Darshan Thummar
@MightyCompletionist
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This rule detects attempts to manipulate application runtime memory via web shell activity. Specifically, it looks for HTTP requests where the URI content contains the string "WriteProcessMemory" (case-insensitive). This string is indicative of an attempt to use a function commonly associated with injecting code or modifying the memory of a running process, often a technique employed by web shells to achieve persistence or execute arbitrary code.
This rule detects attempts to modify stored data within a MySQL database, specifically looking for 'UPDATE' and 'WHERE' clauses in TCP traffic directed to the MySQL default port (3306). It triggers an alert if 50 such events are observed from the same source IP within a 30-second window, indicating potential malicious activity aimed at data integrity compromise.
This rule detects potential command and control (C2) activity where commands are being read from a removable media share over SMB. It specifically looks for SMB traffic containing the string "USBSTOR" (case-insensitive) and ".txt" (case-insensitive), indicating access to text files on a USB storage device. A threshold of 5 occurrences within 30 seconds from the same source IP is applied to reduce false positives.
This rule detects the use of an external proxy service to mask Command and Control (C2) origin. It specifically looks for HTTP traffic where the 'X-Forwarded-For' header is present and the HTTP method is 'CONNECT'. A threshold of 10 occurrences within 60 seconds from the same source IP is applied to reduce false positives.
This rule detects the use of an internal proxy server to route C2 (Command and Control) traffic. Specifically, it looks for HTTP CONNECT requests within the internal network ($HOME_NET to $HOME_NET) that are established and occur at a high frequency (10 times in 60 seconds from the same source). This pattern is indicative of a system inside the network attempting to tunnel C2 communications through an internal proxy.
This rule detects a potential FTP C2 (Command and Control) channel exhibiting a regular beaconing pattern. It triggers an alert if 10 or more TCP connections are made to port 21 (FTP) from a single source IP address within a 300-second window, indicating established communication from the internal network to an external FTP server. This behavior is characteristic of malware using FTP for C2 communications.
This rule detects non-HTTP traffic being tunneled over TCP port 80. It specifically looks for established TCP connections to port 80 where the application layer protocol is not identified as HTTP and the data payload size is greater than 100 bytes. A threshold is applied to trigger an alert if 10 such events occur from the same source IP within 60 seconds. This behavior is often indicative of command and control (C2) communication or data exfiltration attempting to blend in with legitimate web traffic.
This rule detects a high volume of DNS NXDOMAIN (Non-Existent Domain) responses originating from a single source IP address within a short timeframe. This pattern is indicative of Domain Generation Algorithm (DGA) activity, often used by malware for command and control (C2) beaconing. The threshold is set to trigger if 20 NXDOMAIN responses are observed from the same source within 60 seconds.
This rule detects HTTP POST requests to 'management.azure.com' with a URI containing 'bastionHosts'. This pattern indicates an attempt to establish a direct VM connection via Azure Bastion, which could be used for lateral movement within an Azure environment.
This rule detects network traffic on TCP port 3333, which is commonly associated with the Stratum protocol used in cryptocurrency mining. The rule specifically looks for the initiation of a TCP connection (SYN flag) to this port from the home network to any destination. This activity could indicate the presence of cryptomining malware or unauthorized cryptomining operations within the network.
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