Sigma detection rules, expert-reviewed

Windows Service ImagePath Set to Non-Admin Controlled Directory

Alerts when a Windows service’s ImagePath is changed to a binary path under AppData or ProgramData.

Windows Process Creation: gpresult.exe Group Policy (RSoP) Discovery (/z /v)

Flags process executions of gpresult.exe that request RSoP details using /z and /v on Windows.

Windows svchost.exe RDP (3389) Connections to HTTP/HTTPS Ports 80 or 443

Alerts when svchost.exe initiates from TCP 3389 to destination ports 80 or 443, consistent with possible RDP tunneling over web ports.

Windows: Detect ngrok Traffic Forwarded to Local RDP Port via TerminalServices Logs

Detects suspicious ngrok usage that forwards to the local RDP port using Windows TerminalServices-LocalSessionManager EventID 21.

Windows rundll32.exe executing InstallScreenSaver via desk.cpl SCR File

Detects rundll32.exe launches with InstallScreenSaver behavior via desk.cpl, a screensaver execution technique.

Windows Microsoft Sync Center (mobsync.exe) Network Connections to Public IPs

Alerts when mobsync.exe makes outbound connections to destination IPs outside private/local ranges.

Windows: Copying Executable or DLL Files into Default GPO Policies Folder

Alerts when .exe/.dll files are created in the default GPO storage folder path.

Windows: Files created by Microsoft Sync Center (mobsync.exe) with .dll/.exe extensions

Flags .dll and .exe files created by mobsync.exe on Windows.

Windows: rundll32.exe spawning explorer.exe child process (shell32.Control_RunDLL)

Alerts on rundll32.exe spawning explorer.exe, an uncommon child process pattern that may indicate stealthy execution via shell components.

Windows Process Creation: KrbRelay.exe Kerberos Relay Tool Execution

Flags Windows process creation for KrbRelay.exe with Kerberos relaying-related command-line arguments.

Windows Hacktool Execution via PE Metadata Company Field

Flags execution of Windows binaries with PE Company metadata set to "Cube0x0", even when renamed.

Windows UAC Bypass via Event Viewer RecentViews File Creation

Alerts on suspicious file events to Event Viewer RecentViews paths that may indicate a Windows UAC bypass attempt.

Windows: Detect .SCR screen saver file creation outside common system directories

Alerts on creation of .scr screen saver files in unusual locations on Windows.

Windows Successful Local Kerberos Logon to Built-in Administrator (Possible Privilege Escalation)

Alert on successful local (127.0.0.1) Kerberos logons targeting the built-in Administrator SID for potential privilege escalation.

Windows: Detect KrbRelayUp.exe HackTool Process Execution

Flags Windows process executions of KrbRelayUp.exe with relay/domain and SCM spawn command-line patterns.