you or your organisation. Since publishing that specific post, cooperation has definitely improved - whether that is due to my post or not, I'll leave aside - an example is the No More Ransom project.

The blog post concluded stating that post-infection information is scarce: there is prevention, incident handling, malware cleaning all around - but available information on what to do afterwards was rather poor.

In short: report it to your CERT or local police department!

You can fill in the template below and download and/or print it as a PDF, which you can submit or include to an organisation of your choosing.




The template is also available on the following link:
Cybercrime Report Template

Disclaimer: no information will be sent to me or Jotform at any point.

Additionally to the template included in this blog post, or in link above, it is also seperately available as a PDF.

Organisations that wish to use this template, are free to do so. I have added the source on Github, which you'll be able to find here.



Resources

Please refer to the following websites if you would also like to report this seperately:
Report Cybercrime Online (EU)
IC3 Complaint Referral Form (US)

In case you do not want to report this to a specific law enforcement agency seperately, just fill in the form above. If you are willing, it is possible to share any information through Criminal Intelligence teams - this can be completely anonymous, similar to this form.

Be sure to contact your CERT or local police department to ask if they have such a team or anonymous reporting possiblity (see also links above).

You can find a list of CERTs here:
CERTs by Country - Interactive Map
List of National CSIRTs

APCERT team members