Sigma detection rules, expert-reviewed

Windows rundll32 WebDAV Client Execution (davclnt.dll DavSetCookie)

Flags svchost.exe spawning rundll32.exe to run davclnt.dll,DavSetCookie, consistent with WebDAV client execution.

PowerShell Get-Clipboard Cmdlet Execution via CLI on Windows

Flags Windows command lines containing Get-Clipboard, indicating potential clipboard data collection via PowerShell.

Windows PowerShell Get-Clipboard Command Execution

Flags PowerShell activity that includes the Get-Clipboard command, which may be used to collect clipboard contents.

PowerShell Decompress via Expand-Archive

Alerts on PowerShell usage of Expand-Archive, a common decompression step attackers may use to unpack files.

Windows Startup Directory File Writes for Persistence

Alerts on file writes into the Windows Startup folder that may indicate user-level persistence.

Windows File Deletion Using Sysinternals SDelete (SDelete rename suffixes)

Flags Windows file deletions targeting filenames ending in .AAA or .ZZZ consistent with SDelete-style artifact removal.

Windows findstr Launches .lnk via Command Line

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

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.

PowerShell Local User Creation via New-LocalUser

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

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.

Windows Security Event 4662: Non-Machine Account Reads Domain User Object Properties

Alert on AD user property read attempts in Windows Event 4662 from non-machine accounts.