asn1.dll is a module belonging to Wireshark from The Wireshark developer community, http://www.wireshark.org/.
Non-system processes like asn1.dll originate from software you installed on your system. Since most applications store data on your hard disk and in your system's registry, it is likely that your computer has suffered fragmentation and accumulated invalid entries which can affect your PC's performance.
In Windows Task Manager, you can see what CPU, memory, disk and network utilization is causing the asn1 0.5.0.0 process. To access the Task Manager, hold down theCtrl+Shift+Esckeys at the same time. These three buttons are located on the far left of your keyboard.
The asn1.dll is an executable file on your computer's hard drive. This file contains machine code. If you start the software Wireshark on your PC, the commands contained in asn1.dll will be executed on your PC. For this purpose, the file is loaded into the main memory (RAM) and runs there as a asn1 0.5.0.0 process (also called a task).
asn1.dll has not been assigned a security rating yet. The asn1.dll file should be located in the folderC:Program Fileswiresharkplugins
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