Sigma detection rules, expert-reviewed

Windows AppCompatFlags Store New Application Registry Entries

Alerts on new writes to the AppCompat Compatibility Assistant store registry path, indicating first-time application behavior.

Windows Registry Deletion of Shell Open Command COM Hijacking Key Paths

Flags registry deletions of \shell\open\command paths that may indicate removal of COM hijacking execution entries.

Windows sdclt.exe Spawned with High Integrity (Possible UAC Bypass)

Alerts on sdclt.exe launching as High integrity, indicating possible elevated execution consistent with UAC bypass attempts.

Windows Process Creation: .NET ETW Logging Environment Variables Set via Command Line

Flags process command lines setting COMPlus_ETWEnabled/COMPlus_ETWFlags, potentially impairing ETW logging for .NET.

Windows sdclt.exe Child Process Creation

Alerts when sdclt.exe launches a child process, a behavior consistent with abused Windows binaries in escalation chains.

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.

Zeek: Detect WebDAV User-Agent with HTTP PUT to local or RFC1918 addresses

Flags Zeek HTTP PUT requests with a WebDAV User-Agent that target non-excluded network addresses.

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.