Azure Sentinel
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'Query for new sign-ins from stale/inactive accounts. UEBA filters based on ActivityInsights. Results for accounts created in the last 7 days are filtered out.'
This query identifies common processes run by ransomware
malware to destroy volume shadow copies or clean free
space on a drive to prevent a file from being recovered
post-encryption. To reduce false positives, results are
filtered to only actions taken when the initiating
process was launched from a suspicious directory. If
you don't mind false positives, consider removing the
last where clause.
Special thanks to Captain for additional inputs
malware to destroy volume shadow copies or clean free
space on a drive to prevent a file from being recovered
post-encryption. To reduce false positives, results are
filtered to only actions taken when the initiating
process was launched from a suspicious directory. If
you don't mind false positives, consider removing the
last where clause.
Special thanks to Captain for additional inputs
'Identifies a match across various data feeds for domains, hashes and IP IOC related to Mercury
Reference: https://www.microsoft.com/security/blog/2022/08/25/mercury-leveraging-log4j-2-vulnerabilities-in-unpatched-systems-to-target-israeli-organizations/'
Reference: https://www.microsoft.com/security/blog/2022/08/25/mercury-leveraging-log4j-2-vulnerabilities-in-unpatched-systems-to-target-israeli-organizations/'
"This query searches for any action type with high frequency that involves adding, modifying, or removing something in cloud app policies. It sees where the properties are modified such that the old value and new value are different for every property except for minor property changes such as Display Name."
This query looks for users performing file deletion activities. Spikes in file deletion observed from risky sign-in sessions are flagged here.
This applies to SharePoint and OneDrive users.
Audit event and Cloud application identifier references.
Reference - https://learn.microsoft.com/microsoft-365/compliance/audit-log-activities?view=o365-worldwide
Reference - https://learn.microsoft.com/azure/sentinel/entities-reference#cloud-application-identifiers
This applies to SharePoint and OneDrive users.
Audit event and Cloud application identifier references.
Reference - https://learn.microsoft.com/microsoft-365/compliance/audit-log-activities?view=o365-worldwide
Reference - https://learn.microsoft.com/azure/sentinel/entities-reference#cloud-application-identifiers
The query looks for users or service principals that attached an uncommon credential type to application.
As part of the Nobelium campaign, the attacker added credentials to already existing applications and used the application permissions to extract users' mails.
See How to: Use the portal to create an Microsoft Entra ID application and service principal that can access resources.
Reference - https://docs.microsoft.com/azure/active-directory/develop/howto-create-service-principal-portal
As part of the Nobelium campaign, the attacker added credentials to already existing applications and used the application permissions to extract users' mails.
See How to: Use the portal to create an Microsoft Entra ID application and service principal that can access resources.
Reference - https://docs.microsoft.com/azure/active-directory/develop/howto-create-service-principal-portal
Remote Monitoring and Management (RMM) programs are IT to manage remote endpoints. Attackers have begun to abuse these programs to persist or provide C2 channels.
https://github.com/jischell-msft/RemoteManagementMonitoringTools
https://github.com/jischell-msft/RemoteManagementMonitoringTools
Looks for a logon domain in the Microsoft Entra ID logs, encoded with the same DGA encoding used in the Nobelium campaign.
See Important steps for customers to protect themselves from recent nation-state cyberattacks for more on the Nobelium campaign (formerly known as Solorigate).
This query is inspired by an Azure Sentinel detection.
References:
https://blogs.microsoft.com/on-the-issues/2020/12/13/customers-protect-nation-state-cyberattacks/
https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Hunting%20Queries/DnsEvents/Solorigate-Encoded-Domain-URL.yaml
See Important steps for customers to protect themselves from recent nation-state cyberattacks for more on the Nobelium campaign (formerly known as Solorigate).
This query is inspired by an Azure Sentinel detection.
References:
https://blogs.microsoft.com/on-the-issues/2020/12/13/customers-protect-nation-state-cyberattacks/
https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Hunting%20Queries/DnsEvents/Solorigate-Encoded-Domain-URL.yaml
'Finds instances where a file uploaded to blob or file storage and it is seen on an endpoint by Microsoft Defender XDR.'
Query for SmartScreen application blocks on files with "Malicious" reputation, where the user has decided to run the malware nontheless.
Read more about SmartScreen here: https://docs.microsoft.com/windows/security/threat-protection/windows-defender-smartscreen/windows-defender-smartscreen-overview.
Data availability: These events are available only on Windows 10 version 1703 and onwards.
Tags: #SmartScreen.
Read more about SmartScreen here: https://docs.microsoft.com/windows/security/threat-protection/windows-defender-smartscreen/windows-defender-smartscreen-overview.
Data availability: These events are available only on Windows 10 version 1703 and onwards.
Tags: #SmartScreen.
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