Ibrahim Saud
@tektrixIndiaCompletionist
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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.
Detects the execution of suspicious child processes (shells, interpreters, or system reconnaissance tools) directly spawned by critical Citrix NetScaler service binaries (nsppe, httpd, nsaaad). This behavior is indicative of post-exploitation activity, such as command injection or lateral movement following the exploitation of a public-facing NetScaler application vulnerability.
Detects instances where Windows Terminal (wt.exe) is used to spawn PowerShell or pwsh as a child process. This pattern may be indicative of ClickFix-style social engineering attacks where users are deceived into pasting or executing malicious commands within a terminal environment.
This rule monitors NetScaler Syslog events for file creation or modification actions targeting web-accessible directories (/netscaler/, /var/vpn/, /var/netscaler/logon/) involving common web shell scripting extensions (.php, .pl, .sh, .py). It is designed to detect post-exploitation activity such as the manual deployment of backdoors following a vulnerability compromise.
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 unauthorized access to sensitive browser credential and session data files (e.g., Login Data, Cookies, Local State, key4.db) by non-browser processes. This behavior is a common indicator of information-stealing malware attempting to extract saved credentials and session cookies to facilitate account takeover and bypass multi-factor authentication.
Detects the spawning of shells, interpreters, or system reconnaissance binaries by primary Citrix NetScaler ADC/Gateway processes (httpd, nsppe, aslearning). This behavior is strongly indicative of post-exploitation activity, such as remote command execution, often following the exploitation of vulnerabilities like CVE-2026-88771.
Detects the creation or modification of system users and groups on NetScaler ADC/Gateway appliances by monitoring Syslog events (e.g., nsconmsg, audit logs). The rule specifically triggers when these actions occur outside of standard business hours or on weekends, indicating potential unauthorized account manipulation or unauthorized persistence mechanisms.
Detects high-frequency, short-duration UDP flow activity on NetScaler VPN ports (443/4433) indicative of volumetric or malformed DTLS handshake probing, potentially associated with exploitation attempts like CVE-2026-88772.
Detects an attempt to exploit CVE-2026-88772 by identifying an oversized DTLS handshake record on a NetScaler Gateway. The rule looks for UDP traffic on port 443 where the initial handshake record exceeds the expected size threshold, indicative of a potential buffer overflow attempt.
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