Sigma detection rules, expert-reviewed

Windows Image Load of System.Drawing.ni.dll

Alerts when a Windows process loads System.Drawing.ni.dll, which may indicate visual data collection activity.

Windows PFX File Creation From File Events

Flags Windows file events where a .pfx (certificate + private key) is created, excluding a few common benign locations.

Windows findstr Launches .lnk via Command Line

Flags find.exe or findstr.exe processes whose command lines end with a .lnk file.

WebDAV Delivery of Executable Files over HTTP (Zeek)

Flags Zeek HTTP events where WebDAV traffic serves an .exe with MIME type 'dosexec'.

Windows winget Installs Applications Using Local Manifest File

Flags winget.exe install commands that specify a local manifest file via -m/--manifest.

Windows Process Command Lines Writing Malicious Files to C:\Windows\Fonts

Flags Windows command lines that create or copy files into C:\Windows\Fonts\ using suspicious file extensions.

Windows Netsh.exe WLAN profile key clearing used for WiFi credential harvesting

Detects netsh.exe command-line activity targeting WLAN and clearing keys, indicative of potential WiFi credential harvesting on Windows.

Windows: Process Execution of Suspicious hxtsr.exe (Outside WindowsApps)

Alerts when hxtsr.exe runs from a non-expected WindowsApps Microsoft.WindowsCommunicationsApps location.

AWS CloudTrail EC2 CreateInstanceExportTask Failure

Flags failed EC2 VM export task creation events in AWS CloudTrail to surface potential instance data extraction attempts.

Proxy Downloads Containing /pwndrop/ (PwnDrp Web Server)

Alerts on proxy requests to URIs containing '/pwndrop/', consistent with PwnDrp-style web delivery.

PowerShell Local User Creation via New-LocalUser

Flags PowerShell usage of New-LocalUser, indicating creation of a Windows local user.

Zeek SMB: Network Share File Transfers of Credential-Related Filenames

Flags Zeek-observed SMB share file transfers involving credential/dump-related filenames.

Zeek SMB File Access to Sensitive Email/Database/Backup Extensions

Alerts on Zeek-observed SMB file accesses to filenames ending with high-value sensitive extensions.

Windows: Alert on Suspicious HH.EXE Process Execution

Alerts on HH.exe execution where the command line references temp, downloads, Outlook, or other writable directories.

Windows Process Creation: Suspicious Children Spawned by HTML Help (hh.exe)

Flags HH.exe spawning CertReq/CertUtil/CMD/PowerShell/cscript/regsvr32/mshta and other common Windows execution utilities.