Typical Question – How did I get infected with trojan and virus…
(I am antibotnet Yahoo ID as webmaster www.bluecollarpc.us)
may help a little with orientation with the behavior of malware. A trojan takes control and wants to do something and will rifle actions to get it done. A crash may occur because it is not normal expected behavior of the healthy system as is giving control command in an underhanded way as brute force. Trojans have evolved greatly and they have security software disabling trojans which disable free products and some shareware products as well. There are now Downloader Trojans that install more and more malware as the rootkit usually does. There are backdoor trojans that affect connectivity and control vital areas.
The crash you mention probably did occur from the trojan infection and spyware does this too as opposed to a computer virus or worm. AVG did indicate a trojan infection found.
Viruses take over files to spread themselves. Some are specifically created to destroy computer files, systems, or drive itself. Newer ones have been crafted to steal passwords.
Your problem seems to be you are using the free AVG version which will NOT protect the computer because Real Time Protection is only activated in paid subscription antivirus and antispware products. If you had AVG paid antivirus – it would have blocked the trojan infection from occurring. NOTE today there are many newer and sophisticated trojans that simple antivirus no longer detects all. Antispyware will detect many of these and particularly ones used in spyware installations.
These can happen anywhere on the world wide web at any infected website whether hacked or intentionally a malicious content website. This is called a “drive by infection” meaning the unprotected computer will get infected just by visiting a bad website. This can include and is not limited to virus, trojan, spyware, and botnet infections. You MUST have Real Time Protection activated or there is NO protection.
The free home version scanners are called stand alone on demand scanning as “reactive” protection. Paid subscription security softwares have all this plus the “proactive” Real Time Protection processes (heuristics) that block all infections from occurring in the first place. All that gets past this is generally embedded malware in some software download that can be found by scanning the package FIRST before clicking to install OR will detect it trying to execute when the installer package is double clicked to execute the installation.
Threatfire is great as just the Real Time Protection processes protection themselves for both ativirus and antispwyare catagory threats. You can add that and scan regularly with AVG free. http://www.threatfire.com/
You forgot antispware with Real Time Protection – get free from Microsoft, Windows Defender to add to this package….. http://www.microsoft.com/athome/security/spyware/software/default.mspx
There are only two or three known antivirus and antispwyare programs in the world that have offered free Real Time Protection products, and fortunately they are far from dog programs. They have won several prestigious awards that the big companies have such as the VB100 Award and West Coast Certification to name a couple. I would pick one and install it immediately and keep AVG off to the side as a secondary stand alone scanner.
Microsoft Security Essentials
Comodo Free Anti Virus
(Antispyware and antivirus. Real time protection added ! )
* Fast spyware scanning
* 100% real-time protection
* HIPS protection
* Antivirus protection
* Multilanguage Support