Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Remote AT Job Scheduled via SMB
Suricata
This rule detects attempts to schedule a remote AT job via SMB. It specifically looks for TCP traffic on port 445 (SMB) directed to the home network, containing the case-insensitive strings "atsvc" and "JobAdd". This combination indicates an attempt to use the AT service to add a scheduled task remotely, which can be a method for persistence or execution by attackers.
This rule detects multiple attempts to pull container image manifests from public Docker registries (registry.hub.docker.com or ghcr.io). A threshold of 10 pulls within 60 seconds from the same source IP is set to identify potentially malicious or excessive activity, possibly indicating an attempt to enumerate or download numerous container images.
This rule detects attempts to execute commands within a Kubernetes pod using `kubectl exec`. It specifically looks for HTTP requests to port 8080 (often used by Kubernetes API servers or proxies) with URIs containing both '/exec' and 'pods', indicating an interactive command execution session within a pod.
This rule detects the string "xdotool" within an SSH session (port 22) traffic flowing from the client to the server. xdotool is a command-line tool that simulates keyboard input and mouse activity, often used for automated input injection. Detection of this string suggests an attempt to automate actions within an SSH session, which could be indicative of malicious activity such as automated command execution or data exfiltration.
This rule detects potential mass email collection activity over IMAP (port 143). It triggers an alert if a client makes 20 or more 'FETCH BODY[]' requests within a 60-second window to an IMAP server. This behavior is indicative of an attacker or malicious script attempting to download a large number of email bodies, potentially for data exfiltration or analysis.
This rule detects an HTTP flood application-layer Distributed Denial of Service (DDoS) attack. It triggers when a single source IP address sends 200 or more HTTP GET requests to a server within a 10-second window. This behavior is indicative of an attempt to overwhelm the application or server with a high volume of legitimate-looking HTTP requests.
This rule detects HTTP POST requests to pastebin.com's API for pasting content, specifically targeting the '/api/api_paste.php' endpoint. It triggers if the size of the data being uploaded is greater than 1000 bytes, indicating a potential data exfiltration attempt to a public text storage site.
This rule detects the execution of a system shutdown command ('shutdown -h now') over an SSH connection. It specifically looks for this string within TCP traffic directed to port 22 (SSH) on the home network, indicating a remote shutdown initiated via SSH.
This rule detects attempts to initiate a remote system shutdown via the Server Message Block (SMB) protocol. It specifically looks for the string "InitiateSystemShutdown" within TCP traffic directed to port 445 (SMB) on the home network. This activity is often associated with malicious behavior, such as ransomware or destructive attacks, aiming to disrupt systems.
This rule detects potential Command and Control (C2) communication utilizing DNS at the application layer. It specifically looks for DNS queries and triggers an alert if a single source IP performs more than 30 DNS queries within a 60-second window, indicating a high frequency of DNS activity that could be indicative of C2.
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 attempts to manipulate database data on a remote MySQL server (port 3306) by identifying 'UPDATE' and 'SET' SQL commands within TCP traffic. It uses a threshold to alert on a high frequency of these commands from a single source, indicating potential malicious activity like data modification or integrity compromise.
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 potential command and control (C2) activity where an internal HTTP proxy port (8080) is used as a relay. Specifically, it looks for HTTP CONNECT requests, which are commonly used for tunneling through proxies, directed to port 8080 within the home network. A threshold of 10 such requests within 60 seconds from a single source IP triggers the alert, indicating suspicious proxy usage for C2 communication.
This rule detects the use of SFTP (Secure File Transfer Protocol) as a covert command and control (C2) data channel. It specifically looks for TCP traffic on port 22 (SFTP's default port) with a specific content pattern ('|00 00 00|') within the first 4 bytes of the payload, a payload size between 100 and 500 bytes, and a high frequency (20 times in 60 seconds) from a single source IP address. This pattern and frequency could indicate an attempt to exfiltrate data or maintain C2 communication disguised as legitimate SFTP traffic.
This rule detects C2 traffic that attempts to impersonate legitimate Microsoft Update services. It specifically looks for HTTP traffic where the host header contains 'windowsupdate.com' or 'update.microsoft.com' (case-insensitive) and the User-Agent header contains 'Windows-Update-Agent'. A threshold of 10 occurrences within 60 seconds from the same source IP triggers the alert, indicating potential command and control activity trying to blend in with normal Windows update traffic.
This rule detects suspicious TLS certificates that are valid for only one day and have a common name (CN) consisting of 6 or more alphanumeric characters. This pattern is often associated with malware or command and control (C2) activity, where certificates are generated on the fly with short validity periods to evade detection.
This rule detects a high volume of HTTP requests to GitHub's archive endpoint for repository cloning, specifically looking for 10 or more requests within 60 seconds from a single source IP. This behavior could indicate an attempt to collect data from multiple GitHub repositories, potentially for reconnaissance or data exfiltration purposes. The rule targets HTTP traffic where the host is 'github.com' and the URI contains '/archive/'.
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 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 access browser history files, specifically Google Chrome's history, over Server Message Block (SMB) protocol. The detection is triggered when SMB traffic contains the string "History" and "AppData\Local\Google\Chrome" (case-insensitive), indicating a potential reconnaissance activity where an attacker might be trying to exfiltrate or analyze browser history.
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