Darshan Thummar
@MightyCompletionist
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This rule detects emails sent over SMTP where the 'From:' and 'Reply-To:' headers are present, indicating a potential attempt to spoof the sender's display name while using a different domain. It triggers an alert if 10 such emails are observed from the same source within 60 seconds, suggesting a bulk email or phishing attempt.
This rule detects email spoofing attempts where the 'From' address domain does not match the 'Return-Path' address domain. It specifically looks for SMTP traffic on port 25, ensuring the flow is established and to the server. The rule uses PCRE to extract the domain from the 'From' header and then checks if the 'Return-Path' header contains a different domain.
This rule detects a credential stuffing attack characterized by a high volume of HTTP POST requests to a 'login' URI from a single source IP address within a short timeframe. It specifically looks for HTTP traffic where the method is POST and the URI contains 'login' (case-insensitive). A threshold of 100 such attempts within 60 seconds from the same destination IP address triggers the alert.
This rule detects attempts to read the '/etc/shadow' file via a web shell or similar web-based attack. The rule specifically looks for the string '/etc/shadow' within the HTTP URI, indicating an attempt to access this sensitive file through a web request. This is a common technique used by attackers to exfiltrate credentials after gaining initial access to a web server.
This rule detects attempts to harvest credentials from process memory on Linux systems. It specifically looks for HTTP traffic (flow:to_client,established) containing both the string "/proc/self/mem" and "password" (case-insensitive) within the file data. This combination suggests a tool or script is attempting to read memory for credential extraction, often associated with techniques like credential dumping.
This rule detects attempts to extract credentials from the Linux /proc filesystem over an SSH connection. Specifically, it looks for network traffic containing "/proc/", "/mem", and "ssh" (case-insensitive) within the same TCP flow to a server on port 22. This combination suggests an attacker might be trying to read sensitive memory regions or files related to SSH processes to dump credentials.
This rule detects attempts to access cached domain credentials via the Windows Registry over the SMB protocol (port 445). It specifically looks for the string "SECURITY\Cache" within TCP traffic directed to the HOME_NET on port 445, indicating a potential credential access attempt.
This rule detects attempts to dump NTDS.dit via the Volume Shadow Copy technique over HTTP. It specifically looks for HTTP URIs containing both 'vssadmin' and 'ntds.dit' (case-insensitive). This combination suggests an attacker is trying to exfiltrate the NTDS.dit file, which contains Active Directory database information, using the vssadmin utility to create a shadow copy and then access the file.
This rule detects attempts to read the bash history file, typically using the 'cat ~/.bash_history' command, over a TCP connection to port 22 (SSH). This activity is often associated with credential harvesting by an attacker who has gained access to a system and is looking for sensitive information, such as previously entered commands that might contain passwords or other credentials.
This rule detects attempts to steal OAuth access tokens by abusing redirect URIs. It specifically looks for HTTP requests containing both 'access_token=' and 'redirect_uri=' in the URI, which could indicate an attacker trying to capture a legitimate access token by redirecting it to a controlled URI.
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