Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects UDP multicast traffic to 224.0.0.255 on port 31339. This traffic is normally used by the PassMark Endpoint utility (BurnInTest) for peer discovery, but has been observed being repurposed by threat actors such as UAC-0184 to establish a stealthy command and control channel.
Detects the specific User-Agent string 'NSIS_InetLoad (Mozilla)' associated with the SessionGate multi-stage loader during its command and control (C2) check-ins. SessionGate is delivered via impersonated open-source tooling websites and gated TDS redirection chains.
Detects network connections originating from the Vulkan loader executable (`vulkaninfo.exe`) over port 1234. This behavior is indicative of TA4922 utilizing RomulusLoader to establish command and control communications and retrieve secondary payloads, such as RMM tools.
This rule identifies an anomalous surge in network connection attempts to a particular remote IP address. It establishes a baseline of average daily connection counts to each remote IP over the past week. It then compares the current hourly connection count to this baseline, triggering an alert if the current count is more than five times the baseline and surpasses a total of 500 connections within that hour. This could indicate various malicious activities such as data exfiltration, command and control communication, or a denial-of-service attack originating from the monitored environment.
This rule detects an unusually high number of network connection events originating from a single device to a remote IP address within a one-minute interval. This behavior can be indicative of various malicious activities, including network scanning, port scanning, or a denial-of-service (DoS) attempt. It could also signal a compromised host attempting to establish numerous connections for command and control, data exfiltration, or further reconnaissance.
SSH Brute Force Attempt Detected
Suricata
Detects repeated failed SSH authentication attempts which may indicate brute force activity against SSH services. The rule specifically looks for 8 SSH connection attempts to port 22 within a 60-second window from the same source IP.
This rule set detects various stages of the JFMBackdoor and Showboat malware, including DLL sideloading of FLTLIB.dll by fltMC.exe from non-standard directories, network connections to known C2 and staging infrastructure (namefuture.site or 23.27.201.160), command-line activity referencing a specific Pastebin URL used by Showboat for process-hiding code, and the creation of JFMBackdoor payload artifacts (flt.bin, scr.mui).
This rule detects attempts to modify local or domain group memberships by monitoring TCP traffic on port 389 (LDAP). It specifically looks for the keywords "member" and "add" within the traffic, indicating an attempt to add a member to a group. A threshold of 5 occurrences within 60 seconds from the same source IP is set to reduce false positives.
This rule detects the creation of an XDG Autostart entry on a Linux host by looking for network traffic containing the string "/etc/xdg/autostart/" in a TCP flow to the server on port 22. This directory is commonly used for persistence by malware to automatically execute at system startup.
This rule detects network traffic on TCP port 445 (SMB) containing the string "Security Packages" in a case-insensitive manner. This pattern is often associated with the registration or use of Security Support Provider DLLs, which can be a persistence mechanism (T1547.005) used by adversaries to maintain access to a system.
This rule detects network traffic containing the string "/etc/udev/rules.d/" over TCP port 22 (SSH). This string is indicative of an attempt to modify udev rules, which can be used for Linux persistence by executing malicious scripts or commands when specific hardware events occur. The detection is focused on traffic flowing from the home network to a server on the home network, suggesting an internal system attempting to modify udev rules on another internal system via SSH.
This rule detects the creation of an Emond rule on macOS systems, which can be used for persistence. It specifically looks for network traffic containing the string "/etc/emond.d/" in a TCP flow to a server on port 22 (SSH). This indicates an attempt to establish or modify an Emond rule, which allows for scheduled execution of commands or scripts.
This rule detects attempts to block defender access by holding a file or resource lock. Specifically, it looks for TCP traffic on port 445 (SMB) containing the string "LockFile" in a case-insensitive manner. A threshold of 10 occurrences within 10 seconds from the same source IP is set to trigger an alert, indicating potential malicious activity aimed at hindering security software.
This rule detects a high volume of HTTP/2 requests (more than 3000 per minute) originating from a single remote IP address, especially when these requests target a diverse set of URIs (more than 10 distinct URIs). This pattern can indicate a denial-of-service (DoS) attack, a web scanner, or other malicious automated activity attempting to overwhelm a service or enumerate resources.
This rule detects attempts to load a DLL module from a remote network path over SMB. It specifically looks for traffic on port 445 (SMB) containing both ".dll" and "\\" (indicating a network path) in a case-insensitive manner. This behavior is often associated with trojan activity or other forms of malicious execution where an attacker might try to load a malicious DLL from a shared network drive.
This rule detects potential rogue captive portal credential harvesting pages by inspecting HTTP responses for the presence of keywords like 'captive', 'password', and 'connect' within the file data. These keywords, when found together in a client-bound HTTP response, suggest an attempt to mimic a legitimate captive portal to steal user credentials.
This rule detects attempts to capture credentials via an 'Evil Twin' access point by looking for HTTP POST requests to URIs containing both 'login' and 'wifi'. This combination suggests a malicious captive portal designed to trick users into submitting their credentials.
Detects DNS requests to a known BNB Smart Chain Testnet JSON-RPC endpoint used by AnimateClipper to dynamically resolve its actual C2 domain via a smart contract.
This rule detects an unusually high number of web search queries (identified by 'search' or 'query' in the URI) originating from a single IP address within a one-hour window. A threshold of 100 or more queries triggers the alert. This behavior could indicate automated activity such as web scraping, reconnaissance, or a denial-of-service attempt against the search functionality.
Detects network connections to known suspicious domains or IP addresses
Detects network traffic over TCP port 886, which is specifically used by Atlas RAT for command and control check-ins, plugin downloads, and encrypted data exfiltration in TA4922 campaigns.
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