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
- Assign SeEnableDelegationPrivilege to a user
- Directory Service Restore Mode (DSRM)
- Malicious Security Support Provider (SSP)
- DSRMv2
- AdminSDHolder
- Edit GPO
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)
- Microsoft Local Administrator Password Solution
- Enroll virtual smart card certificates for domain admins
Forensics
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!
Check out the host backdooring post as well! :)
- Hacking Tools 2019
- Pentest Tools For Android
- Pentest Tools For Mac
- Best Hacking Tools 2020
- Best Pentesting Tools 2018
- Pentest Tools For Windows
- Ethical Hacker Tools
- Hacking Tools Name
- Pentest Tools Subdomain
- Hacker Tools Mac
- Hacking Tools Usb
- Hackrf Tools
- Game Hacking
- Hacking Tools For Mac
- Hacking Tools For Windows
- Hack Tools
- Game Hacking
- New Hack Tools
- How To Make Hacking Tools
- Pentest Tools Port Scanner
- Tools 4 Hack
- Hack Tools
- Pentest Tools Website
- Pentest Tools Port Scanner
- Pentest Tools Tcp Port Scanner
- Pentest Tools Find Subdomains
- Hacking Tools Mac
- Pentest Tools Find Subdomains
- Pentest Tools Website Vulnerability
- Hack Tools Pc
- Pentest Tools Bluekeep
- How To Install Pentest Tools In Ubuntu
- Underground Hacker Sites
- Hacker Hardware Tools
- Hacker Tools Mac
- Blackhat Hacker Tools
- Hacking App
- Hackrf Tools
- Github Hacking Tools
- Hack Tools Mac
- Hacker Tool Kit
- Pentest Tools For Ubuntu
- Hacking Tools For Windows 7
- Hacks And Tools
- Pentest Tools For Ubuntu
- Hacking Tools Kit
- Hackers Toolbox
- Pentest Tools For Ubuntu
- Hacker Tools Linux
- Pentest Tools Framework
- Kik Hack Tools
- Pentest Tools For Windows
- Hacker Tools For Pc
- Hacking Tools Download
- Hack Tools
- Hacks And Tools
- Blackhat Hacker Tools
- Hack Tools For Windows
- Hacker Tools Software
- Hacking Apps
- Hacking Tools Github
- Android Hack Tools Github
- Install Pentest Tools Ubuntu
- Pentest Tools Alternative
- Tools 4 Hack
- Hacking Tools Windows 10
- Hacking Tools And Software
- Hacking Tools Github
- Free Pentest Tools For Windows
- Hack Tool Apk
- Hacker Tools Free Download
- How To Make Hacking Tools
- New Hacker Tools
- Hacker
- Pentest Tools Framework
- Pentest Tools Find Subdomains
- Hacker Tools List
- Nsa Hack Tools
- Hacking Tools For Windows
- Hacking Tools Github
- Hacker Tools Mac
- Hacker Tools Online
- Hacker Tools Apk
- Hacking Tools Pc
- Hackers Toolbox
- Pentest Tools Framework
- Pentest Tools Online
- Hack Tools Github
- Hacking Tools Name
- Hacker Tools Linux
- Hacker Techniques Tools And Incident Handling
- Hacker Tools List
- Usb Pentest Tools
- Pentest Box Tools Download
- Pentest Tools
- Hacking Tools Mac
- Install Pentest Tools Ubuntu
- Hacker Tools For Mac
- Hack Tools For Mac
- Hacking Tools For Mac
- Hacking Tools Online
- Hacking Tools
- Pentest Tools Bluekeep
- Hacking Tools Pc
- Top Pentest Tools
- Hacker Tools Online
- Hacking Tools Software
- New Hack Tools
- Pentest Tools Find Subdomains
- Pentest Tools Linux
- Hack Tools Download
- Hack Website Online Tool
- Hack Tools Online
- Hacking Tools Online
- Hack Tools For Windows
- Pentest Tools Framework
- Hacker Tools Software
- Install Pentest Tools Ubuntu
- Pentest Tools For Mac
- Hacker Tools For Pc
- World No 1 Hacker Software
- Hacking Tools Name
- Hacking Tools Windows
No comments:
Post a Comment