Home HOW-TO How to know what a DLL file does ? Step by Step Tutorial

How to know what a DLL file does ? Step by Step Tutorial

by Cengiz Kuskaya

There can be troubleshooting, forensic or reverse engineering scenarios where the IT Pros, Engineers or Developers needs to know what a DLL file does.

In this tutorial I will explain how you can figure out what a DLL file does and how you can easily figure out inside which DLL a specific software feature is included.

There are definitely lots of methods you can use but Dependency Walker is one of the best and legendary programs which you can use to figure out the functions available inside a DLL File. Functions have mostly selfdescribing and meaningfull names therefore the name should be enough to get an overview of the DLL file.

1. Figure out what a DLL file is doing :

Dependency Walker
As you can see in the analysis and screenshot below we are analyzing the Spoolss.dll file. From the function names we can understand that the DLL file is the spooler services router DLL file. Basicaly responsible for routing the spool files to the remote and local printers.

2. Figure out in which DLL file a specific software feature is included or responsible :

Agent Ransack
To do this you can use the free Tool named Agent Ransack from Myhticsoft. It’s able to search for strings inside DLL files. You can basically type the related feature name into the Containing text box and search for that string inside that related Program Application folder.


Good luck !

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