Sigma detection rules, expert-reviewed

Windows: Suspicious Process Spawn by Outlook Parent

Alerts on Windows process launches where Outlook.exe spawns known high-risk command execution binaries.

Windows Registry: Enable Microsoft DDE in Word or Excel Security Settings

Detects registry changes that enable or permit DDE server launch/lookup for Word or Excel.

Suspicious wuauclt.exe Process Creation on Windows with Empty Command-Line Flags

Alert on Windows Update Agent wuauclt.exe launches that have command lines ending with no flags/arguments.

Windows: Suspicious Parent Process Execution From \Users\Public Spawning Scripting/Shell Binaries

Alerts on processes launched from \Users\Public that execute common scripting/shell binaries or command-line markers.

Windows: ScreenConnect Client Service Spawning Suspicious Utility Commands

Alerts when ScreenConnect run.cmd leads to child processes like cmd.exe, PowerShell, curl, or other utilities.

Windows process creation: CrackMapExec execution via characteristic command-line flags

Alerts on Windows process creation showing CrackMapExec-style command-line flags for local auth and module execution.

Windows MSExchangeMailboxReplication .aspx/.asp File Writes Indicating Web Shell Upload

Alerts when MSExchangeMailboxReplication.exe writes .asp or .aspx files on Windows, indicating potentially malicious server-side script drops.

Windows Registry: Disable CrashDump via CrashControl DWORD value

Alerts on registry changes that disable Windows crash dumps by writing 0x00000000 to CrashControl.

Windows Scheduled Task Creation via schtasks with Suspicious Command-Line Patterns

Flags schtasks.exe /Create commands containing suspicious interpreter, encoding, hidden execution, or unusual path/script components.

Windows explorer.exe spawned with /NOUACCHECK flag for UAC bypass behavior

Alerts on explorer.exe executions that include /NOUACCHECK, indicating potential bypass of UAC checks for child processes.

Windows Schtasks.exe Task Creation Targeting Suspicious Paths or Env Variables

Alerts when schtasks.exe creates tasks whose target path/arguments reference suspicious folders or common environment variables.

Windows CHCP Console Code Page Lookup Triggered From cmd.exe

Flags cmd.exe-launched chcp.com executions likely used to query system code page/locale for discovery.

Suspicious Reset-ComputerMachinePassword Usage via PowerShell on Windows

Detects PowerShell executions of Reset-ComputerMachinePassword that may indicate attempts to alter domain computer account authentication.

Windows Process Execution of Tor or Tor Browser (tor.exe / Firefox-based)

Flags Windows execution of tor.exe or Tor Browser’s bundled Firefox from the expected installation path.

Windows Sysmon DNS Query to .onion or Tor Gateway Domains

Alerts when Windows Sysmon DNS queries target .onion or Tor gateway/proxy-related domain suffixes.