Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Stealth FIN Scan Port Probe
Suricata
This rule detects a stealth FIN scan port probe. A FIN scan is a type of port scan that sends TCP segments with only the FIN flag set. If the target port is closed, it should respond with an RST segment. If the port is open, it should ignore the FIN segment. This rule triggers if 10 such FIN packets are observed from a single source within a 30-second window, indicating a potential port scan attempt.
This rule detects HTTP requests made to 'search.censys.io', indicating a query to the Censys Internet Asset Database. This activity is often associated with reconnaissance efforts, where an attacker or security researcher gathers information about internet-facing assets.
This rule detects WMI DCOM port reconnaissance activity targeting the Endpoint Mapper service on port 135. It triggers an alert when a source IP initiates 10 or more TCP SYN packets to port 135 on the HOME_NET within a 30-second window, indicating a potential network scan.
This rule detects web directory brute-force attempts by identifying HTTP requests where the User-Agent header contains the string "DirBuster". DirBuster is a well-known tool used for brute-forcing directories and file names on web servers.
This rule detects web directory brute-force attempts by identifying the 'gobuster' string in the HTTP User-Agent header. Gobuster is a common tool used for directory and file enumeration on web servers, often as part of reconnaissance or vulnerability scanning activities. The rule specifically targets HTTP traffic flowing to the server.
This rule detects attempts to establish a TCP connection to port 902 on the home network, which is commonly used for VMware ESXi management. The rule specifically looks for SYN packets (flags:S) and triggers if there are at least 3 such connection attempts from the same source within a 60-second window. This could indicate an attempt to access or scan the ESXi management interface.
This rule detects an ICMP ping sweep for host discovery, a technique used by attackers to identify active hosts on a network. It triggers when more than 20 ICMP echo requests (type 8) are sent from a single source within a 10-second window to the home network.
This rule detects attempts to access SNMP (Simple Network Management Protocol) services on the home network using the default community string 'public'. It specifically looks for the string 'public' within TCP traffic destined for port 161 (the standard SNMP port). A threshold of 5 attempts within 30 seconds from the same source IP will trigger an alert, indicating potential brute-force or reconnaissance activity against SNMP devices.
This rule detects a Deauthentication (Deauth) attack pattern, specifically targeting forced Wi-Fi reconnections. It triggers an alert when a high volume (50 or more) of TCP SYN packets are observed from a single source IP address within a 5-second window directed towards the home network. This pattern is indicative of an attacker attempting to flood a Wi-Fi network with deauthentication frames, forcing legitimate clients to disconnect and then reconnect, which can be exploited for various malicious purposes like capturing handshakes or facilitating man-in-the-middle attacks.
This rule detects a high volume of TCP SYN packets from an external IP address to the internal network, indicative of an attempted remote service access or port scan. Specifically, it triggers if 5 or more TCP SYN packets are observed from the same source IP within a 30-second window, targeting any port on the home network.
This rule detects attempts to enumerate Wi-Fi network profiles by looking for the command 'netsh wlan show' within HTTP URI requests. This activity is often associated with web shell usage, where an attacker has gained remote access to a web server and is using it to gather information about the underlying system's network configuration.
This rule detects attempts by a client on the home network to check internet connectivity by querying external IP lookup services over HTTP. It specifically looks for requests to domains like api.ipify.org, ifconfig.me, checkip.amazonaws.com, and icanhazip.com. A threshold is set to trigger an alert if five such requests are observed from the same source within 30 seconds, indicating a potential network scan or reconnaissance activity.
This rule detects attempts to query the domain password policy over SMB by looking for the 'NetUserModalsGet' content within TCP traffic on port 445. This activity is often associated with reconnaissance or discovery phases by attackers to understand password complexity requirements.
This rule detects attempts to enumerate password policy information, specifically the 'pwdHistoryLength' attribute, from a domain controller via an LDAP query. It looks for TCP traffic on port 389 (LDAP) where the client sends a query containing both '(objectClass=domain)' and 'pwdHistoryLength' in a case-insensitive manner.
This rule detects a potential Azure AD user account bulk enumeration attempt. It triggers when a source IP makes 20 or more HTTP requests within 30 seconds to 'graph.microsoft.com' with the URI containing '/users'. This pattern is indicative of an attacker attempting to enumerate multiple user accounts in Azure AD.
This rule detects attempts to enumerate domain group membership via LDAP queries. It specifically looks for TCP traffic to port 389 (LDAP) containing the string "(objectClass=group)" in a case-insensitive manner. A threshold is applied to trigger an alert if 10 such queries are observed from the same source within a 30-second window, indicating a potential network scan or reconnaissance activity.
This rule detects attempts to enumerate permission group memberships remotely over the Server Message Block (SMB) protocol, specifically targeting port 445. The detection is based on the presence of the case-insensitive string "NetGroupEnum" within the TCP payload, indicating a network scan or reconnaissance activity aimed at discovering group information.
This rule detects attempts to enumerate network connection tables remotely over SMB (port 445). It specifically looks for the string "NetConnectionEnum" in TCP traffic directed to port 445 on the home network, indicating a potential network discovery activity.
This rule detects HTTP requests to 'portal.azure.com', indicating access to the Azure management portal. A threshold is set to trigger an alert if 10 such requests are observed from the same source IP within 60 seconds. This activity is classified as a network scan, potentially for infrastructure discovery.
This rule detects attempts to enumerate installed software on a Windows machine via Remote WMI (Windows Management Instrumentation) over SMB (Server Message Block) on port 445. Specifically, it looks for the string "Win32_Product" within TCP traffic destined for port 445, indicating a WMI query for installed products. A threshold of 5 occurrences within 30 seconds from the same source is set to reduce false positives.
This rule detects attempts to enumerate the VMware vSphere virtual machine inventory via the API. It specifically looks for HTTP POST requests to the '/sdk/vimService' URI with 'RetrieveProperties' in the client body, indicating a query for system properties, which can include VM inventory details. The detection is focused on network traffic to port 443 (HTTPS) within the home network.
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