Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects anomalous unauthenticated HTTP requests targeting Citrix NetScaler ADC/Gateway, characterized by suspicious URI patterns, non-standard HTTP methods, and malformed request parameters. This rule is designed to identify potential exploitation attempts consistent with CVE-2026-88771.
IOC sweep for ARTEX campaign indicators: C2 host, nine proxy IPs, xcai.pro and its subdomains, and the CLAUDE.md URL across Defender, CEF/firewall, DNS and Entra sign-in telemetry. Domains match on exact host or subdomain only, connection types are limited to real connection events, and sign-ins are limited to successes and credential failures.
Detects clusters of high-volume external source IPs from multiple countries sweeping the same financial web services within an hour.
Detects outbound network traffic associated with the Azazel operation, including connections to identified C2 infrastructure, open directory/upload listeners, domain-specific staging servers, and exfiltration attempts to MEGA cloud storage endpoints.
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 potential exploitation attempts targeting unpatched Citrix NetScaler ADC or Gateway devices, specifically looking for unauthenticated requests to management or sensitive endpoints that contain command execution indicators. This rule is designed to identify activity associated with vulnerabilities similar to CVE-2026-88771.
Detects HTTP requests, DNS lookups, user-agents, or response bodies referencing Danfoss refrigeration control systems (AK-SM, AK-SC) originating from external IP addresses (outside private/loopback ranges).
Detects a multi-stage compromise sequence involving anomalous authentication followed by VPN session establishment and a burst of outbound connections from Citrix ADC/Gateway appliances. Tightened to reduce false positives from legitimate admin access, routine VPN sessions, and authorized appliance telemetry/updates.
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 DNS lookups and outbound network connections to known command and control (C2) and staging domains associated with the STAC4924 campaign. The rule performs strict matching on domain names to ensure that subdomains are identified while avoiding false positives from partial string matches within URLs.
Detects clusters of high-volume external source IPs from multiple countries sweeping the same financial web services within an hour.
Detects clusters of high-volume external source IPs from multiple countries sweeping the same financial web services within an hour.
Detects outbound network connections (HTTPS/TLS) to known malicious domains used by TA419 for AitM (Adversary-in-the-Middle) phishing campaigns. These domains are identified as part of a spoofed OneDrive document/file sharing theme intended to steal user credentials.
Detects HTTP requests directed at NetScaler AAA or Gateway authentication endpoints that exhibit characteristics indicative of exploitation attempts against CVE-2026-88771. The rule monitors for anomalies such as excessive Content-Length headers, unusually large URI query parameters, or the presence of duplicated HTTP headers, which may be leveraged to bypass security controls or trigger buffer-related vulnerabilities during the authentication process.
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.
Detects outbound network connections (HTTPS/TLS) to known malicious domains used by TA419 for AitM (Adversary-in-the-Middle) phishing campaigns. These domains are identified as part of a spoofed OneDrive document/file sharing theme intended to steal user credentials.
Detects outbound network connections (HTTPS/TLS) to known malicious domains used by TA419 for AitM (Adversary-in-the-Middle) phishing campaigns. These domains are identified as part of a spoofed OneDrive document/file sharing theme intended to steal user credentials.
This rule detects network communication with known malicious infrastructure (C2 IPs and URLs), presence of malicious files identified by SHA256 hashes on disk, and execution of known malicious files. It also correlates these activities with specific operator email addresses involved in the malicious campaign.
Detects DNS lookups and outbound network connections to known command and control (C2) and staging domains associated with the STAC4924 campaign. The rule performs strict matching on domain names to ensure that subdomains are identified while avoiding false positives from partial string matches within URLs.
Detects potential exploitation attempts targeting unpatched Citrix NetScaler ADC or Gateway devices, specifically looking for unauthenticated requests to management or sensitive endpoints that contain command execution indicators. This rule is designed to identify activity associated with vulnerabilities similar to CVE-2026-88771.
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