AV-TEST CEO Andreas Marx says that the different strains of malware mostly contain recompiled versions of the same proof-of-concept code released with the initial report on the bugs.
It doesn't appear that any of the exploits work yet, but it's clear that malware authors are working to actively exploit Meltdown and Spectre.
Marx believes different groups are working on the PoC exploits to determine if they can be used for some purpose. "Most likely, malicious purposes at some point," he said.
The expert believes the current malware samples are still in the "research phase" and attackers are most likely looking for ways to extract information from computers, particularly from web browsers. He would not be surprised if we started seeing targeted and even widespread attacks in the future.
Malware Exploiting Spectre, Meltdown Flaws Emerges [Eduard Kovacs/Securityweek]