Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
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8,654 detections
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Detects a single source IP initiating network connections to 50 or more distinct destination ports within a 60-second window, which is indicative of an automated port scanning sweep. The rule correlates individual connection events while excluding pre-defined allowlisted vulnerability scanners.
KQL Query from file: ThreatFox IOC Hunt feed
Detects file system activity indicative of Royal and BlackSuit ransomware, specifically monitoring for the creation of ransom notes like 'README.TXT' or 'README.BlackSuit.txt' and mass renaming/encryption of files using extensions associated with these families (.royal, .royal_u, .blacksuit).
KQL Query
Detects modifications to Azure DevOps pipelines or service connections that include indicators of outbound tunneling or reverse proxy tools (e.g., ngrok, socat, chisel, or SSH reverse tunnels). This behavior is characteristic of an attacker attempting to establish a command-and-control channel or bypass firewall restrictions by tunneling traffic out of the CI/CD pipeline execution environment.
Detects incoming HTTP POST requests with unusually large payloads or malformed URI structures directed at Citrix NetScaler Gateway authentication endpoints, which are characteristic of exploitation attempts against CVE-2026-88771.
Detects the loading of WPF/XAML-related assemblies (PresentationFramework.dll, System.Xaml.dll, or PresentationCore.dll) by the SharePoint web server process (w3wp.exe). This behavior is highly irregular for typical SharePoint web worker processes and may indicate an exploitation attempt targeting deserialization vulnerabilities leading to remote code execution.
Detects bulk or frequent modifications to firewall policies across various network vendor devices, including Fortinet, Cisco Meraki, WatchGuard, and Sophos. The rule identifies high volumes of policy changes within a 15-minute window or logs summary counts to highlight potentially unauthorized administrative activity.
This rule monitors network appliance logs (Fortinet, Cisco, Meraki, WatchGuard, Sophos) for patterns associated with known vulnerabilities, including authentication bypass (CVE-2022-40684), SQL injection, path traversal, and command injection attempts within URL parameters. It also flags high-severity IPS/IDS alerts generated by these devices.
Detects the use of standard Linux command-line utilities (e.g., cat, curl, vi) to read or reference sensitive cloud credential files or Kubernetes service account tokens. This behavior is a common indicator of credential theft or discovery activities following initial access to a Linux host.
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