Darshan Thummar
@MightyCompletionist
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2,107 detections
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Detects unusually large HTTP POST requests which may indicate data exfiltration activity over web protocols. The rule specifically looks for HTTP POST methods and is designed for Suricata, a network intrusion detection system.
This rule detects HTTP requests made to the Shodan API (api.shodan.io). This activity is often associated with reconnaissance, where an attacker or security researcher uses Shodan to gather information about internet-connected devices and services. The rule specifically looks for the 'api.shodan.io' string within the HTTP host header, indicating an attempt to query the Shodan service.
This rule detects attempts to create new user accounts via SMB (Server Message Block) by looking for the 'NetUserAdd' function call within SMB traffic. This could indicate an attacker attempting to establish persistence or escalate privileges by creating new accounts on a target system.
This rule detects attempts to execute remote services over SMB, specifically looking for traffic on port 445 containing both the SMB signature and the 'Service Control' string. This combination suggests an attempt to interact with or manipulate services on a remote system via SMB, which is a common technique used by attackers for lateral movement or privilege escalation.
This rule detects the delivery of a malicious document exploiting CVE-2021-40444, an MSHTML remote code execution vulnerability. It specifically looks for HTTP traffic containing a Word document (word/document.xml) with embedded relationships that include an HTTP reference, indicating an attempt to fetch remote content, which is characteristic of the exploit delivery mechanism.
This rule detects potential NTLM Relay attacks over SMB. It specifically looks for TCP traffic on port 445 (SMB) directed to the home network, and within that traffic, it identifies the presence of both the SMB protocol signature ('|FF|SMB') and the NTLMSSP (NTLM Security Support Provider) signature. This combination suggests an attempt to relay NTLM authentication.
This rule detects potential network sniffing by identifying an unusual mix of network protocols originating from a single source IP address. Specifically, it triggers an alert if a source IP sends 10 or more packets within 60 seconds that are neither TCP (protocol 6), UDP (protocol 17), nor ICMP (protocol 1). This behavior could indicate an attacker using tools to capture raw network traffic, as these tools often process protocols beyond the common ones.
This rule detects an FTP brute force attempt by monitoring TCP connections to port 21 (FTP) on the home network. It triggers an alert if 20 or more TCP SYN packets (indicating new connection attempts) are observed from the same source IP address within a 60-second window. This behavior is indicative of an attacker repeatedly trying to guess FTP credentials.
This rule detects DNS queries for typosquatted domains related to npmjs. Specifically, it looks for queries to domains ending in 'npmjs.net', 'npmjs.org', 'npmjs.io', or 'npmjs.co'. This is indicative of potential supply chain attacks or attempts to trick users into downloading malicious packages from fake registries.
This rule detects Address Resolution Protocol (ARP) spoofing attempts by looking for ARP reply packets (opcode 2) on the network. A threshold is applied to trigger an alert if 20 or more ARP replies are observed from the same source within a 10-second window, which is indicative of malicious ARP activity.
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