Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule monitors network appliance logs (Fortinet, Cisco, Meraki, WatchGuard, Sophos) for patterns associated with known vulnerabilities, including authentication bypass (CVE-2022-40684), SQL injection, path traversal, and command injection attempts within URL parameters. It also flags high-severity IPS/IDS alerts generated by these devices.
This rule monitors network device logs for patterns indicative of reconnaissance or vulnerability scanning against management and VPN interfaces of common firewall and network appliances (FortiGate, Meraki, WatchGuard, Sophos). It flags sources that either request multiple sensitive paths related to system status and configuration or employ known scanning tools (Nmap, masscan, Nuclei, zgrab, curl) in the user-agent string.
This rule monitors network device logs for patterns indicative of reconnaissance or vulnerability scanning against management and VPN interfaces of common firewall and network appliances (FortiGate, Meraki, WatchGuard, Sophos). It flags sources that either request multiple sensitive paths related to system status and configuration or employ known scanning tools (Nmap, masscan, Nuclei, zgrab, curl) in the user-agent string.
This rule identifies potential brute force or password spraying attacks against network edge devices, such as firewalls and VPN gateways. It aggregates authentication failures and denied connection attempts by source IP address. The rule differentiates between brute force attacks, characterized by a high volume of failed attempts against one or more users from a single source, and password spraying, indicated by multiple unique usernames failing authentication from the same source.
This rule monitors network appliance logs (Fortinet, Cisco, Meraki, WatchGuard, Sophos) for patterns associated with known vulnerabilities, including authentication bypass (CVE-2022-40684), SQL injection, path traversal, and command injection attempts within URL parameters. It also flags high-severity IPS/IDS alerts generated by these devices.
This rule detects anomalous, high-frequency unauthenticated POST requests targeting NetScaler ADC and Gateway management or service endpoints (/vpn/, /logon/, /nitro/). Such patterns are characteristic of automated reconnaissance and exploitation attempts, specifically targeting vulnerabilities like CVE-2026-88771 and CVE-2026-88772.
Detects high-frequency restarts, HA failovers, or process crashes (e.g., nsppe, nsaaad) on Citrix NetScaler appliances. This behavior is indicative of potential denial-of-service exploitation, such as the CVE-2026-88772 DTLS memory-overflow vulnerability.
Detects repeated SSH authentication failures originating from an external source on port 22, where the username pattern appears to be programmatically generated or enumerated (e.g., username followed by digits). This behavior is characteristic of automated brute-force attempts targeting common SSH services.
This rule monitors for a rapid sequence of TCP SYN packets directed towards common administrative ports (SSH/22, RDP/3389, SMB/445) within a short window, indicative of an automated lateral movement scanning attempt or a brute-force discovery phase originating from within the internal network.
This rule detects network beaconing behavior consistent with Cobalt Strike's default malleable C2 profiles. It monitors HTTP GET and POST requests for specific URI patterns commonly used by default Cobalt Strike configurations and triggers when multiple such requests are observed from a single host over a 15-minute window.
Detects TLS connections to a specific, potentially adversary-controlled ScreenConnect relay infrastructure endpoint. Adversaries frequently abuse legitimate remote access tools like ScreenConnect for command and control purposes.
Detects multiple attempts to connect to administrative shares (ADMIN$, C$, IPC$) from a single source within a 60-second window. This pattern is indicative of automated lateral movement or enumeration attempts using the SMB protocol.
Detects outbound HTTP requests to known Alibaba OSS buckets hosting malicious AdaptixC2 payloads. This is associated with exploitation attempts against PaperCut MF software (referencing CVE-2026-82078 and CVE-2026-81578).
Detects an exploitation attempt against PaperCut MF software leveraging SQL injection to deliver a Java bytecode loader (identified by the 'cafebabe' magic bytes) via a POST request.
This rule detects established TLS connections to external domains that exhibit characteristics often associated with phishing campaigns. Specifically, it looks for domain names in the SNI field that contain common brand names (e.g., microsoft, google, paypal) combined with typical login-related keywords (e.g., login, verify, auth) on high-churn or suspicious Top-Level Domains (TLDs) such as .top, .xyz, or .icu.
This rule detects established TLS connections to external domains that exhibit characteristics often associated with phishing campaigns. Specifically, it looks for domain names in the SNI field that contain common brand names (e.g., microsoft, google, paypal) combined with typical login-related keywords (e.g., login, verify, auth) on high-churn or suspicious Top-Level Domains (TLDs) such as .top, .xyz, or .icu.
This rule detects established TLS connections to external domains that exhibit characteristics often associated with phishing campaigns. Specifically, it looks for domain names in the SNI field that contain common brand names (e.g., microsoft, google, paypal) combined with typical login-related keywords (e.g., login, verify, auth) on high-churn or suspicious Top-Level Domains (TLDs) such as .top, .xyz, or .icu.
Detects browser-side malicious activity involving communication with Cloudflare Workers (workers.dev) endpoints typically associated with C2 beaconing (relays, ICE, socket) or the retrieval of trojanized JavaScript dependencies like 'jquery.mousewheel' which often precede second-stage agent execution.
Detects outbound HTTP requests to 'letsdiskuss.com' with a URI pattern of '/user/', which is characteristic of the 'STAC4924' loader utilizing a dead-drop resolver for command-and-control communication.
Detects a suspicious sequence of events involving NetScaler ADC or Gateway appliances: anomalous account authentication, followed by the establishment of a VPN or remote access session, and subsequent unusual outbound network activity indicating potential lateral movement or C2 communication from the appliance.
Detects a suspicious sequence of events involving NetScaler ADC or Gateway appliances: anomalous account authentication, followed by the establishment of a VPN or remote access session, and subsequent unusual outbound network activity indicating potential lateral movement or C2 communication from the appliance.
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