cmdl32.exe

Commands

1. DownloadUser T1105

   Download file from Internet

   cmdl32 /vpn /lan %cd%\config

   Download a file from the web address specified in the configuration file. The downloaded file will be in %TMP% under the name VPNXXXX.tmp where “X” denotes a random number or letter.

   os: Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11

Detection

• Sigma https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_lolbin_cmdl32.yml
• IOCReports of downloading from suspicious URLs in %TMP%\config.log
• IOCUseragent Microsoft(R) Connection Manager Vpn File Update

Resources

• https://github.com/LOLBAS-Project/LOLBAS/pull/151
• https://twitter.com/ElliotKillick/status/1455897435063074824
• https://elliotonsecurity.com/living-off-the-land-reverse-engineering-methodology-plus-tips-and-tricks-cmdl32-case-study/