Darshan Thummar
@MightyCompletionist
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This rule detects a potential RDP brute force attack by monitoring for a high number of TCP SYN packets directed to port 3389 (RDP) on the home network from a single source IP address within a short timeframe. Specifically, it triggers an alert if 10 or more SYN packets are observed from the same source within 60 seconds, indicating an attempt to establish multiple RDP connections, which is characteristic of a brute force attempt.
This rule detects attempts at path traversal vulnerabilities by looking for the string "../../../" in HTTP URIs. This pattern is commonly used by attackers to navigate directory structures outside of the intended web root.
This rule detects attempts to inject client-side scripts, commonly known as Cross-Site Scripting (XSS), by looking for the string "<script>" within the HTTP URI of network traffic. This is a common indicator of an attacker trying to execute malicious scripts in a user's browser.
This rule detects attempts at SQL Injection by looking for the specific string "' OR '1'='1" within the HTTP URI. This string is a common payload used in SQL injection attacks to bypass authentication or extract data by always evaluating to true.
This rule detects an anomaly in Kerberos Ticket Granting Ticket (TGT) requests. Specifically, it triggers an alert if more than 50 UDP Kerberos TGT requests are observed from a single source IP address within a 10-second window to the home network on port 88. This behavior could indicate an attempt to enumerate valid user accounts or perform credential stuffing/brute-force attacks against the Kerberos authentication system, potentially as part of a privilege escalation attempt (ATT&CK T1134).
This rule detects attempts to modify user accounts via LDAP. It specifically looks for TCP traffic on port 389 (LDAP) containing the hexadecimal representation of '0' (likely part of an LDAP message structure) and the case-insensitive string 'modify'. A threshold of 5 such events within 60 seconds from the same source IP triggers the alert, indicating potential malicious activity related to account manipulation.
This rule detects the presence of a common China Chopper web shell pattern in HTTP client body content. Specifically, it looks for the string "eval(base64_decode(" (case-insensitive) within HTTP requests flowing to the server. This pattern is characteristic of how China Chopper web shells execute commands on compromised web servers.
This rule detects HTTP traffic where the URI contains ".sct" (scriptlet) in a case-insensitive manner. This is indicative of an attempt to download a scriptlet, which can be used by MSHTA (Microsoft HTML Application host) for defense evasion, often to execute malicious code.
This rule detects potential phishing landing pages by looking for HTTP responses that contain both 'login' and 'microsoft' in the URI, and where the HTTP host is an IP address. This combination suggests an attempt to mimic a Microsoft login page hosted on an IP address rather than a legitimate domain, which is a common tactic in phishing attacks.
This rule detects attempts at SQL Injection using the 'UNION SELECT' statement within HTTP URI requests. It specifically looks for the case-insensitive string 'UNION SELECT' in the URI of HTTP traffic flowing to the server.
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