Darshan Thummar
@MightyCompletionist
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2,107 detections
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This rule detects bulk enumeration of a company's overview page by monitoring HTTP requests. It triggers an alert if a source IP makes 20 or more requests containing 'company' in the URI within a 30-second window, indicating a potential network scan or reconnaissance activity.
This rule detects web pages served to clients that contain characteristics commonly associated with tech support scams. Specifically, it looks for HTTP responses containing the words "call", "1-800", and "virus" (case-insensitive) in the file data. This combination of keywords suggests an attempt to trick users into calling a fake support number due to a fabricated "virus" infection.
MSHTA HTA Application Download
Suricata
This rule detects the download of an HTML Application (HTA) file that contains the string "<HTA:APPLICATION". HTA files can be used to execute malicious code, often bypassing browser security restrictions. The rule specifically looks for HTTP traffic where the URI contains ".hta" and the file data contains the HTA application tag, indicating a potential attempt to deliver or execute a malicious HTA.
This rule detects the delivery of shellcode via HTTP that contains a NOP sled pattern. The rule specifically looks for a sequence of eight or more '90' (hexadecimal) bytes in the HTTP response body, which is a common indicator of a NOP sled used to prepare for shellcode execution. The detection is focused on traffic flowing from the server to the client over an established HTTP connection.
This rule detects the download of a potential bootkit payload designed to overwrite the Master Boot Record (MBR). It specifically looks for HTTP traffic where the file data contains the byte sequence '|55 AA|' (which corresponds to the MBR signature) within the first 512 bytes and has a total size greater than 500 bytes. This pattern is indicative of malicious software attempting to modify the MBR for persistence or system control.
This rule detects potential JavaScript obfuscation within HTTP responses by looking for the presence of both 'eval(' and 'unescape(' within the first 500 bytes of file data in a client-bound HTTP flow. This combination of functions is often used in malicious JavaScript to hide its true intent and evade detection.
This rule detects attempts to modify the 'Run' key in the Windows Registry remotely over SMB (port 445). The 'Run' key is a common persistence mechanism used by attackers to ensure their malicious code executes every time a user logs in. The rule specifically looks for network traffic on port 445 containing the string 'SOFTWARE\Microsoft\Windows\CurrentVersion\Run', indicating a potential remote registry modification related to startup programs.
This rule detects attempts to access the AWS EC2 Instance Metadata Service (IMDS) by looking for HTTP requests containing the IP address '169.254.169.254' in the URI. This IP address is a well-known link-local address used by AWS instances to retrieve metadata. Such access attempts, especially when originating from an unexpected source or in an unusual context, can indicate a Server-Side Request Forgery (SSRF) vulnerability being exploited.
This rule detects attempts to disable the system firewall via HTTP traffic. It specifically looks for the 'netsh firewall disable' command within the HTTP flow, indicating a potential defense evasion tactic.
This rule detects attempts to modify the remote registry via Server Message Block (SMB) by looking for the strings "winreg" and "RegSetValue" in TCP traffic destined for port 445 on the home network. This activity could indicate an attacker attempting to establish persistence, elevate privileges, or evade defenses by altering system configurations.
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