DLL Execution via Rasautou.exe
Detects using Rasautou.exe for loading arbitrary .DLL specified in -d option and executes the export specified in -p.
Convert In Phoenix Studio
Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.
Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.
Definition
Since options '-d' and '-p' were removed in Windows 10 this rule is relevant only for Windows before 10. And as Windows 7 doesn't log command line in 4688 by default, to detect this attack you need Sysmon 1 configured or KB3004375 installed for command-line auditing (https://support.microsoft.com/en-au/help/3004375/microsoft-security-advisory-update-to-improve-windows-command-line-aud)
detection:
selection_img:
- Image|endswith: '\rasautou.exe'
- OriginalFileName: 'rasdlui.exe'
selection_cli:
CommandLine|contains|all:
- ' -d '
- ' -p '
condition: all of selection*False positives are unlikely for most environments. High confidence detection.
Tactics
Techniques