memory blocks

Are memory blocks actual viruses or just false alarms? I have read other posts on the issue and am confused. I had a pop up virus ocurr when I clicked on a news story, I am assuming from an ad. I recognized it and hard shut down the computer. I ran a boot scan and found a Java virus. When my weekly scan ran a few days later I had a memory block that has never appeared before. I ran another boot time scan, that came up clean. Then I ran Malwarebytes and it was also clean. Advice?

Process 2552 hkcmd.exe memory block, severity high Threat Win32:Malware-gen

in your weekly scan…is this a custom scan?
have you changed the default scan settings…and selected “scan memory” ?

Product: Intel(R) Common User Interface *1
Company: Intel Corporation *1
Description: hkcmd Module *1
Version: 6.14.10.4926 *1
MD5: 004763BDF8E48244DBB9FDFDE3065EBC *1
Size: 173592 *1
Directory: %SYSDIR%\hkcmd.exe *1
Operating System: Windows 7 *1

Yes this was a weekly scan, and yes it was customized to scan memory as well. However, I have not changed the settings of my custom scan since I started using Avast several months ago after receiving high recommendations from other users. It is a new “virus” that shows up. It has appeared in the last 2 weekly scans, but never before that.