Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects attempts to create or modify email forwarding rules in Office 365 via the Microsoft Graph API. Specifically, it looks for HTTP POST requests to the '/mailFolders/inbox/messageRules' endpoint on 'graph.microsoft.com'. This activity can indicate an attacker setting up an inbox rule to forward emails to an external address for data exfiltration or to maintain persistence.
This rule detects potential email harvesting attempts via Exchange Web Services (EWS). It specifically looks for HTTP requests to the '/EWS/Exchange.asmx' endpoint containing 'FindItem' in the client body, indicating an attempt to enumerate or search for items (like emails) within mailboxes. A threshold is applied to prevent excessive alerts from legitimate, but frequent, EWS activity.
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 HTTP POST requests that contain data resembling a ZIP archive (indicated by 'PK' header) and have a size greater than 50,000 bytes. This pattern is often associated with data exfiltration where collected data is archived before being sent out of the network.
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 a high volume of HTTP GET requests to AWS S3 buckets from a single source IP address within a short timeframe. Specifically, it triggers if more than 50 GET requests are observed within 60 seconds to hosts matching 's3.amazonaws.com' or '.s3.' patterns. This behavior can indicate an attempt to exfiltrate data or perform bulk collection from an S3 bucket.
This rule detects internal lateral movement attempts within a network using remote services. It specifically looks for TCP traffic originating from and destined to the home network, indicating internal communication. A threshold of 10 connections within 30 seconds from the same source IP is used to identify suspicious activity, suggesting a potential brute-force or rapid connection attempt indicative of lateral movement.
This rule detects attempts to query the Windows Registry via a web shell for system reconnaissance purposes. It specifically looks for HTTP requests containing the string "reg query" in the URI, indicating a command execution attempt to gather system information.
This rule detects attempts to enumerate remote registry keys via SMB. It specifically looks for network traffic on port 445 (SMB) containing the strings "winreg" and "RegQueryValue" in a case-insensitive manner. A threshold is applied to trigger an alert if 20 such events occur within a 30-second window from the same source.
This rule detects AWS IAM user account enumeration attempts via the ListUsers API call. It triggers when five or more HTTP requests to 'iam.amazonaws.com' containing 'ListUsers' in the URI are observed from a single source IP within a 30-second window. This behavior is indicative of an attacker trying to discover valid IAM user accounts.
This rule detects attempts to enumerate email accounts using Exchange Web Services (EWS). It specifically looks for HTTP requests to the '/EWS/Exchange.asmx' URI containing the 'FindItem' content in the client body. A threshold of 10 such requests within 30 seconds from the same source IP triggers the alert, indicating a potential network scan or discovery activity targeting email accounts.
This rule detects attempts to enumerate the 'Domain Admins' group over SMB (Server Message Block) using the 'NetGroupGetUsers' function. This activity is often associated with reconnaissance by attackers trying to identify high-privilege accounts within a Windows domain.
This rule detects attempts to enumerate local administrator groups via a web shell. It specifically looks for HTTP requests containing the string "net localgroup" in the URI, which is a common command used to list local groups on a Windows system. The detection is case-insensitive and targets established HTTP connections from any source to the home network.
This rule detects attempts to enumerate local group memberships on a target system via the Server Message Block (SMB) protocol. Specifically, it looks for the 'NetLocalGroupEnum' function call within SMB traffic directed to the home network on port 445. This activity is often associated with reconnaissance phases of an attack, where an adversary is trying to discover local user groups to identify potential targets for privilege escalation or lateral movement.
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 multiple AWS console login attempts from a single source IP address within a short timeframe, specifically looking for access to the 'home' URI on 'console.aws.amazon.com'. This behavior could indicate an attacker attempting to discover cloud resources after gaining initial access to an AWS account.
This rule detects network traffic (specifically HTTP responses) that contains strings indicative of malware attempting to detect the presence of a hypervisor. It looks for the string "GetSystemFirmwareTable" and "VBOX" (case-insensitive) within the file data of the HTTP response. This combination suggests a malware payload checking if it's running in a virtualized environment, specifically VirtualBox, which is a common anti-analysis technique.
This rule detects attempts to enumerate device drivers on a system via a web shell. It specifically looks for HTTP requests containing the string "driverquery" in the URI, which is a command-line utility on Windows systems used to display a list of installed device drivers and their properties. The detection is case-insensitive and targets established HTTP connections to the server.
This rule detects attempts to enumerate AWS S3 object lists, which could indicate data discovery activities. It specifically looks for HTTP requests to s3.amazonaws.com or .s3-website domains containing the string 'list' in the URI, with a threshold of 10 occurrences within 30 seconds from the same source.
This rule detects attempts to query system language and locale information via a web shell. It specifically looks for HTTP requests where the URI contains the case-insensitive string "systeminfo". This activity is indicative of an attacker using a web shell to gather reconnaissance about the compromised system's configuration.
This rule detects attempts to query system geographic location information by monitoring HTTP requests to known IP lookup services such as ip-api.com, ipinfo.io, and freegeoip. The rule triggers an alert if five or more such requests are observed from the same source within a 30-second window, indicating potential reconnaissance or network scanning activity.
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