Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects incoming HTTP requests to Microsoft Exchange servers containing malicious X-AnonResource-Backend or X-BEResource headers, which are indicative of an attempt to exploit the ProxyLogon SSRF vulnerability (CVE-2021-26855).
Detects HTTP traffic initiating a WebSocket protocol upgrade with a specific 'binary' subprotocol header, characteristic of the Brickstorm backdoor used by the UNC5221 threat actor for command and control (C2) communication.
Detects network traffic associated with the Turla group's STOCKSTAY malware, specifically identifying outbound WebSocket upgrade requests directed to the known command-and-control domain weatherdataai.theworkpc.com.
Detects SMTP traffic containing XLSX file attachments, specifically looking for base64 encoded content that matches the criteria for CVE-2025-60727. This rule monitors network traffic for the delivery of potential malicious Office documents.
Detects HTTP response bodies containing common PE/Shellcode magic headers (MZ, PE, or NOP sleds) which are associated with the delivery of payloads designed to exploit or utilize the Windows KernelCallbackTable for process injection. The detection focuses on suspicious content delivered over HTTP connections.
Detects HTTP requests where the referrer is a major LLM service (e.g., ChatGPT, Claude) but the destination host uses keywords indicative of phantom squatting (e.g., parcel, delivery, login) suggesting an attempt to use LLM-generated content or platforms to facilitate malicious redirects or phishing.
Detects HTTP POST requests to known phishing kit endpoints 'panel_track.php' or 'verify_api.php', which are associated with the Montana Empire credential harvesting campaign.
This rule detects outbound HTTP traffic generated by the WinHTTP library, specifically when the User-Agent identifies as WinHttp.WinHttpRequest. This pattern is indicative of potential post-exploitation activity, such as command-and-control communication or data exfiltration, originating from a process associated with an exploited Excel document (CVE-2025-60727).
Detects SMTP traffic containing XLSX file attachments, specifically looking for base64 encoded content that matches the criteria for CVE-2025-60727. This rule monitors network traffic for the delivery of potential malicious Office documents.
Detects SMB traffic patterns containing commands indicative of file obfuscation or permission tampering, specifically the use of 'attrib' to set hidden or system attributes, 'icacls' to deny access to files, or PowerShell execution with the '-WindowStyle Hidden' argument.
Detects inbound HTTP requests containing JNDI lookup strings commonly used to exploit the Log4Shell vulnerability (CVE-2021-44228). The rule specifically monitors for JNDI lookups over ldap, rmi, or dns protocols within HTTP traffic, which can lead to remote code execution.
Detects anomalous network traffic patterns characteristic of the Mimikatz 'lsadump' module performing a DCSync attack. The rule monitors for DRSUAPI (Directory Replication Service Remote Protocol) RPC requests, specifically the DsGetNCChanges operation, which is abused to synchronize Active Directory data including sensitive password hashes.
This rule detects HTTP POST requests containing a Content-Length header value indicating a body size exceeding 10MB. Large POST requests may indicate data exfiltration, large file uploads, or misuse of HTTP channels for data transfer to external destinations.
Detects network exploitation attempts targeting the SMBv1 protocol using the EternalBlue vulnerability (MS17-010). This vulnerability was famously exploited by the WannaCry and NotPetya ransomware to propagate across networks.
Detects DNS queries containing unusually long subdomains (50+ characters) encoded in Base64, which is a common technique used for command-and-control (C2) communication or data exfiltration via DNS tunneling.
Detects anomalous DCOM RPC bind requests on port 135 targeting WMI-related interfaces, which is a common indicator of lateral movement using Windows Management Instrumentation (WMI) over DCOM.
Detects attempts to exploit the Log4Shell vulnerability (CVE-2021-44228) by monitoring HTTP headers for JNDI lookup strings. The rule inspects traffic for malicious patterns like '${jndi:ldap://', '${jndi:rmi://', or '${jndi:dns://', which are used to trigger remote code execution in vulnerable Java applications.
Detects repeated inbound TCP connection attempts to port 3389 (RDP) from a single source address within a short timeframe. This behavior is indicative of an RDP brute-force or password spraying attack targeting remote desktop services.
Detects attempts to exploit Microsoft Exchange vulnerabilities (CVE-2021-34473, CVE-2021-34523, CVE-2021-31207), collectively known as ProxyShell. The rule monitors inbound HTTP requests targeting the /autodiscover/ endpoint with specific path traversal patterns and malicious components used to stage web shells or execute arbitrary commands.
This rule detects potentially malicious activity leveraging the Windows Remote Management (WinRM) protocol over HTTP (ports 5985/5986). It specifically monitors for POST requests to the '/wsman' URI that contain the string 'powershell' in the request body, which is indicative of remote command execution via WinRM using PowerShell.
Detects the use of the FTP STOR command to transfer files with sensitive extensions (.docx, .pdf, .xlsx, .zip, .7z) to external networks. This behavior is indicative of potential data exfiltration via an unencrypted alternative protocol.
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