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2020年6月8日星期一

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Related articles

Thousand Ways To Backdoor A Windows Domain (Forest)

When the Kerberos elevation of privilege (CVE-2014-6324 / MS14-068) vulnerability has been made public, the remediation paragraph of the following blog post made some waves:
http://blogs.technet.com/b/srd/archive/2014/11/18/additional-information-about-cve-2014-6324.aspx

"The only way a domain compromise can be remediated with a high level of certainty is a complete rebuild of the domain."

Personally, I agree with this, but .... But whether this is the real solution, I'm not sure. And the same applies to compromised computers. When it has been identified that malware was able to run on the computer (e.g. scheduled scan found the malware), there is no easy way to determine with 100% certainty that there is no rootkit on the computer. Thus rebuilding the computer might be a good thing to consider. For paranoids, use new hardware ;)

But rebuilding a single workstation and rebuilding a whole domain is not on the same complexity level. Rebuilding a domain can take weeks or months (or years, which will never happen, as the business will close before that).

There are countless documented methods to backdoor a computer, but I have never seen a post where someone collects all the methods to backdoor a domain. In the following, I will refer to domain admin, but in reality, I mean Domain Admins, Enterprise Admins, and Schema Admins.


Ways to backdoor a domain

So here you go, an incomplete list to backdoor a domain:

  • Create a new domain admin user. Easy to do, easy to detect, easy to remediate
  • Dump password hashes. The attacker can either crack those or just pass-the-hash. Since KB2871997, pass-the-hash might be trickier (https://technet.microsoft.com/library/security/2871997), but not impossible. Easy to do, hard to detect, hard to remediate - just think about service user passwords. And during remediation, consider all passwords compromised, even strong ones.
  • Logon scripts - modify the logon scripts and add something malicious in it. Almost anything detailed in this post can be added :D
  • Use an already available account, and add domain admin privileges to that. Reset its password. Mess with current group memberships - e.g. http://www.exploit-db.com/papers/17167/
  • Backdoor any workstation where domain admins login. While remediating workstations, don't forget to clean the roaming profile. The type of backdoor can use different forms: malware, local admin, password (hidden admin with 500 RID), sticky keys, etc.
  • Backdoor any domain controller server. For advanced attacks, see Skeleton keys 
  • Backdoor files on network shares which are commonly used by domain admins by adding malware to commonly used executables - Backdoor factory
  • Change ownership/permissions on AD partitions - if you have particular details on how to do this specifically, please comment
  • Create a new domain user. Hide admin privileges with SID history. Easy to do, hard to detect, easy to remediate - check Mimikatz experimental for addsid
  • Golden tickets - easy to do, hard to detect, medium remediation
  • Silver tickets - easy to do, hard to detect, medium/hard remediation
  • Backdoor workstations/servers via group policy
    • HKEY_LOCAL_MACHINE\ Software\ Microsoft\ Windows\ CurrentVersion\ RunOnce,
    • scheduled tasks (run task 2 years later),
    • sticky-keys with debug
  • Backdoor patch management tool, see slides here
[Update 2017.01.10]


Other tricks

The following list does not fit in the previous "instant admin" tips, but still, it can make the attackers life easier if their primary foothold has been disabled:

  • Backdoor recent backups - and when the backdoor is needed, destroy the files, so the files will be restored from the backdoored backup
  • Backdoor the Exchange server - get a copy of emails
  • Backdoor workstation/server golden image
  • Change permission of logon scripts to allow modification later
  • Place malicious symlinks to file shares, collect hashes via SMB auth tries on specified IP address, grab password hashes later
  • Backdoor remote admin management e.g. HP iLO - e.g. create new user or steal current password
  • Backdoor files e.g. on shares to use in SMB relay
  • Backdoor source code of in-house-developed software
  • Use any type of sniffed or reused passwords in new attacks, e.g. network admin, firewall admin, VPN admin, AV admin, etc.
  • Change the content of the proxy pac file (change browser configuration if necessary), including special exception(s) for a chosen domain(s)  to use proxy on malicious IP. Redirect the traffic, enforce authentication, grab password hashes, ???, profit.
  • Create high privileged users in applications running with high privileges, e.g. MSSQL, Tomcat, and own the machine, impersonate users, grab their credentials, etc. The typical pentest path made easy.
  • Remove patches from servers, change patch policy not to install those patches.
  • Steal Windows root/intermediate CA keys
  • Weaken AD security by changing group policy (e.g. re-enabling LM-hashes)
Update [2015-09-27]: I found this great presentation from Jakob Heidelberg. It mentions (at least) the following techniques, it is worth to check these:
  • Microsoft Local Administrator Password Solution
  • Enroll virtual smart card certificates for domain admins

Forensics

If you have been chosen to remediate a network where attackers gained domain admin privileges, well, you have a lot of things to look for :)

I can recommend two tools which can help you during your investigation:

Lessons learned

But guess what, not all of these problems are solved by rebuilding the AD. One has to rebuild all the computers from scratch as well. Which seems quite impossible. When someone is creating a new AD, it is impossible not to migrate some configuration/data/files from the old domain. And whenever this happens, there is a risk that the new AD will be backdoored as well.

Ok, we are doomed, but what can we do? I recommend proper log analysis, analyze trends, and detect strange patterns in your network. Better spend money on these, than on the domain rebuild. And when you find something, do a proper incident response. And good luck!

Ps: Thanks to Andrew, EQ, and Tileo for adding new ideas to this post.

Check out the host backdooring post as well! :)

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Social Engineering Pentest Professional(SEPP) Training Review

Intro:
I recently returned from the new Social Engineering training provided by Social-Engineer.org in the beautiful city of Seattle,WA, a state known for sparkly vampires, music and coffee shop culture.  As many of you reading this article, i also read the authors definitive book Social Engineering- The art of human hacking and routinely perform SE engagements for my clients. When i heard that the author of the aforementioned book was providing training i immediately signed up to get an in person glance at the content provided in the book. However, i was pleasantly surprised to find the course covered so much more then what was presented in the book.

Instructors:



I wasn't aware that there would be more then one instructor and was extremely happy with the content provided by both instructors. Chris and Robin both have a vast amount of knowledge and experience in the realm of social engineering.  Each instructor brought a different angle and use case scenario to the course content. Robin is an FBI agent in charge of behavioral analysis and uses social engineering in his daily life and work to get the results needed to keep our country safe. Chris uses social engineering in his daily work to help keep his clients secure and provides all sorts of free learning material to the information security community through podcasts and online frameworks.



Course Material and Expectation: 
I originally thought that the material covered in class would be a live reiteration of the material covered in Chris's book. However, I couldn't have been more wrong !!  The whole first day was about reading yourself and other people, much of the material was what Robin uses to train FBI agents in eliciting information from possible terrorist threats. Each learning module was based on live demo's, nightly labs, and constant classroom interaction. Each module was in depth and the level of interaction between students was extremely useful and friendly. I would say the instructors had as much fun as the students learning and sharing social techniques and war stories.
The class was heavily made up of ways to elicit personal and confidential information in a way that left the individuatial "Happier for having met you".  Using language, body posture and social truisms as your weapon to gather information, not intended for your ears, but happily leaving the tongue of your target.
Other class activities and materials included an in depth look at micro expressions with labs and free extended learning material going beyond the allotted classroom days.  Also break out sessions which focused on creating Phone and Phishing scripts to effectively raise your rate of success. These sessions were invaluable at learning to use proper language techniques on the phone and in email to obtain your objectives.

Nightly Missions/Labs: 
If you think that you are going to relax at night with a beer. Think again!! You must ensure that your nights are free, as you will be going on missions to gain information from live targets at venues of your choice.  Each night you will have a partner and a mission to gain certain information while making that persons day better then it started.  The information  you are requested to obtain will change each night and if done properly you will notice all of the material in class starting to unfold.. When you get to body language training you will notice which targets are open and when its best to go in for the kill. You will see interactions change based on a persons change in posture and facial expressions. Each day you will take the new techniques you have learned and put them into practice. Each morning you have to report your findings to the class..
During my nightly labs i obtained information such as door codes to secured research facilities, information regarding secret yet to be released projects.  On the lighter side of things i obtained much personal information from my targets along with phone numbers and invitations for further hangouts and events. I made many new friends inside and outside of class.
There were also labs within the confines of the classroom such as games used to solidify your knowledge and tests to figure out what kind of learner you are. Technical labs on the use of information gathering tools and ways to use phone and phishing techniques to your advantage via linguistically and technologically. Essentially the class was about 60% interaction and labs.


Proof it works:
After class i immediately had a phishing and phone based contract at my current employment. I used the email and phone scripts that we created in class with 100% click rate and 100% success in phone elicitation techniques. Gaining full unfettered access to networks through phone and email elicitation and interaction. Although I do generally have a decent SE success rate, my rates on return are now much higher and an understanding of what works and what doesn't, and why are much more refined.


Conclusion and Certification:
I paid for this class out of pocket, including all expenses, hotels, rentals cars and planes etc etc. I would say that the class was worth every penny in which i paid for it. Many extras were given including black hat passes, extended training from notable sources and continued interaction from instructors after class ended. I would highly recommend this class to anyone looking for a solid foundation in social engineering or a non technical alternative to training.  You will learn a lot, push yourself in new ways and have a blast doing it. However I did not see any sparkly vampires while in seattle.... Twilight lied to me LOL
The certification is a 48 hour test in which you will utilize your knowledge gained technologically and socially to breach a company.I am not going to give away to much information about the certification as i haven't taken it yet and I do not want to misspeak on the subject. However I will say that social-engineer.org has done an excellent job at figuring out a way to include Real World Social Engineering into a test with verifiable proof of results. I am going to take my test in a couple weeks and it should be a blast!!!

Thanks and I hope this review is helpful to all those looking for SE training.  I had a blast :) :)Read more

Networking | Switching And Routing | Tutorial 3 | 2018


Welcome to my 3rd new tutorial of networking (Routing and Switching). In this blog you will able to watch an interesting video about basic device navigation such as changing device (router or switch) name, configuration of login password, configuring a device information, router IP addresses and many more.

What is router?

Router is a network layer device which is the 3rd layer in the OSI model which is used to communicate different networks. It is an intelligent device fixed at the boundary of network that connects to other networks and responsible for end to end delivery of the packet that requires an IP address which is known as the logical address which is the basic identity of the device just like our identity card number or roll number and so on, for the identification of source and destination devices. Router is the gateway of the network having two interfaces such as inbound and the outbound interface through which the traffic comes in from different networks and comes out traffic to the different networks.

What is an IP address?

Internet protocol (IP) address is a numeric label given to each and every device in the network for the identification of the device just like our roll numbers in collages, universities which identity each and every student uniquely everywhere. So same concept here, it is a logical address which is used whenever the device want to communicate outside the network that means to another network.

What is Switch?

Switch is basically layer 2 device, which is used to connect two or more than two devices with each other in the same network. It is an intelligent device which doesn't allow the broadcast. It requires Media access control (MAC) address to communicate within the network. Now let's move to the video for further.