Sigma rule: DLL Execution via Rasautou.exe

Rule

Title

DLL Execution via Rasautou.exe

Status

test

Level

medium

Author

Julia Fomina, oscd.community

Date

2020-10-09

File

rules/windows/process_creation/proc_creation_win_lolbin_rasautou_dll_execution.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects using Rasautou.exe for loading arbitrary .DLL specified in -d option and executes the export specified in -p.

Log source

product

windows

category

process_creation

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 (as the rule lists them)

• Unlikely

Tags

• attack.stealth
• attack.t1218

MITRE ATT&CK ids this rule names

• T1218

References

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

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_lolbin_rasautou_dll_execution.yml