Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
3,123 detections
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Detects Shellshock bash CGI exploitation attempts
Detects exploitation of application vulnerabilities for denial of service
Detects when five or more user accounts are deleted within a one-hour period by a single user. This activity can indicate malicious intent to disrupt operations or cover tracks.
Detects deletion of MFA configurations to enable authentication bypass
Detects an unusually high volume (100 or more within an hour) of API calls (POST, DELETE, PUT methods to URIs containing 'api') originating from a single IP address. This activity could indicate various malicious behaviors such as brute-force attacks, credential stuffing, web application attacks, or a denial-of-service attempt against the API endpoint.
This rule detects an unusually high volume (10 or more within an hour) of file creations with extensions commonly associated with backup files (.backup, .bak, .old). This activity could indicate an adversary attempting to inhibit system recovery by creating numerous backup files, potentially to overwrite legitimate backups or to stage data for exfiltration or destruction.
This rule detects a potential HTTP POST flood Distributed Denial of Service (DDoS) attack. It triggers an alert when a single source IP address sends 100 or more HTTP POST requests to the server within a 10-second window. This behavior is indicative of an attempt to overwhelm the server with requests, consuming resources and potentially leading to service disruption.
This rule detects a potential DNS Reflection Amplification Distributed Denial of Service (DDoS) attack. It triggers an alert when UDP traffic targeting port 53 (DNS) on the home network has a data size greater than 512 bytes and occurs at a rate of 100 or more packets within a 5-second window from the same destination.
This rule detects a direct ICMP Flood Denial of Service (DoS) attack. It triggers when more than 500 ICMP echo request (type 8) packets are sent to a single destination within a 5-second interval. This high volume of ICMP traffic is characteristic of an attempt to overwhelm a target system or network with ping requests, leading to service disruption.
This rule detects an outbound email bombing campaign by monitoring TCP connections to port 25 (SMTP). It triggers an alert if a single source IP address initiates 200 or more established connections to port 25 within a 60-second window. This high volume of outbound email connections from a single source is indicative of an attempt to overwhelm an email server or recipient with a large number of emails, often associated with denial-of-service attacks.
This rule detects attempts to modify the end-of-file marker on a network share, specifically looking for the 'SetEndOfFile' operation over SMB. This activity can be indicative of an attacker manipulating file sizes or content on shared resources, potentially as part of data staging or to evade detection. The rule is configured with a threshold to alert on 20 such events from the same source within 30 seconds, aiming to reduce noise from legitimate, infrequent operations.
This rule detects unusual network connection patterns characterized by a high volume of connections to a remote IP address within a 5-minute window, combined with anomalous connection durations. Specifically, it flags scenarios where there are more than 1000 connections and either the 95th percentile of connection durations is very short (less than 50ms) or the 5th percentile of connection durations is very long (greater than 30000ms). These patterns can indicate activities such as network scanning, denial-of-service attempts, or command and control communication.
This rule detects the creation of common ransomware ransom note filenames on a device. It triggers when two or more distinct ransom note files are created within a 5-minute window, indicating potential ransomware activity.
Detects high-volume SQL operations indicative of data manipulation attacks
Detects TCP SYN flood denial of service attack patterns
Detects OS-level TCP connection exhaustion for denial of service
Detects Master Boot Record overwrite for disk wiping attacks
CVE-2026-42945, dubbed "NGINX Rift," is a critical (CVSS 9.2) heap buffer overflow vulnerability in the ngx_http_rewrite_module of NGINX Open Source, NGINX Plus, and related products. It is triggered when a specific rewrite configuration pattern—using an unnamed PCRE capture (e.g., $1) with a replacement string containing a question mark (?)—is combined with a subsequent rewrite, if, or set directive. Exploitation can lead to reliable worker process crashes (Denial of Service) and, under certain conditions such as disabled ASLR, unauthenticated Remote Code Execution (RCE)
Detects an unusually high volume of web requests (1000 or more per minute) originating from a single IP address to an IIS web server. This pattern can indicate various malicious activities such as brute-force attacks, denial-of-service (DoS) attempts, or aggressive web scanning.
Payload Ransomware File Artifacts
Cortex XDR
Detects the creation of files with the .payload extension or the RECOVER_payload.txt ransom note, indicating active encryption by Payload ransomware.
This rule detects attempts to push malicious firmware to a device via TFTP (Trivial File Transfer Protocol). It specifically looks for UDP traffic on port 69 (TFTP) where the packet content starts with "|00 02|" (indicating a TFTP write request) and the data size is greater than 10000 bytes, suggesting a firmware image transfer.
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