1)
Never detected anything. If these "attacks" were really "infective" and went through my firewall shouldn`t I have found something during my scans?
2)
Also, these attacks started the moment I updated my Avast.
Hi,
please read up on BLASTER, SASSER, DCOM & LSASS-Exploits here on the board, at microsoft or basically any security-related website, to know how Network-worms work and use avast help or board-search to see how avast new NETWORK-SHIELD works (if it alerts you, it caught & blocked something: it's not over-sensitive)
you didn't get infected because
- either you have all Windowsupdates/patches against these exploits in place (in which case they can't do you no harm - so far) or
- because your firewall DID block them
2) Nope... they have been happening since 2003 or thereabouts but you didn't see them because either your firewall blocked them, or you were protected by WindowsUpdates (see 1)
And only since avast has incorporated its new NETWORK-Shield in v4.5 you get alerted to those attacks.
(you can switch of the WAYRNINGS in the networkshield options, without losing the protection)
And where/if they appear (avast/or FW) depends on whether avast's Network-Shield or Firewall gets loaded first on Windows startup
(and of course it depends on whether your FW is configured correctly and if you can interpret its logs
)