This rule detects network events that may indicate the use of Telnet traffic. Telnet is commonly used by system administrators to remotely control older or embedded systems using the command line shell. It should almost never be directly exposed to the Internet, as it is frequently targeted and exploited by threat actors as an initial access or backdoor vector. As a plain-text protocol, it may also expose usernames and passwords to anyone capable of observing the traffic.

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This rule correlate any Elastic Defend alert with a set of suspicious events from Network security devices like Palo Alto Networks (PANW), Fortinet Fortigate and Suricata by host.ip and source.ip. This may indicate that this host is compromised and triggering multi-datasource alerts.

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This rule detects Suricata high severity alerts that are observed for the first time in the previous 5 days of alert history. Analysts can use this to prioritize triage and response.

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This rule identifies network security alerts related to CVE-2025-55182 exploitation attempts from different network security integrations. CVE-2025-55182 is a critical remote code execution vulnerability in React Server Components (RSC) Flight protocol. The vulnerability allows attackers to execute arbitrary code on the server by sending specially crafted deserialization payloads that exploit prototype chain traversal to access the Function constructor.

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Detects a POST to the Splunk Enterprise PostgreSQL backup endpoint followed by a POST to the restore endpoint from the same client to the same host within a 15-minute window. This sequence is unusual and can align with the public CVE-2026-20253 pre-authentication RCE chain, where an attacker stages a database dump via the backup path and executes attacker-controlled SQL via the restore path.

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Detects CVE-2026-20253 exploit artifacts against the Splunk Enterprise PostgreSQL sidecar recovery endpoints via complementary signals. Where endpoint or Network Packet Capture request-body logging is available, the rule matches PostgreSQL connection-string injection keywords, suspicious backupFile destinations, and known filesystem artifacts used to pivot from backup/restore primitives to file write or RCE. It also detects vulnerable recovery endpoint probing and empty-password Basic auth credentials observed in public exploit tooling.

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This detection correlates Suricata alerts with Elastic Defend network events to identify the source process performing the network activity.

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