diff --git a/rules/windows/process_creation/win_rasautou_dll_execution.yml b/rules/windows/process_creation/win_rasautou_dll_execution.yml new file mode 100644 index 00000000..fef616b2 --- /dev/null +++ b/rules/windows/process_creation/win_rasautou_dll_execution.yml @@ -0,0 +1,30 @@ +title: DLL Execution via Rasautou.exe +id: cd3d1298-eb3b-476c-ac67-12847de55813 +description: Detects using Rasautou.exe for loading arbitrary .DLL specified in -d option and executes the export specified in -p. +status: experimental +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 +author: Julia Fomina, oscd.community +date: 2020/10/09 +tags: + - attack.defense_evasion + - attack.t1218 +logsource: + 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: + use_rasautou: + Image|endswith: '\rasautou.exe' + remaned_rasautou: + OriginalFileName: 'rasdlui.exe' + special_keys: + CommandLine|contains|all: + - '-d' + - '-p' + condition: (use_rasautou or remaned_rasautou) and special_keys +level: medium +falsepositives: + - Unlikely