Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
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KQL Query from file: ClickFix RAT – Malicious MSI Execution
This rule detects potential exploitation attempts targeting the Splunk REST API (CVE-2026-20253) by monitoring for unauthenticated inbound requests to the /services/ path. It specifically looks for requests that lack the required Authorization or Cookie headers.
Detects network traffic matching the default HTTP check-in pattern of Mythic C2 agents. This rule monitors for POST requests using a specific hardcoded User-Agent string and Content-Type header commonly used in default Mythic agent configurations, indicating a potential active command-and-control session.
Detects the abuse of WerFaultSecure.exe or similar Windows Error Reporting processes, invoked with debugging or dumping flags against security/EDR process names, or spawned by unexpected parent processes. This technique is often used to freeze security tools (EDR-Freeze) by exploiting process suspension via mini-dump handles.
Detects incoming web server requests containing suspicious, URL-encoded SQL injection patterns indicative of automated probing or exploitation attempts, such as UNION SELECT, boolean-based injection fragments, and comment sequences.
This rule detects a high frequency of SMB (port 445) connection attempts from a single internal source host to a large number of distinct internal destination hosts within a short timespan. This activity is indicative of internal network scanning, host discovery, or automated lateral movement attempts using SMB.
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.
Detects unauthorized attempts to access the Ray Dashboard Job Submission API, which is vulnerable to remote code execution (CVE-2023-48022). Attackers can leverage this API endpoint to execute arbitrary commands on the Ray cluster.
Detects potential SQL injection attempts targeting Cisco AsyncOS Email Gateways via the SMTP DATA command. The rule monitors for malicious patterns, specifically those attempting to execute unauthorized commands or database queries (such as COPY TO PROGRAM or embedded SQL statements) within SMTP traffic.
Detects unauthorized POST requests to SharePoint WebPart gallery pages that lack valid authentication cookies, which may indicate exploitation of CVE-2026-65660. The rule monitors for POST methods to specific SharePoint pages while excluding requests that already contain standard SharePoint authentication cookies (FedAuth, rtFa).
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