Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
653 detections
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Detects repeated HTTP POST requests containing 'ScreenConnect' in the URI, originating from external networks. This pattern is indicative of automated scanning activity attempting to exploit potential authentication bypass or session hijacking vulnerabilities (such as CVE-2026-84869) in ConnectWise ScreenConnect instances.
Detects high-frequency TCP SYN packet bursts targeting port 37777 (commonly used by Dahua surveillance devices). The detection triggers when more than 50 SYN packets from a single source are observed within a 10-second window, suggesting automated reconnaissance or vulnerability scanning activity.
This rule detects suspicious UDP traffic directed at port 8800 targeting the Dahua P2P cloud relay interface. It specifically monitors for enumeration attempts against device serial numbers, which may be a precursor to unauthorized access or reconnaissance against vulnerable Dahua devices.
Detects execution and file artifacts associated with the 'fscan' network scanning tool, which is commonly used for internal network discovery and vulnerability scanning. The rule monitors for the presence of the fscan binary or evidence of its output files, specifically 'result.txt', often in combination with scanning parameters like port strings or target service references.
Detects the deployment and activity of SilkParasite-associated Linux threats, including XMRig cryptocurrency miner shell scripts and standalone Meterpreter agents. The rule also captures the execution of a custom Python fleet-scanning tool used to interact with exposed Redis instances for unauthorized command execution and infrastructure management.
Detects high-frequency connection attempts to TCP port 445 within the internal network or across RFC1918 subnets, indicating potential reconnaissance activity such as SMB share scanning commonly associated with lateral movement or network mapping.
Detects high-frequency connection attempts to PPTP (1723) and L2TP (1701) VPN ports from an external source, indicative of automated scanning or vulnerability discovery activity.
This rule detects high-frequency TCP SYN connection attempts originating from external networks targeting common administrative or tunneling ports (1723/PPTP, 1701/L2TP, 22/SSH) on internal systems. The detection uses a threshold of 100 connection attempts within 120 seconds, which is characteristic of automated reconnaissance and network scanning behavior.
Detects repeated suspicious network requests, including non-standard HTTP methods and URI structures, as well as TLS SNI anomalies, targeting the internal sales portal 'agent.3bb.co.th'. The rule triggers when a threshold of 20 requests within a 60-second window is reached from a single source, indicating likely automated reconnaissance or vulnerability scanning activity.
Detects a host initiating rapid sequential SMB tree connections to more than 10 distinct remote hosts within a 5-minute window. This behavior is indicative of network reconnaissance, specifically the enumeration of accessible SMB shares, which is a common precursor to lateral movement and large-scale ransomware encryption activity as observed in DragonForce-related incidents.
This rule detects high-frequency account and email address enumeration attempts. It monitors syslog data for SMTP commands such as VRFY, EXPN, or RCPT TO, and analyzes Microsoft Entra ID (SigninLogs) for authentication failures specifically associated with error code 50034 (user not found). Both behaviors are indicative of an adversary attempting to validate user identities within an environment, often as a precursor to targeted phishing or brute-force attacks.
Detects high-volume bursts of HTTP GET requests against specific paths associated with a Vite development server (/@vite/client, /@fs/, /src/) on port 5173. This pattern is indicative of automated reconnaissance or vulnerability scanning targeting an exposed development environment.
Detects high-frequency connection attempts to PPTP (1723) and L2TP (1701) VPN ports from an external source, indicative of automated scanning or vulnerability discovery activity.
Detects high-frequency connection attempts to PPTP (1723) and L2TP (1701) VPN ports from an external source, indicative of automated scanning or vulnerability discovery activity.
This rule detects high-frequency TCP SYN connection attempts originating from external networks targeting common administrative or tunneling ports (1723/PPTP, 1701/L2TP, 22/SSH) on internal systems. The detection uses a threshold of 100 connection attempts within 120 seconds, which is characteristic of automated reconnaissance and network scanning behavior.
This rule detects high-frequency TCP SYN connection attempts originating from external networks targeting common administrative or tunneling ports (1723/PPTP, 1701/L2TP, 22/SSH) on internal systems. The detection uses a threshold of 100 connection attempts within 120 seconds, which is characteristic of automated reconnaissance and network scanning behavior.
This rule monitors web server logs (IIS, W3C, and Azure Application Gateway) for incoming traffic that matches known malicious or automated vulnerability scanners, as well as requests for common system fingerprinting paths (such as /server-status or /.git/config). The rule aggregates these hits by source IP address to identify potential active reconnaissance or vulnerability scanning attempts.
Detects automated directory fuzzing attempts against Azure Storage blobs targeting sensitive files like .env, .pem, or configuration files. The rule identifies suspicious activity by aggregating requests from Anonymous or SAS-authenticated sources that exhibit high request volumes and access to multiple distinct sensitive paths, while excluding known legitimate bulk-transfer and synchronization tools.
Detects the execution of BloodHound related processes combined with a high volume of LDAP queries (Event ID 1644), which is indicative of Active Directory environment reconnaissance.
Detects execution and file artifacts associated with the 'fscan' network scanning tool, which is commonly used for internal network discovery and vulnerability scanning. The rule monitors for the presence of the fscan binary or evidence of its output files, specifically 'result.txt', often in combination with scanning parameters like port strings or target service references.
Detects execution and file artifacts associated with the 'fscan' network scanning tool, which is commonly used for internal network discovery and vulnerability scanning. The rule monitors for the presence of the fscan binary or evidence of its output files, specifically 'result.txt', often in combination with scanning parameters like port strings or target service references.
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