The most useless software in the world
I'll proceed to rip clamav from every mail server I manage (and there are a lot of them, sadly) because while it has been more or less useless (hit/miss ratio is sooooo low) now it's also plainly dangerous.
Antivirus software is supposed to be an important part of an organization's defense against the endless tide of malware. Cisco's open source ClamAV can fill that role – once you patch the 9.8/10 rated arbitrary code execution flaw the networking giant revealed on Wednesday. "A vulnerability in the HFS+ partition file parser …
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My mail-server runs ClamAV and it stops 3/4 of all malware and virus deliveries, I stop the remaining 25% by quarantining all emails with potential infectious attachments e.g. Purchase Order.exe and Purchase Order_pdf (2).rar - two examples from this morning's deleted list.