An interesting story on Slashdot this morning is about a Brazilian report [and here in the original Portuguese] into the effectiveness of free anti-virus software against non-English threats. Admittedly, they only tested six, all of which were free, but the results were pretty disappointing, especially compared to a set of independent statistics (taken from “Virus Bulletin“):
|Name||% detected (in the report)||% detected (independent stats1)|
|Microsoft Security Essentials||13.4%||87.1%|
1 These results are from 2009, but give an indication.
So, there are a number of things to draw from this, aside from the fact that no paid-for software was tested. Even if there is a large margin of error, the discrepancy in the results is quite stark and might make large organisations, particularly multi-nationals, re-consider their AV protection. What works in one part of the world may not be quite so effective in another.
It’s also worth mentioning that most anti-virus products will use a variety of techniques to detect malicious software, from signatures to heuristics and these results will almost certainly not reflect real-world detection rates if everything is turned on and additional software, like firewalls and anti-spyware products are used.