InsanityShade wrote:
I'm not sure how it happened, as I have AVG and Ad-Aware installed, both of which say my system is clean, and I never open any of the scam emails.
AVG isn't worth the time spent downloading it, not since sometime late last year. It's so easily spoofed that even if it says all is well, I wouldn't believe it. Use Avast or Avira for your antivirus, install Malwarebyte's Antimalware and run both frequently. If you don't use Firefox, install that and use No-Script and, just because it's handy, AdBlock Plus... but not on here, heh.
Install the very latest version of Flash Player which has some security flaws fixed up, and then delete Adobe Reader altogether and use a program called Sumatra to view any PDF documents instead. Get a good firewall program (mine is built in to the paid version of Avira) and set it to 'interactive', because it will send you alerts when something tries to send outbound traffic.
Finally, DO NOT USE SYSTEM RESTORE. Turn it off and don't turn it back on. The files in a System Restore point are "inactive" and are thus protected from access and manipulation by things like antivirus software. I've encountered several trojans that hide in there, so even if your antivirus software clears the infection elsewhere on the hard drive, it simply re-installs itself from the safety of the Restore Points. If your antivirus software is up to it, it might FIND the malicious code, but it will report that it cannot delete it - so don't use System Restore. I haven't used it in years.
Even all this won't necessarily protect you forever, because "poisoned websites" are becoming more widespread. These are legitimate websites that have malicious code inserted into them by hackers. The code injected on the websites scans the machine of any visiting Windows user to see if any one of a number of separate vulnerabilities are present. Examples of these vulnerabilities can be found in web browsers, instant messaging programs, document readers and media players, and in the last few months some Warcraft-related video clips have been uploaded that deliberately contain this malicious code. (Raolan referred to this in his post yesterday, in which he advised people to upgrade to the latest Adobe Flash Player)
The malicious code then installs a small trojan through any vulnerability it can find, then lies dormant until a user types in data that it is interested in, which could be anything from login details for online banks to games such as World of Warcraft. Unfortunately, these trojans are proving quite tricky to eradicate even if they're actually detected in the first place, and it doesn't help that the affected websites often stay infected for weeks, if not months. Virus-writers are constantly trying to stay ahead of the antivirus software companies, so even the best antivirus software could potentially be overcome by the latest virus.
In short, the days when you were safe simply by not opening email attachments or by not visiting "dodgy" websites are LONG gone. There is no "safe" computer any more, and it's largely a case of prevention and then, when (not "if") that fails, it's often a case of damage limitation before wiping the hard drives and reinstalling from scratch.
Edited, Jun 7th 2010 6:24pm by Krago