The Blue Team PowerShell Security Package

Using Microsoft Teams for Alerts Instead of Email

If you wish to use Microsoft Teams for sending alerts instead of using email you will want to load the microsoft-teams branch for this repository which has the Teams alert modifications. It will take me a little while to implement this as a configuration option in the install script. Using Microsoft Teams for alert posts does not remove the need for certain email notifications in this repository. Email will still be used for some of the actions. These Teams Posts are able to be completed after you first create a webhook. So-called webhooks offer the possibility to send alerts or other notifications to a Microsoft Teams channel. I personally still prefer emails after using this message because they are easier to sort through, in my opinion.

• Microsoft Documentation to create a Webhook
• Microsoft Documentation on Using Webhooks

You can create a webhook using the following steps (if you are an admin)

1. Open the Microsoft Teams application
2. In the left hand pane click "Teams"
3. Click the more options icon represented by 3 dots "..." next to one of the desired Teams Channels. Example Channel Name: General
4. Clicking those 3 dots will display a dropdown menu. Click "Connectors"
5. Click the "Add" button next to "Incoming Webhook"
6. Click "Add" on the Incoming Webhook pop up screen
7. On the Incoming Webhook screen perform the following actions a. Define a name for your webhook. In the below image this value is "PowerShell-TeamsMessagePost" b. Click "Create" c. Optionally you can also use "Upload Image" to select an image for the Incoming Webhook. In the below image I left the default icon which is the light blue triangle on white background. d. Click "Create"
8. The Incoming Webhook URL is created. Copy the URL and click "Done"

You can now use the above URL in the B.T.P.S Security Package scripts I provide. You can quickly update the value in the scripts by executing the below commands

$WebHook = Read-Host -Prompt "Paster your Webhook URL here: "
$SIEM = Read-Host -Prompt "If you have a SIEM in your environment enter the link here: "
$BTPSHome = Read-Host -Prompt "Where did you save the BTPS Security Pacakge git repo? EXAMPLE: C:\Users\Administrator\Downloads\BTPS-SecPack-microsoft-teams"
$Files = (Get-ChildItem -Path $BTPSHome -Include "AttemptedPasswordChange.ps1","AttemptedPasswordReset.ps1","Failed.Username.and.Password.ps1","User.Account.Created.ps1 ","User.Account.Locked.ps1","User.Account.Unlocked.ps1","DNSZoneTransferAlert.ps1","NewComputerAlert.ps1","Query-InsecureLDAPBinds.ps1","UnusualUserSignInAlert.ps1","Watch-PortScan.ps1 " -Recurse -ErrorAction SilentlyContinue -Force).FullName
ForEach ($File in $Files) {

    ((Get-Content -Path $File -Raw) -Replace "WEBHOOK_URL_REPLACE","$WebHook") | Set-Content -Path $File -Force
    ((Get-Content -Path $File -Raw) -Replace "SIEM TOOL LINK","$SIEM") | Set-Content -Path $File -Force

}  # End ForEach

You alert in Microsoft Teams will something look like this

CONTRIBUTE TO THE PROJECT

If you wish to help contribute to the contents of this project feel free to reach out to me at [email protected] with your thoughts and ideas. For more general information on this feel free to refer to the CONTRIBUTING documentation.

DONATIONS

If you wish to donate to this project to help me keep a nice looking site for the documentation your donations will be graciously accepted.
SEND ETHERUM TO : 0xBeDbCfA5366fF1187957BB3ed8811c51B4dBe4D4

The B.T.P.S. Sec Pack

This repo contains a collection of PowerShell tools that can be utilized to protect defend an environment based Microsoft's recommendations.
This repo also assumes that you have referenced the Windows Event Logging Cheat Sheet for logging in your environment. Use LOG-MD or CIS-CAT to ensure the recommended logging is configured.

Installer.ps1

I wrote an initial install script to automatically set up as much of these protections automatically as possible. Most of these scripts are email alerts. When running Installer.ps1 you will be questioned on how you want to authenticate to your SMTP server. This can be done through the use of a credential file or using IP address authentication. This script should be run on a domain controller as this is where many of the alerts are located. I would suggest using WinRM over HTTPS in your environment. I have a video and setup instructions for WinRM over HTTPS on this projects site HERE. This script will let you know if LDAP over SSL is being utilized in your environment. If you wish to configure LDAP over SSL in your environment, which I highly recommend, I did a video on how to do this safely and securely HERE. The Installer.ps1 scritp will help you set up each section of this package with pauses in the script that wait on you to complete a task if one is needed. One such wait for example is for you to set up a group policy to be pushed out. After being run the majority of the below protections will be applied to your environment. The "Unusual Sign In Alert" will require you to modify the UserComputerList.csv file so it contains contents on what users are expected to be signing into what devices in your environment.

What Protections Are Included After Running Installer.ps1?

• Canary Executable Decoys I have included a few executable files that an attacker may not be able to resist executing. These executable files are fake binaries that print the help message of the original executable file to make it seem like the file is legitimate upon execution. These executable files are meant to be uploaded to Canary Tokens which will send you an email alert whenever the file is executed. Instructions on this can be viewed HERE
• RemediateCompromisedOfficeAccount.ps1 VIEW is used to respond to a user whose Office365 password has been comrpomised. This will Reset password (which kills the session). Remove mailbox delegates. Remove mailforwarding rules to external domains. Remove global mailforwarding property on mailbox. Set password complexity on the account to be high. Enable mailbox auditing. Produce Audit Log for the admin to review.
• Account and Password Alerts VIEW
  • Receive alerts when an account is expiring in 2 weeks or less
  • Receive alert containing a table of all users whose passwords are expiring in two weeks or less
  • Receive an alert when a user attempts to change their password
  • Receive an alert when one account attempts to change the password of another account
  • Receive an alert when an account fails to logon to a server
  • Receive an alert when a new user account is created
  • Receive an alert when a user account is locked out
  • Receive an alert when a user account has been unlocked
  • Receive an alert when administrator credentials are used to execute a process with elevated privileges. This is really only meant to monitor users who may have been given administrator credentials against IT's recommendations. It can be used to monitor an administrator for malicious activity as well if desired. Chances are you will not need to implement MonitorAdminEscalation.ps1
• AutoRunsToWinEvent ORIGINAL VIEW
  • This basically takes creates an event log entry in event viewer containig AutoRuns hashes. I am not the author of this. I am only including this in the package as it is an important thing to keep track of
• Device Discovery VIEW
  • Receive an alert any time a device that has never been connected to your network before receives an IP address from one of your DHCP servers.
• Event Alerts VIEW
  • Receive an alert when a DNS Zone Transfer occurs
  • Receive an alert when a new service is installed on a device that is not a Windows Defender upgrade
  • Receive an alert when a new computer is joined to the domain
  • Receive an alert when an insecure LDAP bind occurs (When Bind is not LDAP over SSL)
  • Receive an alert when a user signs into a device they were not assigned
• Hardening Cmdlets VIEW
  • Receive daily information on Azure sign ins for your users
  • Disable weak TLS and SSL protocols on a Client or IIS Server
  • Enable DNS over HTTPS when available
  • Enable HSTS on a local IIS Server
  • Fix any service paths that contain spaces in the directory names but no quotations used to prevent the execution of injected payloads
  • Uninstall PowerShell version 2 from a remote or local machine(s)
  • Remove an email reported as spam from all inboxes that receive the email
  • Rotate the Kerberos keys used in an online exchange environment
  • Enable or Disable SMB signing on a device as well as disable or enable SMBv1 or SMBv2 and SMBv3
  • Enable RDP Network Level Authentication to prevent not domain computers from RDPing into a client
  • Update any available driver updates on a local or remote machine
  • Add a notification banner to emails that users receive in Outlook when the sender name matches a name in the company and the email address is not from the internal domain
  • Create Transport Rule that enables Microsoft Exchange servers to reject failed DMARC email messages
• Local Port Scan Monitor VIEW
  • Receive an alert when a port scan is detected on a local device
  • Receive an alert for when a bind shell is opened and keep a record of all established connections to a device including the port and protocols used
• Sysmon VIEW
  • Enable Sysmon loggging in an environment using a default customized sysmon configuration file
  • Use WHOIS domain lookup to discover domains that were connected to less than 2 years old and receive an alert when a client connection happens
  • Perform a blacklist check on IP addresses that were connected too and receive alerts when a client connection happens
  • Perform a hash validation on Windows processes to discover MD5 hashes that Virus Total returns results on
• WEF Application VIEW
  • Configure Windows Event Forwarding to collect events that are clear indications of compromise
  • Receive alerts when the Centralized Windows Event Collector logs any indicators of compromise
  • View the log files inside an application to prevent needing to sign into the server to view the collected alerts
• Windows Update Cmdlets VIEW
  • Cmdlets that can be used to install all available windows updates
  • Cmdlet that can remove a single KB update that is not updating for whatever reason. Once removed you can use Update-Windows to reinstall the issued update.
• Import-ScheduledTask VIEW
  • This is a cmdlet I am going to be using when I complete the Install.ps1 file that can be used to configure all of the above. For now use the READMEs I have provided to install the desired functionalitys.