Sigma detection rules, expert-reviewed

Web Exploitation Attempt Pattern for CVE-2020-5902 on F5 BIG-IP (URI Traversal)

Alerts on web requests with query patterns consistent with CVE-2020-5902 exploitation attempts targeting F5 BIG-IP.

Windows Process Execution of DIT Snapshot Viewer (ditsnap.exe)

Alerts on execution of the DIT snapshot viewer tool ditsnap.exe on Windows.

Windows Process Execution: Copy From System Directories to Other Locations

Detects cmd.exe, PowerShell, and copy utilities copying files from System32/SysWOW64/WinSxS to other locations on disk.

Windows desktopimgdownldr Suspicious URL and Registry Modification via Command Line

Flags desktopimgdownldr command lines indicating potential external file download or personalization registry deletion.

Windows curl.exe Suspicious Download to Local File Paths

Flags curl.exe executions on Windows that appear to download to local files in suspicious directories with risky file extensions.

Windows Desktop Image Downloader Targeting Lock Screen Images with Suspicious File Types

Alerts on desktopimgdownldr-style lock screen image target writes to non-system paths with suspicious filename characteristics.

Apache Guacamole Linux: Two-User Session Presence Anomaly

Flags Guacamole sessions on Linux when telemetry indicates two users are present, suggesting anomalous or suspicious session activity.

Windows: Detect curl.exe upload/data flags indicative of possible exfiltration

Detects curl.exe executions with upload/form/data flags on Windows that may indicate potential data exfiltration, excluding localhost targets.

Windows Registry Printer Driver Installations with Empty Manufacturer Field

Alerts on Windows registry printer driver environment updates where Manufacturer is set to empty.

PowerShell Classic bXOR Operator Usage in Command Line

Identifies PowerShell classic executions from ConsoleHost using the -bxor operator in the command line.

Windows AppLocker Blocked Application, Script, MSI, or Packaged-App Execution

Alerts on AppLocker event IDs showing blocked execution of apps, scripts, DLLs, MSI, or packaged apps.

Windows Security Log: Denied Remote Desktop Logon (Event ID 4825)

Flags Windows denied RDP connection attempts from users lacking permission to log on remotely (Event ID 4825).

Windows Registry Event Triggered by RedMimicry Winnti Playbook (HTMLHelp\data)

Alerts on Windows registry events targeting HKLM\SOFTWARE\Microsoft\HTMLHelp\data associated with the RedMimicry Winnti playbook.

Windows process execution matching Winnti RedMimicry playbook (rundll32/cmd with temp batch and gthread/sigcmm DLLs)

Flags rundll32.exe/cmd.exe launches with Winnti-specific DLL and temp batch indicators.

Suspicious WSMAN COM Provider Usage Without PowerShell Host (Windows)

Alerts on WSMAN COM provider activity where the host application is not PowerShell.exe in PowerShell Classic logs.