Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Identifies a risky sign-in to a known O365 landing page followed shortly by the creation of an inbox rule that deletes messages or moves them to junk/trash. This pattern frequently indicates account compromise (e.g., BEC or AiTM) attempting to hide malicious activity.
This rule detects HTTP requests where the 'Host' header matches patterns commonly associated with serverless function domains, specifically AWS Lambda URLs, Azure Websites, and Google Cloud Functions. The rule is designed to identify potential command and control (C2) infrastructure utilizing serverless platforms. It triggers an alert if 10 such requests are observed from a single source IP within a 60-second window.
This rule monitors successful operations related to Azure Traffic Manager within Azure Activity logs. It summarizes the count of such operations by the caller and time, ordered by the most recent activity. This can be used to track administrative actions or changes made to Traffic Manager configurations.
Detects the successful creation or update of an Azure API Management Service. This activity could indicate legitimate administrative actions or, if unexpected, potential unauthorized access or privilege escalation within the Azure environment. Monitoring these events can help identify suspicious configuration changes or resource provisioning by malicious actors.
This rule detects suspicious activity related to Azure Active Directory service principals. It specifically looks for a service principal performing multiple (5 or more within an hour) 'Add service principal', 'Add owner to application', or 'Add permission grant' operations. This pattern could indicate an attacker attempting to escalate privileges or establish persistence within an Azure AD environment by manipulating service principals and application permissions.
This rule detects suspicious Azure AD sign-in activity where a user successfully signs in from multiple unusual cities within a 24-hour period. It specifically looks for sign-ins that are not from a trusted network and are not from a compliant device, aggregating successful sign-ins by UserPrincipalName and IpAddress, and flagging if there are 5 or more distinct cities.
This rule detects potential brute force attacks against Azure AD accounts by identifying users with 10 or more failed sign-in attempts due to invalid credentials within a 5-minute window. It summarizes the failure count and associated IP addresses for each user.
This rule detects potential 'impossible travel' scenarios within Azure AD sign-in logs. It identifies users who successfully sign in to Office 365 from two geographically distant IP addresses within a one-hour window, suggesting a potential compromise or an attempt to bypass security controls.
This rule detects suspicious activity related to Azure Active Directory service principals. It specifically looks for a service principal performing multiple (5 or more within an hour) 'Add service principal', 'Add owner to application', or 'Add permission grant' operations. This pattern could indicate an attacker attempting to escalate privileges or establish persistence within an Azure AD environment by manipulating service principals and application permissions.
This rule detects suspicious application consent activity in Azure AD. It identifies instances where a user successfully grants consent to three or more applications within a one-hour window. This behavior can indicate an adversary attempting to gain access to resources by tricking users into consenting to malicious applications.
Detects named pipe activity with remote access enabled, initiated by JsonVMAccessExtension.exe running as SYSTEM. This may indicate abuse of the Azure VM Access Extension for unauthorized remote access.
Azure REST API Command Execution
Suricata
This rule detects HTTP POST requests to the Azure management API (management.azure.com). A high volume of such requests (20 within 10 seconds from the same source) could indicate automated activity, potentially related to command execution or resource manipulation within an Azure environment.
This rule detects HTTP traffic directed to 'management.azure.com' with a URI containing 'runCommand'. This pattern indicates an attempt to execute a command on an Azure Virtual Machine using the Azure Run Command feature. This activity is often associated with administrative actions or potential malicious execution on cloud resources.
This rule detects HTTP POST requests to Azure Function or Azure Website domains. It specifically looks for hostnames ending in '.azurewebsites.net' or containing '.azurefunctions.' in a case-insensitive manner. A threshold of 20 such requests from the same source within 60 seconds triggers the alert, indicating potential automated activity or remote execution attempts against Azure-hosted applications.
Detects OAuth bearer tokens being reused from unexpected IP addresses
This rule detects large HTTP PUT requests (over 50KB) directed towards common cloud storage services (Amazon S3, Azure Blob Storage, Google Cloud Storage). This activity could indicate data exfiltration to an external cloud account.
This rule detects attempts to stage large amounts of data (over 65KB) to common cloud storage services (Amazon S3, Azure Blob Storage, Google Cloud Storage) via HTTP PUT requests. This activity is indicative of data being prepared for exfiltration.
This rule detects a high volume of HTTP GET requests to Azure Blob Storage, specifically targeting '.blob.core.windows.net' domains. A threshold of 50 requests within 60 seconds from a single source IP address triggers the alert, indicating a potential bulk data download activity. This could be indicative of data exfiltration or unauthorized access to cloud storage.
This rule detects repeated HTTP requests to 'management.azure.com' with the URI '/resources', indicating an attempt to enumerate Azure resource groups. The threshold of 10 requests within 30 seconds from the same source is set to identify potential scanning or reconnaissance activities.
This rule detects potential file inclusion attempts by monitoring IIS web server logs for URI queries containing keywords like 'file=', 'path=', or 'input='. It then aggregates these attempts by client IP address over one-hour intervals and alerts if 10 or more such attempts are observed from a single IP within that timeframe, indicating a possible attack.
This rule detects attempts to access sensitive configuration or backup files on an IIS web server. It looks for requests where the URI stem contains keywords like '.env', 'config', or 'backup', which are commonly associated with files that may contain sensitive information.
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