Sigma detection rules, expert-reviewed

Windows Process Creation: Detect NTDS.DIT and Registry Hive Exfiltration Tooling

Detects suspicious Windows processes that reference NTDS.DIT/SYSTEM hive dumping or staging via common NTDS tooling and scripts.

Windows NTDS Exfiltration File Creation by NTDS Export Filename Patterns

Alerts on Windows file creates using common NTDS-DIT dump/exfiltration filename suffixes like \All.cab and .ntds.cleartext.

Windows Process Creation: OfflineScannerShell.exe mpclient.dll DLL Sideloading Risk

Detects OfflineScannerShell.exe launched with an unexpected current directory that could enable mpclient.dll sideloading.

Windows Process Creation: Replace.exe with -a argument

Detects Replace.exe executions that include the -a argument, which may be used for file replacement.

Windows Suspicious UltraVNC Command Line With Auto-Reconnect Flags

Alerts on UltraVNC execution using -autoreconnect with -connect and -id in the Windows command line.

PowerShell Base64 Encoded MpPreference Command Lines for Windows Defender Modification

Detects PowerShell Base64 command lines referencing Add-MpPreference/Set-MpPreference to modify Microsoft Defender AV settings.

Windows Hacktool Execution Flagged by Imphash in Process Creation

Alerts on Windows process executions where the import hash matches known hacktool binaries, even if renamed.

Windows PowerShell: Disable Microsoft Defender Scanning via Set-MpPreference

Flags PowerShell commands that disable Microsoft Defender scanning/protection settings using Set-MpPreference, including encoded variants.

Windows: fsutil SymlinkEvaluation behavior modification via command line

Alerts on fsutil commands from cmd/PowerShell that change NTFS SymlinkEvaluation behavior, potentially enabling remote symlink access.

Windows Process Creation: Base64-Obfuscated .NET Reflection Assembly Load Call

Alerts on command lines containing Base64-encoded obfuscation for .NET reflection assembly load calls.

Windows PowerShell: Base64 Encoded Reflective .NET Assembly Load

Flags PowerShell command lines containing Base64 fragments consistent with reflective .NET Assembly.Load usage.

Windows BITS Transfer Jobs Downloading Files with Suspicious Extensions

Flags Windows BITS transfers saving local files with high-risk script/executable extensions while excluding common benign patterns.

Windows BITS Job Creation Triggered by PowerShell

Flags new BITS job creation on Windows when initiated by PowerShell (Event ID 3).

Windows BITS job created by bitsadmin.exe (BITS Client EventID 3)

Alerts on new BITS job creation when bitsadmin.exe triggers it (BITS-Client EventID 3).

Windows PowerShell CommandLine downloads and executes via WebClient with IEX or DownloadFile

Alerts on PowerShell command lines that use WebClient downloads combined with IEX or DownloadFile, typical of staged payload execution.