Rasautou.exe

Windows Remote Access Dialer

Paths

• C:\Windows\System32\rasautou.exe

Commands

Execute

Loads the target .DLL specified in -d and executes the export specified in -p. Options removed in Windows 10.

Use case: Execute DLL code

Privileges: User, Administrator in Windows 8

rasautou -d {PATH:.dll} -p export_name -a a -e e

Detection

• Sigma: https://github.com/SigmaHQ/sigma/blob/08ca62cc8860f4660e945805d0dd615ce75258c1/rules/windows/process_creation/win_rasautou_dll_execution.yml
• IOC: rasautou.exe command line containing -d and -p

Resources

• https://github.com/fireeye/DueDLLigence
• https://www.fireeye.com/blog/threat-research/2019/10/staying-hidden-on-the-endpoint-evading-detection-with-shellcode.html