Sigma detection rules, expert-reviewed

Linux Process Creation: Interactive Bash With Suspicious Command-Line and Child Image

Flags interactive bash (bash -i) spawning likely malicious children with encoded execution or recon/utility tool invocations.

Windows Process Creation: Suspicious for/foreach Scan Loop with nslookup or ping

Alerts on Windows command lines using for/foreach loops that also run nslookup or ping, consistent with host scanning.

Windows HackTool Process Patterns for CrackMapExec LSASS Dumping

Alerts on Windows command-line process patterns consistent with LSASS dumping in CrackMapExec workflows.

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 access indicating potential shellcode injection to lsass.exe

Alerts on high-privilege process access from wmiprvse.exe to lsass.exe consistent with potential shellcode injection behavior.

Windows: Executable Creates Executable via File Creation Events

Flags .exe-to-.exe executable drops on Windows when a running executable creates another .exe, with exclusions for common system/update paths.

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.