Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects potential Java webshell uploads to an SAP NetViewer server via HTTP POST requests with a 'Content-Type' of 'application/octet-stream' and URI stems containing '/irj/' and ending with '.jsp', '.class', or '.java'. This behavior might indicate exploitation of vulnerabilities like CVE-2025-31324, which allows remote code execution through webshells.
Detects the download of Ursnif malware based on specific URL patterns and a successful HTTP status code. The rule looks for URIs containing a forward slash, '.php?l=', and ending with '.cab', combined with an HTTP status code of 200, indicating a successful download.
Detects Ursnif C2 traffic by identifying specific URL patterns in proxy logs. The rule looks for URIs containing base64-like encoding indicators ('_2f', '_2b') in combination with specific file extensions and directory names ('.avi' and '/images/'). This combination is indicative of Ursnif malware's command and control communication.
Detects network communication patterns associated with the Turla ComRAT malware, specifically looking for HTTP/HTTPS requests containing '/index/index.php?h=' in the URI. This pattern is indicative of ComRAT's command and control (C2) communication.
The analytic identifies DNS queries to domains associated with the 3CX supply chain attack. This activity is significant because it can indicate a potential compromise stemming from the 3CX supply chain attack, which is known for distributing malicious software through trusted updates. If confirmed malicious, this activity could allow attackers to establish a foothold in the network, exfiltrate sensitive data, or further propagate malware, leading to extensive damage and data breaches.
Detects update checks performed by Advanced IP Scanner and Advanced Port Scanner utilities. These utilities are often used for network reconnaissance and can be considered Potentially Unwanted Applications (PUA) in some environments. The rule specifically looks for requests to '/checkupdate.php' with a set of specific query parameters, indicating an update check from these tools.
Detects POST requests to the F5 BIG-IP iControl Rest API "bash" endpoint, which allows the execution of commands on the BIG-IP. This activity can indicate an attacker exploiting a public-facing application to gain initial access and execute arbitrary commands.
This rule detects outbound network connections to IP addresses that have been observed for the first time within the last 24 hours. It specifically excludes connections to private IP address ranges (RFC1918). The detection relies on correlating current network connection events with historical 'first seen' data for IP addresses from an entity graph.
This rule detects attempts to execute files from external WebDAV shares. It specifically looks for HTTP GET requests where the User-Agent header starts with 'Microsoft-WebDAV-MiniRedir/' and the requested URI ends with common executable or script file extensions. This behavior is often observed in initial access campaigns where adversaries leverage WebDAV to deliver and execute malicious payloads.
This rule detects when a file is downloaded via HTTP and subsequently created on a system, where the file's SHA256 hash and the URL it was downloaded from are identified as malicious through VirusTotal relationships. It correlates HTTP network events with file creation events, ensuring the download precedes the file creation, and then enriches this information with VirusTotal data to confirm the malicious nature of the file and its source URL.
This rule detects HTTP web access to domains that exhibit low prevalence within the monitored environment. It specifically filters out internal RFC 1918 IP addresses and ensures that only valid Fully Qualified Domain Names (FQDNs) are considered. The prevalence is determined by a rolling maximum count of unique days a domain has been observed, with alerts triggering for domains seen 3 or fewer times. The risk score is incremented based on how low the prevalence is, with the lowest prevalence (1 day) resulting in the highest risk score.
This rule detects when a file is downloaded from an IP address and subsequently created on a system, where both the file hash and the IP address are identified by VirusTotal Relationships as being associated with each other, specifically through a 'DOWNLOADED_FROM' relationship. This indicates that the downloaded file is known to have been served from that particular IP address, potentially flagging malicious file distribution.
Detects exploitation attempts targeting Arcadyan routers, specifically looking for path traversal (CVE-2021-20090) and configuration file injection (CVE-2021-20091) vulnerabilities. The rule identifies requests containing '..%2f' (URL-encoded path traversal) and, for the configuration file injection, also 'apply_abstract.cgi', combined with requests to unauthenticated paths.
Detects network web access to a low prevalence domain
Detects executables launched from external WebDAV shares using the WebDAV Explorer integration, commonly seen in initial access campaigns.
Detect network connection to an ip address that was only seen for the first time in the past 24 hours
Alert on downloading a known file hash from a known IP with VT Relationships.
Example usage of WHOIS data, detecting an executable file download from a domain that's recently expired
Detects access attempts to a newly created domain via WHOIS enrichment.
This analytic identifies high-severity intrusion events based on the classification assigned to Snort rules within Cisco Secure Firewall logs. It leverages Cisco Secure Firewall Threat Defense logs and focuses on events classified as: A Network Trojan was Detected, Successful Administrator Privilege Gain, Successful User Privilege Gain, Attempt to Login By a Default Username and Password, Known malware command and control traffic, Known malicious file or file based exploit, Known client side exploit attempt, Large Scale Information Leak. These classifications typically represent significant threats such as remote code execution, credential theft, lateral movement, or malware communication. Detection of these classifications should be prioritized for immediate investigation.
Detect the update check performed by Advanced IP/Port Scanner utilities.
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