Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects a specific command used by the Conti ransomware group
Detects suspicious parameters of fsutil (deleting USN journal, configuring it with small size, etc).
Might be used by ransomwares during the attack (seen by NotPetya and others).
Might be used by ransomwares during the attack (seen by NotPetya and others).
Detects the invocation of MS SQL transactions that are destructive towards table or database data, such as "DROP TABLE" or "DROP DATABASE".
Stop Windows Service
Sigma
Detects a Windows service to be stopped
In this query, we are looking for emails containing malware accessed on a unmanaged device
Detects command line parameters or strings often used by crypto miners
Detects registry value settings that would replace the user's desktop background.
This is a common technique used by malware to change the desktop background to a ransom note or other image.
This is a common technique used by malware to change the desktop background to a ransom note or other image.
'This query could identify critical user management operations like user registration(Microsoft Entra ID Multi-Factor Authentication & self-service password reset (SSPR)) authentication by admin account followed by attempts to stop System Restore activity. Stopping system restore prevents from recovering data by going back to a restore point. The operations could be an indication of attackers trying to maintain persistence, move laterally with attempts to stop system restore point that could point to a potential ransomware attack.'
'Identifies when a new user is granted access and starts creating resources in Azure. This can help you identify rogue or malicious user behavior.'
'This query combines different SQL alerts with CommonSecurityLogs and AuditLogs helping analysts /investigate any possible SQL related attacks faster
thus reducing Mean Time To Respond'
thus reducing Mean Time To Respond'
'This query combines different Storage alerts with CommonSecurityLogs and AuditLogs helping analysts investigate any possible storage related attacks faster
thus reducing Mean Time To Respond'
thus reducing Mean Time To Respond'
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
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
'Identifies IP addresses that may be performing DNS lookups associated with common currency mining pools.
This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM DNS schema'
This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM DNS schema'
Shadow Copies deletion using operating systems utilities
Detects registry value settings that would replace the user's desktop background.
This is a common technique used by malware to change the desktop background to a ransom note or other image.
This is a common technique used by malware to change the desktop background to a ransom note or other image.
This query was originally published in the threat analytics report, Sysrv botnet evolution.
Sysrv is a Go-based botnet that targets both Windows and Linux servers, and steals resources to mine cryptocurrency.
The following query finds instances of remote code execution on a vulnerable Linux server.
Sysrv is a Go-based botnet that targets both Windows and Linux servers, and steals resources to mine cryptocurrency.
The following query finds instances of remote code execution on a vulnerable Linux server.
'This query looks for unfamiliar Sign-in's thats not seen recently for the given user
with azure portal login attempts and audit logs to help detect and reduce the analysis timeline for defenders'
with azure portal login attempts and audit logs to help detect and reduce the analysis timeline for defenders'
'Looks for multiple users that had their admin role removed by a single user within a certain period.
The default threshold is 5 removals, this can be edited in the query.'
The default threshold is 5 removals, this can be edited in the query.'
This query will find applications that have been granted Mail.Read or Mail.ReadWrite permissions in which the corresponding user recently consented to. It can help identify applications that have been abused to gain access to user email.
The actor, Nobelium, was observed modifying existing tenant application permissions to allow them to read user email through the Microsoft Graph API. See Customer Guidance on Recent Nation-State Cyber Attacks.
This query is insprired by an Azure Sentinel detection.
References:
https://msrc-blog.microsoft.com/2020/12/13/customer-guidance-on-recent-nation-state-cyber-attacks/
https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/MailPermissionsAddedToApplication.yaml
The actor, Nobelium, was observed modifying existing tenant application permissions to allow them to read user email through the Microsoft Graph API. See Customer Guidance on Recent Nation-State Cyber Attacks.
This query is insprired by an Azure Sentinel detection.
References:
https://msrc-blog.microsoft.com/2020/12/13/customer-guidance-on-recent-nation-state-cyber-attacks/
https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/MailPermissionsAddedToApplication.yaml
'This hunting query looks for users who have multiple failed queries in a short space of time.'
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