Ieadvpack.dll

INF installer for Internet Explorer. Has much of the same functionality as advpack.dll.

Paths

• c:\windows\system32\ieadvpack.dll
• c:\windows\syswow64\ieadvpack.dll

Commands

AWL Bypass

Execute the specified (local or remote) .wsh/.sct script with scrobj.dll in the .inf file by calling an information file directive (section name specified).

Use case: Run local or remote script(let) code through INF file specification.

Privileges: User

rundll32.exe ieadvpack.dll,LaunchINFSection {PATH_ABSOLUTE:.inf},DefaultInstall_SingleUser,1,

AWL Bypass

Execute the specified (local or remote) .wsh/.sct script with scrobj.dll in the .inf file by calling an information file directive (DefaultInstall section implied).

Use case: Run local or remote script(let) code through INF file specification.

Privileges: User

rundll32.exe ieadvpack.dll,LaunchINFSection {PATH_ABSOLUTE:.inf},,1,

Execute

Launch a DLL payload by calling the RegisterOCX function.

Use case: Load a DLL payload.

Privileges: User

rundll32.exe ieadvpack.dll,RegisterOCX {PATH:.dll}

Execute

Launch an executable by calling the RegisterOCX function.

Use case: Run an executable payload.

Privileges: User

rundll32.exe ieadvpack.dll,RegisterOCX {PATH:.exe}

Execute

Launch command line by calling the RegisterOCX function.

Use case: Run an executable payload.

Privileges: User

rundll32 ieadvpack.dll, RegisterOCX {CMD}

Detection

• Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_rundll32_susp_activity.yml
• Splunk: https://github.com/splunk/security_content/blob/86a5b644a44240f01274c8b74d19a435c7dae66e/detections/endpoint/detect_rundll32_application_control_bypass___advpack.yml

Resources

• https://bohops.com/2018/03/10/leveraging-inf-sct-fetch-execute-techniques-for-bypass-evasion-persistence-part-2/
• https://twitter.com/pabraeken/status/991695411902599168
• https://twitter.com/0rbz_/status/974472392012689408