Detectionhightest

.RDP File Created By Uncommon Application

Detects creation of a file with an ".rdp" extension by an application that doesn't commonly create such files.

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

Nasreddine Bencherchali (Nextron Systems)Created Tue Apr 18Updated Fri Nov 01fccfb43e-09a7-4bd2-8b37-a5a7df33386dwindows

Log Source

WindowsFile Event

ProductWindows← raw: windows

CategoryFile Event← raw: file_event

Events for file system activity including creation, modification, and deletion.

Detection Logic

detection:
    selection:
        TargetFilename|endswith: '.rdp'
        Image|endswith:
            # Covers browsers
            - '\brave.exe'
            - '\CCleaner Browser\Application\CCleanerBrowser.exe'
            - '\chromium.exe'
            - '\firefox.exe'
            - '\Google\Chrome\Application\chrome.exe'
            - '\iexplore.exe'
            - '\microsoftedge.exe'
            - '\msedge.exe'
            - '\Opera.exe'
            - '\Vivaldi.exe'
            - '\Whale.exe'
            # Covers email clients
            - '\olk.exe' # Outlook
            - '\Outlook.exe'
            - '\RuntimeBroker.exe' # If the windows mail client is used
            - '\Thunderbird.exe'
            # Covers chat applications
            - '\Discord.exe' # Should open the browser for download, but just in case.
            - '\Keybase.exe'
            - '\msteams.exe'
            - '\Slack.exe'
            - '\teams.exe'
    condition: selection