If I recall both Hitman Pro and Panda Cloud do this.
I'm trying to find out if any of the online scanners scan the memory for malware. I went to the home pages of the top rated ones, but none of them said anything about a memory scan.
I'm trying to find out if the memory on both my computers are infected "as per an Avast scan" or are just definitions from another malware program. In this case MalwareBytes, as stated by the Avast help section.
I can't see spending 15 to 20 minutes per computer downloading definitions only to find that it doesn't scan the memory.