Azure Sentinel
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'Detects request to potentially harmful file types (.ps1, .bat, .vbs, etc.).'
'Detects when a Guest User is added by a user account that has not been seen adding a guest in the previous 14 days.
Monitoring guest accounts and the access they are provided is important to detect potential account abuse.
Accounts added should be investigated to ensure the activity was legitimate.
Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-user-accounts#monitoring-for-failed-unusual-sign-ins'
Monitoring guest accounts and the access they are provided is important to detect potential account abuse.
Accounts added should be investigated to ensure the activity was legitimate.
Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-user-accounts#monitoring-for-failed-unusual-sign-ins'
'Detects a privileged role being added to a Service Principal.
Ensure that any assignment to a Service Principal is valid and appropriate - Service Principals should not be assigned to very highly privileged roles such as Global Admin.
Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-privileged-accounts#changes-to-privileged-accounts'
Ensure that any assignment to a Service Principal is valid and appropriate - Service Principals should not be assigned to very highly privileged roles such as Global Admin.
Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-privileged-accounts#changes-to-privileged-accounts'
'Entropy calculation used to help identify Hosts where they have a high variety of processes(a high entropy process list on a given Host over time).
This helps us identify rare processes on a given Host. Rare here means a process shows up on the Host relatively few times in the the last 7days.
The Weight is calculated based on the Entropy, Process Count and Distinct Hosts with that Process. The lower the Weight/ProcessEntropy the, more interesting.
The Weight calculation increases the Weight if the process executes more than once on the Host or has executed on more than 1 Hosts.
In general, this should identify processes on a Host that are rare and rare for the environment.
References: https://medium.com/udacity/shannon-entropy-information-gain-and-picking-balls-from-buckets-5810d35d54b4
https://en.wiktionary.org/wiki/Shannon_entropy'
This helps us identify rare processes on a given Host. Rare here means a process shows up on the Host relatively few times in the the last 7days.
The Weight is calculated based on the Entropy, Process Count and Distinct Hosts with that Process. The lower the Weight/ProcessEntropy the, more interesting.
The Weight calculation increases the Weight if the process executes more than once on the Host or has executed on more than 1 Hosts.
In general, this should identify processes on a Host that are rare and rare for the environment.
References: https://medium.com/udacity/shannon-entropy-information-gain-and-picking-balls-from-buckets-5810d35d54b4
https://en.wiktionary.org/wiki/Shannon_entropy'
'Identifies an interrupted sign-in session from a country the user has not sign-in before in the last 7 days, where the password was correct. Although the session is interrupted by other controls such as multi factor authentication or conditional access policies, the user credentials should be reset due to logs indicating a correct password was observed during sign-in.'
Identify accounts that have logged on to affected endpoints.
Check for specific alerts.
Check for specific alerts.
Original Sigma Rule: https://github.com/Neo23x0/sigma/blob/master/rules/apt/apt_judgement_panda_gtr19.yml.
Questions via Twitter: @janvonkirchheim.
Questions via Twitter: @janvonkirchheim.
This query checks devices for the presence of files that have been sent by a known malicious sender. To use this query, replace the email address with the address of the known malicious sender.
Action "PnpDeviceConnected" reports the connection of any plug and play device.
Read more online on event 6416: https://docs.microsoft.com/windows/security/threat-protection/auditing/event-6416.
Query #1: look for rare one-time devices connected to a specific machine.
Read more online on event 6416: https://docs.microsoft.com/windows/security/threat-protection/auditing/event-6416.
Query #1: look for rare one-time devices connected to a specific machine.
Looks for rare process launch as a scheduled task and activity done by the processes.
Author: Jouni Mikkola
More info: https://threathunt.blog/hunting-for-malicious-scheduled-tasks/
Author: Jouni Mikkola
More info: https://threathunt.blog/hunting-for-malicious-scheduled-tasks/
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