Darshan Thummar
@MightyCompletionist
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This rule detects DNS queries for TXT records that contain specific patterns indicative of DNS calculation C2 (Command and Control) activity. The pattern searched for is a PCRE regex matching two alphanumeric strings, each 4 to 8 characters long, separated by a dot (e.g., 'abcd.efgh.'). This type of activity is often associated with malware using DNS TXT records to encode C2 instructions or data, potentially involving IP math for dynamic C2 server resolution. The rule includes a threshold to prevent excessive alerts, triggering if 5 such queries are observed from the same source within 60 seconds.
This rule detects potential callback activity from a remote hardware implant. It specifically looks for HTTP requests where the URI contains common callback patterns like '/callback', '/checkin', '/ping', or '/heartbeat', and the User-Agent header indicates a scripting tool such as 'python', 'curl', or 'wget'. The rule also specifies that the HTTP body size should be between 1 and 199 bytes, and it uses a threshold to trigger an alert if 10 such events occur within 60 seconds from the same source.
This rule detects potential data staging activity on a remote SMB share. It specifically looks for traffic to port 445 (SMB) containing 'ADMIN$' (case-insensitive) with a data size greater than 65000 bytes. A threshold of 20 such events within 60 seconds from the same source IP will trigger an alert, indicating a high volume of data being transferred to an administrative share, which could precede exfiltration.
This rule detects potential RDP session hijacking attempts by looking for the string "tscon" within TCP traffic destined for port 3389 (RDP). The 'tscon' command can be used to connect to or take control of another user's RDP session.
This rule detects the planting of script files, specifically PowerShell scripts (.ps1), on shared network drives. It looks for SMB traffic directed to a server on port 445 (SMB) that contains both the string ".ps1" (case-insensitive) and the string "\\share\\" (case-insensitive). This activity is indicative of an attacker staging scripts on a network share for potential lateral movement within a network.
This rule detects a high volume of HTTP requests to the Confluence REST API endpoint '/rest/api/content'. This pattern of access could indicate an attempt to bulk download content from Confluence spaces, potentially for data exfiltration or reconnaissance purposes. The threshold is set to trigger if 30 such requests are observed from a single source IP within a 60-second window.
This rule detects a high volume of HTTP requests to a Confluence Wiki instance that include both '/wiki/' and 'export' in the URI. Specifically, it triggers if 10 such requests are observed from the same source IP within a 60-second window. This behavior could indicate an attempt to bulk export pages from a Confluence Wiki, potentially for data exfiltration.
This rule detects bulk data access from an internal information repository. It triggers when a single source IP address performs 50 or more HTTP GET requests within a 30-second window to any destination. This behavior could indicate an attempt to exfiltrate or rapidly collect large amounts of data from internal web-based resources.
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.
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