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Topic: Is firewall safe against trojan? (Read 4190 times) previous topic - next topic
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Is firewall safe against trojan?

I don't really understand how trojan works, what I know is it can destroy or steal your data and open port to allow someone to connect to your computer and doing sth.

My question is, if I closed all the port using firewall. Is it possible for someone to connect to my computer and still my data or get the keylog? Assume that there is a trojan in my computer.

Is firewall safe against trojan?

Reply #1 –
afaik firewall can disable what trojan is doing, but of course you will need some other tools to destroy the bugger. (very well known 'trojan' called divx-pro is disabled that way for example)
PANIC: CPU 1: Cache Error (unrecoverable - dcache data) Eframe = 0x90000000208cf3b8
NOTICE - cpu 0 didn't dump TLB, may be hung

Is firewall safe against trojan?

Reply #2 –
So once I close all my port, there is no possibilities that someone can get any information from my computer by using trojan?

Is firewall safe against trojan?

Reply #3 –
There are many types of trojans. Using a standard firewall which blocks incoming connections blocks 'listener trojans' which opens a port on your pc and accepts incoming connections. Well known trojans of this class are subseven and backorifice.

To block 'spyware' type trojans, you need application-level firewalls which must run on the same system as the applications. These firewalls allow only allow internet connections to be made from applications which you specifically allow to access the internet.

Problem with using a firewall on the same system as the applications you run is that lately trojans have started to disable firewalls themselves. Also, they don't stop the trojans from being run. If you come across a malicious trojan which just destroys data, then firewalls won't help.

The best defense against trojans is to use a bit of your brains and prudence and run only trusted applications from trustworthy sources.

Is firewall safe against trojan?

Reply #4 –
Wow... Thanx tangent!

Btw, I have another question. If I reinstall the whole OS (Windows XP), clean install off course. Then I always connect to the internet using limited user and close all the ports using built-in firewall in XP. Is there any possibility to get trojan or virus?

Is firewall safe against trojan?

Reply #5 –
I know backdoor that closes most popural firewalls and AVs and corrupts install files

Is firewall safe against trojan?

Reply #6 –
Quote
Btw, I have another question. If I reinstall the whole OS (Windows XP), clean install off course. Then I always connect to the internet using limited user and close all the ports using built-in firewall in XP. Is there any possibility to get trojan or virus?

If you're not up to date with patches, there is a small chance that a bug with your OS or softwares you run may be exploitable. There is also the even smaller chance that a bug which has not being patched may be exploited.

Even so, you can get a trojan or virus if it is attached to something you download off the internet and run.

Firewalls don't really do much against trojans or virii, really. These things rely more on users stupidity, ignorance or gullibility to propogate.

Is firewall safe against trojan?

Reply #7 –
I would have to say in general even the most paranoid settings in a firewall (like mine) will very rarely show that a trojan horse was blocked. In the 4 years I've used a firewall and have had it set to specifically block particular ports against trojan's I can only count the blocked trojan's on one hand -- about 3 attempts total in 4 years. Software firewalls that can block locally installed applications are essentially only good for blocking outgoing unauthorized traffic, which is really the only way to know that the firewall is blocking a trojan.

Good healthy computing sense is needed such as having a good anti-virus solution installed that has a resident shield, and of course the anti-virus must be regularly updated, by regularly updated I mean checking for an update at least once per week.

Of course if someone visits porn sites, or warez/crack sites then they get exactly what they deserve, and will more than likely be more subject to getting infested with a trojan, virus, spyware trojan horse, or virus invoked via JavaScript or a cookie.

No matter what security software solution someone installs common sense and a little intuition is the determining factor in avoiding trojan's and viruses.

Is firewall safe against trojan?

Reply #8 –
A good realtime AntiVirus software protects much much better than some firewall.
The AntiVirus software will prevent the trojan from even getting executed and loaded, which renders a firewall obsolete. Unless you are experienced with Firewalls, they also tend to bugger up other programs, so chat programs (e.x. ICQ/MSN), videoplayers (ex. QuickTime/Media Player/RealOne) or your favorite multiplayer games might start whining about missing internet connection.

Install up-2-date AntiVirus software, it provides realtime protection against virus (which includes trojans).

/madi

Is firewall safe against trojan?

Reply #9 –
I use: Kerio personal firewall, Kaspersky Antivirus (ex-AVP) and antispies - Spybot and Ad-Aware. I`m quite safe - no viruses, no attacks.

Is firewall safe against trojan?

Reply #10 –
A trojan could send whatever info it wanted by email, so your firewall would have to block email.
Firewalls work best against external attacks.  By definition,  a trojan is invited in.

Is firewall safe against trojan?

Reply #11 –
my hardware firewall blocks trojans like netbus easyly when the port is closed. no chance for the trojan