Sigma detection rules, expert-reviewed

Windows Malicious Driver Load by Known Hashes

Alerts on Windows driver loads matching known malicious driver hashes (MD5/SHA1/SHA256/IMPHASH).

Windows Executable Connections to Dead Drop Resolver Domains Excluding Common Browsers

Flags non-browser Windows executables making outbound connections to known dead-drop resolver domain patterns.

Windows: Detect Microsoft Office DLL sideloading via ImageLoad of outllib.dll from nonstandard path

Alerts on outllib.dll loads from non-standard locations rather than typical Microsoft Office directories.

Sysmon FileBlockExecutable event: blocked executable execution attempts on Windows

Alerts when Sysmon blocks an attempted executable execution due to FileBlockExecutable policy violations.

Windows Process Creation: mshtml.dll RunHTMLApplication Execution via Protocol Handlers

Alerts on Windows command lines invoking mshtml.dll RunHTMLApplication (via #135) with path traversal markers.

Windows DLL Sideloading: System DLL Names Loaded from Non-Standard Paths (ImageLoad)

Alerts when Windows image loads DLL names typically found in system locations, excluding common benign paths to reduce false positives.

Windows rundll32 Loading Renamed comsvcs.dll via DLL Image Load

Flags rundll32.exe loading a renamed comsvcs.dll module consistent with process memory dumping behavior on Windows.

Windows: Unusual Process Tree for wab.exe and wabmig.exe

Alert on abnormal parent/child process relationships involving wab.exe and wabmig.exe in Windows process creation logs.

Windows Process Creation: wab.exe or wabmig.exe Run from Non-Default Paths

Alerts when wab.exe or wabmig.exe run from unexpected directories on Windows.

Windows: findstr.exe LSASS keyword matching for process reconnaissance

Alert on find.exe/findstr.exe command lines containing "lsass", indicating potential LSASS-focused reconnaissance.

Windows file write events where executables save files with suspicious script/binary extensions

Alerts when common Windows system executables write files ending in suspicious extensions like .ps1, .bat, .vbs, or .hta.

Windows Malicious iphlpapi.dll Dropped in OneDrive/Teams AppData Directory

Flags creation of iphlpapi.dll in the Microsoft AppData area used by OneDrive/Teams, consistent with DLL sideloading attempts.

Webserver URI Probe for Workspace ONE Access Auth Bypass Attempt (CVE-2022-31656)

Alerts on webserver requests to Workspace ONE Access containing a URI query pattern linked to CVE-2022-31656 exploitation.

Azure AD Account Created and Deleted Shortly After Creation (Audit Logs)

Identifies successful Azure user creation and deletion in quick succession, consistent with short-lived account activity.

Windows Registry: Change to Services\WinSock2\Parameters\AutodialDLL for DLL Persistence

Alerts on registry changes to AutodialDLL under WinSock2 parameters that may enable DLL-based persistence.