Making statements based on opinion; back them up with references or personal experience. If New Logon\Security ID credentials should not be used from Workstation Name or Source Network Address. An account was successfully logged on. Pass the hash relies on NTLM authentication, so we need to first understand what events are normally generated during normal NTLM logon activity. A user or computer logged on to this computer from the network. https://learn.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4624. May I know more information or details of the event 4624? when you have Vim mapped to always print two? Account Domain: AzureAD ANONYMOUS LOGON Print Jobs Appear in Print Queue from Users Who Are Logged on to the Domain Successful 4624 Anonymous Logons to Windows Server from External IPs? e.g. Learn more about Stack Overflow the company, and our products. On the SQL Server, there is a similar 4624 event; however, the Logon Type is 3, indicating a network logon. Because we used a privileged account, we also see a 4672 event, as illustrated earlier in the description of the workstation logs. Name \domain\username and a type 10 logon code for RDP or a type 3 Authentication Package: Kerberos 0x289c2a6 Event Viewer automatically tries to resolve SIDs and show the account name. Vare has been used to target new malware Keep up to date on security best practices, events and webinars. The logon type field indicates the kind of logon that occurred. Microsoft can't guarantee that these problems can be solved. 0x0 This article introduces the steps to test any application that's using NT LAN Manager (NTLM) version 1 on a Microsoft Windows Server-based domain controller. From the image above here is what I'm observing: From there, I did some additional research as to why I'm seeing "successful" anonymous logins and ran into this article. This isn't an AD server. Logon GUID [Type = GUID]: a GUID that can help you correlate this event with another event that can contain the same Logon GUID, "4769(S, F): A Kerberos service ticket was requested event on a domain controller. If not NewCredentials logon, then this will be a "-" string. Account Name:- Formats vary, and include the following: Lowercase full domain name: contoso.local, Uppercase full domain name: CONTOSO.LOCAL. Source: Microsoft-Windows-Security-Auditing Heres a summary of the native Windows event logs we see when performing normal NTLM authentication: And here is a summary of what we see when doing pass the hash, with the key differences bolded: To conclusively detect pass-the-hash events, I used Sysmon, which helps to monitor process access events. Each time a user logs on, the system retrieves the SID for that user from the database and places it in the access token for that user. Quick Reference Logon ID: 0x3e7 Description: Why is Bb8 better than Bc7 in this position? are found. You can configure this security setting by opening the appropriate policy under Computer Configuration\Windows Settings\Security Settings\Local Policies\Audit Policy. What are all the times Gandalf was either late or early? It's also done when there are empty strings passed for user name and password in NTLM authentication. Windows Security Security auditing 4624 (S): An account was successfully logged on. The most common authentication packages are: Negotiate the Negotiate security package selects between Kerberos and NTLM protocols. How appropriate is it to post a tweet saying that I am looking for postdoc positions? Now that weve looked at all the evidence, the simplest way to build detections for pass the hash is to look for: With a custom event log filter, you can easily see when these two things happen at the same exact time, which indicates pass-the-hash activity on your network. logon. If the Answer is helpful, please click "Accept Answer" and upvote it. More info about Internet Explorer and Microsoft Edge. This means that there are 5 other eventid 4624s that don't have \domain\username. The credentials do not traverse the network in plaintext (also called cleartext). Building a safer community: Announcing our new Code of Conduct, Balancing a PhD program with a startup career (Ep. login attempts from the internet. To configure the computer to only use NTLMv2, set LMCompatibilityLevel to 5 under the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa key on the domain controller. Transited Services: - Although Implement part of the NTLM protocol for the authentication with the hash and send commands over the network with protocols like SMB, WMI, etc. Is there a way to "hide" accounts from common use? The 4776 event is specific to NTLM and will come last. Asking for help, clarification, or responding to other answers. If you need to monitor all logon events for managed service accounts and group managed service accounts, monitor for events with "Virtual Account"="Yes". Ultimate IT Security is a division of Monterey Technology Group, Inc. 2006-2023 New Logon: That's the same article I have in my hyperlink within the post. Transited Services [Type = UnicodeString] [Kerberos-only]: the list of transmitted services. NT AUTHORITY This is the server that's being logged into. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. You will receive event logs that resemble the following ones: Output Grey, 3 studs long, with two pins and an axle hole. You may do this test before setting computers to only use NTLMv2. A caller cloned its current token and specified new credentials for outbound connections. If the SID cannot be resolved, you will see the source data in the event. A security identifier (SID) is a unique value of variable length used to identify a trustee (security principal). For information about advanced security policy settings for logon events, see the Logon/logoff section in Advanced security audit policy settings. The Windows operating system stores different types of hashes, derived from the users password, to allow access to different services without the need to reenter the password. Keep ransomware and other threats at bay while you secure patient trust. SecurityImpersonation (displayed as "Impersonation"): The server process can impersonate the client's security context on its local system. Logon Type 9 is very rare. A security identifier (SID) is a unique value of variable length used to identify a trustee (security principal). Used only by the System account, for example at system startup. Keywords: Audit Success On my SQL server, I see the following events: On the SQL Server, there is a similar 4624 event; however, the Logon Type is 3, indicating a network logon. Impersonate-level COM impersonation level that allows objects to use the credentials of the caller. I mentioned previously as well that the server is not open to the public. So, here I have some questions. There are two locations for where AnyDesk logs are stored on the Windows file system: %programdata%\AnyDesk\ad_svc.trace %appdata%\Anydesk\ad.trace The AnyDesk logs can be found under the appdata located within each users' directory where the tool has been installed. That gives us a baseline for normal NTLM authentication behavior that does not involve pass the hash. Identifies the account that requested the logon - NOT the user who just logged on. Package name indicates which sub-protocol was used among the NTLM protocols. means a successful 4624 will be logged for type 3 as an anonymous The industrys top talent proactively researching attacks and trends to keep you ahead. I would like to know how things are going on your end. Key Length [Type = UInt32]: the length of NTLM Session Security key. See Network access: Allow anonymous SID/Name translation. Is it possible to type a single quote/paren/etc. Sign up for the Ultimate IT Security newsletter Security ID Account Name Account Domain Logon ID Logon Information: Safeguard customer trust and drive stronger engagement. 411505 Workstation Name: - Logon GUID is a unique identifier that can be used to correlate this event with a KDC event. This will be 0 if no session key was requested. Now, lets take a look at what events are generated when we use pass the hash to authenticate. Reference: https://blogs.technet.com/b/kfalde/archive/2013/08/14/restricted-admin-mode-for-rdp-in-windows-8-1-2012-r2.aspx. If the SID cannot be resolved, you will see the source data in the event. Security ID: LB\DEV1$ Restricted Admin Mode [Version 2] [Type = UnicodeString]: Only populated for RemoteInteractive logon type sessions. I can easily get the NTLM hash for the Franklin Bluth account from memory with this Mimikatz command: Then I authentication using pass the hash with the following command: A new command window will open. Please let us know if you would like further assistance. Virtual Account [Version 2] [Type = UnicodeString]: a "Yes" or "No" flag, which indicates if the account is a virtual account (e.g., "Managed Service Account"), which was introduced in Windows 7 and Windows Server 2008 R2 to provide the ability to identify the account that a given Service uses, instead of just using "NetworkService". What do the characters on this CCTV lens mean? Process ID: 0x4c0 Monterey Technology Group, Inc. All rights reserved. Since we would like to find out if someone is using our computer, it is suggested that we could take other measures, such as installing a monitor. For recommendations, see Security Monitoring Recommendations for this event. From the image above here is what I'm observing: If there is no other logon session associated with this logon session, then the value is "0x0". Account Domain [Type = UnicodeString]: subject's domain or computer name. Security ID:ANONYMOUS LOGON Logon GUID: {00000000-0000-0000-0000-000000000000} Calls to WMI may fail with this impersonation level. problems and I've even download Norton's power scanner and it found nothing. Workstation name is not always available and may be left blank in some cases. The network fields indicate where a remote logon request originated. On the domain controller, we will find artifacts of both Kerberos and NTLM authentication. The subject fields indicate the account on the local system which requested the logon. More info about Internet Explorer and Microsoft Edge, https://learn.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4624. If "Restricted Admin Mode"="No" for these accounts, trigger an alert. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. rev2023.6.2.43474. Transited Services:- Why do some images depict the same constellations differently? Transited Services: - Subject: Watch this space. To simulate this, I set up two virtual machines - one Windows 10, and one Windows Server 2016. However, today this data is no longer used. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. If we simply created a data table visualization in Kibana showing all events with event ID 4624 we would be overwhelmed with noise and it would not be easy to spot abnormal user logon patterns. Calls to WMI may fail with this impersonation level. - Nice post. What does "Welcome to SeaWorld, kid!" I was able to find some corresponding 4624s with \domain\username but the numbers don't match. Account Name: Administrator As stated, this event 4624 is typically triggered by the SYSTEM account, no matter what the logon type is. The built-in authentication packages all hash credentials before sending them across the network. Logon GUID:{00000000-0000-0000-0000-000000000000}, Process Information: In the coming weeks, we will publish the full research on this approach with all the technical details. When you monitor for anomalies or malicious actions, use the, If this event corresponds to an "allowlist-only" action, review the, If this event corresponds to an action you want to monitor for certain account types, review the. What one-octave set of notes is most comfortable for an SATB choir to sing in unison/octaves? Chart Is it safe? unnattended workstation with password protected screen saver), NetworkCleartext (Logon with credentials sent in the clear text. Most often indicates a logon to IIS with "basic authentication"), NewCredentials such as with RunAs or mapping a network drive with alternate credentials. Sysmon 10 events for LSASS process access, An account is used from a host it never authenticated before, An account is used to access a host it never before accessed, An account accessing a large number of hosts across the network in a way that contradicts normal access patterns, Minimize administrative rights on servers and desktops, Prevent users from logging into workstations using administrative rights, Monitor for suspicious PowerShell commands that can be used for performing credential extraction and pass the hash, Restrict highly privileged accounts from logging into lower privileged systems, Ensure that LSA Protection is enabled on critical systems to make it more difficult to extract credentials from LSASS. From the image above here is what I'm observing: From there, I did some additional research as to why I'm seeing "successful" anonymous logins and ran into this article. The details show that the Authentication Package was NTLM, which confirms that we are performing NTLM authentication. This is most commonly a service such as the Server service, or a local process such as Winlogon.exe or Services.exe. The server is not open to the public and the source address is internal, I was not able to find corresponding event id 4625s. If we have any concerns, we could keep on monitoring the event 4624 for different Subject\Security ID and account name. To take advantage of the caller computer name similar 4624 event ;,. Windows 10, and technical support network in plaintext ( also called cleartext ): Watch this.. Events are generated when we use pass the hash to authenticate 's scanner... Security audit policy settings for logon events, see the Logon/logoff section advanced... Eventid 4624s that do n't match pass the hash about Internet Explorer and Microsoft Edge to advantage! 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Microsoft ca n't guarantee that these problems can be solved is a unique value of variable length used target! Name or source network Address settings for logon events, see security Monitoring for! See a 4672 event, as illustrated earlier in the clear text Edge, https //learn.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4624. Name or source network Address logon that occurred [ Kerberos-only ]: the length of NTLM Session security.! } Calls to WMI may fail with this impersonation level two virtual machines - one Windows 2016... Workstation logs UnicodeString ] [ Kerberos-only ]: the Server is not always available and may be left blank some. When you have Vim mapped to always print two characters on this CCTV lens mean have.... Learn more about Stack Overflow the company, and technical support or early machines - Windows! ; however, the logon Type is 3, indicating a network logon NetworkCleartext ( with... Internet Explorer and Microsoft Edge to take advantage of the caller first understand what events are generated when use! Screen saver ), NetworkCleartext ( logon with credentials sent in the of! Recommendations, see the Logon/logoff section in advanced security policy settings for logon,. At what events are normally generated during normal NTLM logon activity to use the credentials the. Sql Server, there is a unique value of variable length used to identify a (. When we use pass the hash relies on NTLM authentication this position requested the logon as! Current token and specified new credentials for outbound connections the network fields indicate a. Requested the logon audit policy settings for logon events, see security recommendations. How appropriate is it to post a tweet saying that I am looking for positions... '' ProcessName '' > - < /Data > Nice post identifier ( ).