Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects potential command and control (C2) beaconing activity to domains identified as being used in the 'Operation Triangulation' campaign, which targeted iOS devices with 0-day exploits. This rule specifically looks for connections to a list of known malicious domains via proxy logs.
Detects exploitation attempts against Citrix Netscaler, Application Delivery Controller (ADS), and Citrix Gateway by identifying specific URI query patterns associated with CVE-2020-8193 and CVE-2020-8195.
Detects exploitation attempts targeting CVE-2021-27905, an arbitrary file read and SSRF vulnerability affecting Apache Solr versions up to and including 8.8.1. The rule looks for specific patterns in HTTP request URIs that are indicative of this vulnerability being exploited, such as requests containing '/solr/', '/debug/dump?', 'param=ContentStream', or 'command=fetchindex' with 'masterUrl='.
This rule detects outbound network connections to ngrok tunneling service endpoints. Ngrok is a legitimate tool that can be used to expose local servers to the internet, but it is also frequently leveraged by malicious actors for data exfiltration, command and control, and bypassing network restrictions. Detection of communication to these specific ngrok domains could indicate unauthorized use of the service for malicious purposes.
This rule detects the use of Background Intelligent Transfer Service (BITS) to connect to IP addresses directly, rather than fully qualified domain names (FQDNs). This behavior can be indicative of malicious activity, as adversaries often use BITS for command and control or data transfer, and connecting to IP addresses can be a way to bypass DNS-based security controls or to obscure the true destination.
Detects potential beaconing activity from the 3CXDesktopApp to known malicious domains associated with the 3CX supply chain compromise. This rule identifies outbound network connections initiated by the 3CXDesktopApp.exe process to a specific list of suspicious hostnames, indicating potential command and control communication.
This rule detects direct access to raw content hosted on various paste services. Adversaries often use these services to host malicious code (e.g., encrypted or encoded payloads) that is downloaded in subsequent stages of an attack, leveraging the services for command and control or defense evasion.
Detects HTTP requests with an empty user agent string in proxy logs. This can indicate an uncommon or potentially malicious request method, as legitimate browsers and many applications typically send a user agent. PowerShell's `(New-Object Net.WebClient).DownloadString` is one example of a tool that might generate such a request.
Detects exploitation attempts against Citrix Netscaler, Application Delivery Controller, and Citrix Gateway devices targeting CVE-2019-19781. The rule looks for specific URI query patterns indicative of directory traversal or direct access to vulnerable scripts.
Detects potential command and control (C2) beaconing activity to domains identified as being used in the 'Operation Triangulation' attacks, which targeted iOS devices. These domains were revealed by Kaspersky and the FSB.
Detects Server-Side Template Injection (SSTI) attempts made via GET requests. The rule looks for common SSTI payload strings within the request, specifically excluding requests that result in a 404 Not Found status code to reduce false positives.
This rule detects attempts to inject Cross-Site Scripting (XSS) payloads via GET requests in web access logs. It specifically looks for common XSS strings and encoded variations within the request URL, such as '<script>', '<iframe>', '<svg>', 'document.cookie', 'document.domain', 'onerror=', 'onresize=', 'onload=', 'onmouseover=', '${alert', 'javascript:alert', and their URL-encoded forms. The rule filters out requests that result in a 404 HTTP status code to reduce false positives.
This rule detects DNS queries for specific domains associated with the WannaCry ransomware killswitch. The presence of these queries indicates a potential WannaCry infection attempting to resolve its killswitch domain. If the domain resolves, the ransomware may cease its encryption activities.
This rule detects suspicious network requests to the Telegram API (api.telegram.org) that do not include a standard 'Telegram' or 'Bot' user-agent string. This behavior is often indicative of malware or custom tools attempting to use Telegram's API for command and control or data exfiltration without revealing their identity as a legitimate Telegram client or bot.
This rule detects HTTP requests where the User-Agent header contains ' WindowsPowerShell/'. This pattern is indicative of PowerShell making web requests, potentially for downloading files, interacting with web services, or command and control activities. This can be a legitimate administrative activity but is also frequently abused by adversaries.
Detects outbound network connections to known cryptocurrency mining pool domains. This activity is often indicative of resource hijacking (cryptojacking) where an attacker uses a compromised system's resources to mine cryptocurrency without the owner's consent. The rule specifically targets a comprehensive list of domains associated with various mining pools, primarily for Monero (XMR) and other cryptocurrencies.
Detects the default communication pattern used by the BabyShark C2 framework, specifically looking for the 'momyshark?key=' string within the URI of proxy requests. This pattern is indicative of BabyShark malware attempting to communicate with its command and control server.
Detects the use of rclone, a command-line program to manage files on cloud storage, by identifying its default user-agent string in proxy logs. This activity can indicate data exfiltration to cloud storage services.
This rule detects instances where the 'winlogon.exe' process initiates outbound network connections to public IP addresses. Winlogon.exe is a critical Windows component responsible for user logon/logoff and the secure attention sequence. Typically, winlogon.exe should not be making outbound network connections to public IPs. Such activity could indicate compromise, potentially by malware like BlackLotus, which has been observed to leverage winlogon.exe for malicious purposes, including command and control or data exfiltration.
Detects exploitation attempts targeting Pulse Secure VPN appliances via CVE-2019-11510. Specifically, it looks for requests to a URI path containing '/dana/html5acc/guacamole/', which is indicative of an attacker attempting to access the Guacamole component of the Pulse Secure appliance.
Detects the exploitation of the VMware vSphere Remote Code Execution vulnerability (CVE-2021-21972) by identifying HTTP POST requests to the '/ui/vropspluginui/rest/services/uploadova' endpoint. This specific URI indicates an attempt to upload a malicious OVA file, which is the vector for the RCE.
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