Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
58 detections
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This rule detects potentially malformed or truncated DTLS records on NetScaler appliances, specifically on port 443. The rule looks for packets with a specific record length configuration that may indicate a buffer overflow or other exploitation attempt targeting CVE-2026-88772. The detection logic relies on analyzing the DTLS handshake sequence and packet sizing, and the rule authors recommend correlating these events with SSL_HANDSHAKE_FAILURE (DTLSv1.0, Handshake failure-Internal Error) and appliance crash log entries to confirm potential exploitation.
Detects malicious command-and-control (C2) activity targeting Citrix NetScaler appliances (tracked as CVE-2026-88772). The rules identify specific malformed HTTP headers (NSC_LDAP, NSC_CLIENTTYPE, X-UX) used to establish a command channel, as well as potential webshell masquerading through ico-to-sig URI patterns in the /vpn/media/ path.
Detects an SSL_HANDSHAKE_FAILURE syslog event on a Citrix NetScaler appliance characterized by a DTLSv1.0 client version and a 'Handshake failure-Internal Error' reason. This pattern is indicative of exploitation attempts against CVE-2026-88772, specifically associated with the WHIPSHOT/SLAPSHOT campaign. This is a high-sensitivity precursor signal that should be correlated with system crash events on the appliance for increased confidence.
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 modifications to core NetScaler startup configuration files 'ns.conf' or 'rc.netscaler'. Attackers often target these files after initial access to establish persistence by injecting malicious commands, rewrite, or responder policies to maintain access to the appliance.
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 unauthorized process activity that reads, copies, archives, or transmits the NetScaler ns.conf configuration file. This file contains highly sensitive information, including AAA/LDAP bind credentials and certificates. Adversaries may stage or exfiltrate this file following the exploitation of vulnerabilities (such as CVE-2026-88771 or CVE-2026-88772) on NetScaler appliances to facilitate further network compromise.
This rule detects potential post-exploitation activity on a NetScaler appliance where a crontab modification occurs within a short window (1 hour) following suspicious syslog entries indicative of oversized-parameter buffer overflow exploitation attempts (CVE-2026-88771/CVE-2026-88772).
This rule monitors network traffic from CommonSecurityLog data to detect bidirectional communication between NetScaler appliances and known malicious infrastructure associated with the CVE-2026-88772 campaign, which is indicative of command-and-control activity.
Detects evidence of the SLAPSHOT backdoor on Citrix NetScaler appliances by identifying specific ephemeral IPC files (/tmp/.uxdport and /tmp/.uxdlock) or the associated python-based launcher process that uses base64-encoded arguments to initialize the proxy daemon.
Detects the creation or modification of a local NetScaler administrative account with superuser (nsroot-level) privileges via the appliance CLI or management API. This activity is indicative of persistent administrative backdoors potentially established after the exploitation of vulnerabilities such as CVE-2026-88771 or CVE-2026-88772.
Detects core NetScaler service processes (nsppe, httpd, aslearning) initiating outbound network connections to external, non-private IP addresses. This behavior is indicative of post-exploitation C2 beaconing activity on a compromised NetScaler appliance.
This rule monitors network traffic from CommonSecurityLog data to detect bidirectional communication between NetScaler appliances and known malicious infrastructure associated with the CVE-2026-88772 campaign, which is indicative of command-and-control activity.
Detects unauthorized access to or generation of Citrix NetScaler core dump files, trace outputs, or memory diagnostic artifacts. These artifacts are high-value targets for attackers, such as those exploiting CVE-2026-88772, who attempt to extract session tokens, credentials, and sensitive data residing in memory via these diagnostic mechanisms.
Detects command-line activity attempting to disable, unbind, or remove NetScaler AppFW (Web Application Firewall) profiles, signatures, or security policies. This activity is indicative of defense evasion following the exploitation of CVE-2026-88771 or CVE-2026-88772 to suppress security alerting on follow-on malicious activity.
Detects command-line activity on a NetScaler appliance indicative of defense evasion by truncating, deleting, or disabling audit logs (ns.log) and syslog forwarding services. This activity often follows the exploitation of public-facing application vulnerabilities where an attacker seeks to hide their presence.
Detects repeated crashes or restarts of the Citrix NetScaler packet engine (nsppe) correlated with a concurrent spike in inbound DTLS traffic. This pattern is indicative of potential memory-overflow exploitation attempts (consistent with CVE-2026-88772) targeting the VPN virtual server functionality, leading to a Denial of Service (DoS) condition.
Identifies NetScaler ADC or Gateway software versions in the inventory that are known to be vulnerable to CVE-2026-88771 and CVE-2026-88772, despite having received the patch for CVE-2026-19490.
Identifies NetScaler ADC or Gateway software versions in the inventory that are known to be vulnerable to CVE-2026-88771 and CVE-2026-88772, despite having received the patch for CVE-2026-19490.
Detects high volumes of DTLS/UDP session-initiation traffic targeting NetScaler VPN virtual servers that are immediately followed by appliance-level error logs or crashes. This behavior is indicative of active probing or exploitation attempts, such as those associated with CVE-2026-88772, where malicious payloads cause service instability.
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.
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