Sigma detection rules, expert-reviewed

Windows Service Install: NtsSrv (StoneDrill) via Service Control Manager Event 7045

Flags Windows service installs of NtsSrv by Service Control Manager with an ImagePath ending in " LocalService".

Suspicious PowerShell Script Block Invocations Using Encoded/Hidden Execution and Persistence Commands

Flags PowerShell script blocks using hidden/non-interactive execution, encoded/decode patterns, iex execution, web downloads, or run key modifications.

PowerShell ScriptBlock WebClient Download Calls

Alert on PowerShell ScriptBlock text that uses System.Net.WebClient to download files or strings from the Internet.

Windows PowerShell Script Block Logging: PSAttack marker string

Alerts when PowerShell script blocks contain the "PS ATTACK!!!" marker on Windows.

Windows PowerShell Script Block Contains Exploitation Framework and Credential Theft Keywords

Alerts on PowerShell script block text containing known exploitation, token, and memory-related keywords.

Windows PowerShell ScriptBlock detects known malicious commandlet names used by exploitation frameworks

Alerts when PowerShell ScriptBlock text includes strings matching known malicious commandlets from common exploitation toolsets.

Suspicious PowerShell Module Usage with Hidden/Encoded Execution Parameters on Windows

Flags hidden or encoded PowerShell invocations that decode/execute code or download-and-execute patterns, while filtering a Chocolatey installer snippet.

Suspicious PowerShell WebClient Downloads via PoshModule

Alerts on PowerShell module activity referencing System.Net.WebClient with DownloadFile/DownloadString calls to fetch remote content.

Windows PowerShell Execution via EngineVersion/HostVersion Mismatch in Command Start Telemetry

Detects PowerShell execution attempts that match a specific executable EngineVersion/HostVersion mismatch pattern on Windows.

PowerShell Net.WebClient DownloadFile/DownloadString Usage (Classic)

Flags PowerShell Classic commands using Net.WebClient to download content via DownloadFile or DownloadString.

Windows System Service Execution of Credential Dumping Tools (Service Control Manager Event 7045)

Flags Service Control Manager service creation with ImagePath names tied to credential dumping tools (Event ID 7045).

Windows Security EID 4697 Service Execution of Credential Dumping Tools

Alerts on Event ID 4697 service execution paths containing common credential dumping tool names on Windows.

Windows: Detects Access to ADMIN$ Network Share (Event 5140)

Alerts on Windows Security event 5140 entries where an access request targets the ADMIN$ share.

Windows process access targeting verclsid.exe with Office/VBA shellcode traces

Flags broad access to verclsid.exe from Microsoft Office/VBA contexts with VBE7.DLL call traces consistent with shellcode injection.

Linux Syslog Buffer Overflow Exploit Attempt Keywords

Alerts on Linux syslog entries containing known buffer overflow/stack-smashing attempt keyword patterns.