Sigma detection rules, expert-reviewed

Windows PowerShell Invoke-WebRequest Download to Suspicious Paths

Alert when PowerShell uses Invoke-WebRequest/aliases with download flags and targets suspicious file locations.

Windows: Detect VMwareXferlogs.exe Executed from Non-default Path

Alert on VMwareXferlogs.exe launching from an unexpected directory, a potential DLL sideloading technique on Windows.

Windows mpclient.dll Sideloading via MpCmdRun.exe or NisSrv.exe from Non-Default Paths

Alerts when mpclient.dll is loaded by MpCmdRun.exe or NisSrv.exe outside known Windows Defender directories.

Windows: Potential DLL sideloading via VMwareXferlogs loading glib-2.0.dll from non-standard path

Alerts on VMwareXferlogs.exe loading glib-2.0.dll from outside the default VMware directory.

Windows Code Integrity blocks unsigned DLL loads into MpCmdRun.exe and NisSrv.exe

Flags security-mitigations events where MpCmdRun or NisSrv are prevented from loading unsigned DLLs.

Windows Registry Set to Disable Windows Defender Components

Flags registry changes that turn off Windows Defender protections via Defender and Security Center policy keys.

Windows Registry: Attachment Manager policy tampering via Attachments settings values

Detects registry changes to Windows Attachment Manager policy values that can disable or alter download safety controls.

Windows Registry Tampering: Attachment Manager Associations Default File Type Risk and LowRiskFileTypes

Flags Windows registry changes to Attachment Manager associations that set DefaultFileTypeRisk and modify LowRiskFileTypes.

Windows Registry Change Disabling WinDefend Service (WinDefend Start=4)

Flags registry changes that set WinDefend service Start to 0x4, indicating potential defensive impairment.

Windows Registry AutoLogger Session Disable/Start Tampering via Event Log Targets

Alerts when registry changes disable or stop AutoLogger sessions for EventLog-* or Defender by setting Enabled/Start to 0x0.

Windows sc.exe Service StartupType Change to Disabled or Demand

Flags sc.exe commands that change a Windows service startup type to disabled or demand.

Windows reg.exe importing .reg files from common user and temp directories

Flags reg.exe importing .reg files when the command line references user or temp directories.

Windows reg.exe deletes service registry keys using the delete flag

Alerts on reg.exe command lines that delete entries under the Windows services registry path.

Windows query.exe used to enumerate sessions and processes (possible data exfil staging)

Detects query.exe runs that request session and process output, matching patterns consistent with staged data collection.

Windows Defender mpclient.dll Side-loading: MpCmdRun.exe or NisSrv.exe from Non-Default Paths

Alerts when MpCmdRun.exe or NisSrv.exe runs from non-default directories, a common indicator of possible mpclient.dll sideloading.