Sigma detection rules, expert-reviewed

FortiGate User Group Modified via Edit Event

Alerts on FortiGate user group edits that can change access permissions, including VPN-related group membership.

FortiGate: Addition of VPN SSL Web Portal via Event Logs

Detects FortiGate configuration events where a VPN SSL web portal is added.

FortiGate: Local User Added via CLI Event

Alerts on FortiGate events where a new local user is added under user.local.

FortiGate: Alert on Added Firewall Policy via Event Log

Flags FortiGate events where a firewall policy is added (action Add on firewall.policy).

FortiGate Firewall Address Object Added (event action Add)

Alerts when a FortiGate firewall address object is added via configuration change events.

FortiGate: Administrator Account Added via system.admin Events

Alerts on FortiGate events that add a new administrator account in system.admin.

Windows Application Logs: Detect WSUS deserialization exploitation via InvalidCastException indicators

Flags WSUS (EventID 7053) application log errors matching invalid cast/object data provider strings indicative of CVE-2025-59287 exploitation.

Windows Process Creation: Suspicious cmd.exe or PowerShell Child of WSUS (wsusservice.exe)

Alerts when WSUS/IIS service processes spawn cmd or PowerShell interpreters, indicating potential exploitation and post-exploitation activity.

Windows Registry Add WFP Filter Rules via BFE Parameters Path

Alerts on registry changes adding persistent WFP filters under the BFE policy persistent filter path via svchost.exe.

Windows SpeechRuntime.exe Child Process Creation

Alerts when SpeechRuntime.exe spawns a child process, highlighting potential abuse for lateral movement on Windows.

Windows process creation: child process spawned by winrshost.exe

Flags Windows process children of winrshost.exe that may indicate WinRS-driven remote command execution.

Windows Winrs.exe Local Command Execution via localhost/loopback

Alerts on Winrs.exe processes running locally by targeting localhost/loopback in /r or /remote.

AWS CloudTrail: TruffleHog User-Agent Execution Detected

Flags AWS CloudTrail events with user agent "TruffleHog" to surface potential secret-scanning or credential-harvesting activity.

Windows Suspicious File Write to Apache/Tomcat webapps ROOT (.jsp) by Web Server Processes

Alerts on .jsp writes into Apache/Tomcat webapps ROOT from dotnet/java/IIS worker processes on Windows.

Windows Process Creation: Commvault qlogin Argument Injection Indicators for Auth Bypass

Alerts on Windows command lines running Commvault qlogin with -localadmin-related markers consistent with argument injection.