Some virus questions

Some virus questions
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Some virus questions cranium.2003 05-02-2005
Posted by on May 2, 2005, 6:57 am
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hello,
I have some questions about viruses.
1) The person who sent virus on Internet What is
called?(Hacker,Attacker or anything else)
2) How virus comes to me through my say Yahoo mail Account?
Its ok that unknown mail can contain virus as attachment but can it be
possible that a mail from legitimate person when i save on harddisk
also download virus?
3) How virus comes in program that i am downlaoding from any FTP
server?
4) Does viruses are sent from end point or hacker get access of Router
can send from Router?
5) I am curious to above questions because if big Program is started to
downlad then if path through which its coming have all 1500 MTU then
how can packets be modified to sent virus by unknown person?
Its not possible. Isn't it?



Posted by Moe Trin on May 2, 2005, 2:56 pm
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cranium.2003@gmail.com wrote:

>I have some questions about viruses.

Try 'comp.virus' (a moderated newsgroup) or alt.comp.virus

>1) The person who sent virus on Internet What is
>called?(Hacker,Attacker or anything else)

Not that many people target you specifically. The crap you are getting is
the result of worms and zombies running on computers operated by people who
shouldn't be allowed within 10 kilometers of anything with an electron in it.
"hacker" is a popular corruption of the term 'cracker'. "attacker" is
probably to kind - "script kiddies" are a closer description.

>2) How virus comes to me through my say Yahoo mail Account?

The person owning the computer that sent it has allowed his computer to
be taken over.

>Its ok that unknown mail can contain virus as attachment but can it be
>possible that a mail from legitimate person when i save on harddisk
>also download virus?

See above. There is a good reason not to accept html based mail, especially
if your computer is configured to "help you" by doing things automatically.

>3) How virus comes in program that i am downlaoding from any FTP server?

Not all FTP sites are squeaky clean. Download from trusted sites only.

>4) Does viruses are sent from end point or hacker get access of Router
>can send from Router?

Not clear why you would be accepting anything from a router. A router is
meant to pass packets from "A" to "B" Those not charged with the running
the router should not be trying to get packets that _originate_ on the
router. If you are asking about someone hijacking the connection, that's
generally done with DNS poisoning, as any compatently run router would not
be accepting connections from anyone but it's owner, and thus should not
be hijacked.

>5) I am curious to above questions because if big Program is started to
>downlad then if path through which its coming have all 1500 MTU then
>how can packets be modified to sent virus by unknown person?

I think you are asking how an attacker can insert packets into an existing
datastream. The answer would be that it's not very likely. The resulting
packet size wouldn't match the headers, and the data would fail checksums.
Also, sequence numbers would not match up, causing a data reassembly failure.

Old guy



Posted by Michael Pelletier on May 2, 2005, 9:34 pm
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cranium.2003@gmail.com wrote:

>
> hello,
> I have some questions about viruses.
> 1) The person who sent virus on Internet What is
> called?(Hacker,Attacker or anything else)

A moron for getting infected...Honestly, most (not all) viruses sent are
sent because the person's computer got infected. Most of the time they do
not even know it.

> 2) How virus comes to me through my say Yahoo mail Account?

Are you asking why you get viruses in your Yahoo account or why viruses can
come from Yahoo accounts?

> Its ok that unknown mail can contain virus as attachment but can it be
> possible that a mail from legitimate person when i save on harddisk
> also download virus?

Sure. It is the same problem...


> 3) How virus comes in program that i am downlaoding from any FTP
> server?

I think you are asking how a virus can be uploaded when using FTP? If that
statement is correct you are uploading a trojan (something that pretends to
be something legitimate when in fact it is not). Remember, when download
something, you should always know who you are getting it from.

> 4) Does viruses are sent from end point or hacker get access of Router
> can send from Router?

If someone got access to you router they could infact email viruses sure.
Have you ever send email with telnet before? Honestly, if someone got hold
of your router they can do a lot more damage then just emailing viruses!

> 5) I am curious to above questions because if big Program is started to
> downlad then if path through which its coming have all 1500 MTU then
> how can packets be modified to sent virus by unknown person?

ah...I am not sure what you are asking. MTU means nothing more than Maxium
Transmition Unit. It is just the maximum size a data segment can be sent
"on the wire". This, alone, does not provide you with security....

Please try to construct that sentence better. I do not understand what you
are asking.

> Its not possible. Isn't it?

Anything is possible with computers. That is the fun part.

Michael
--
"Trusted Computing" is a SCAM
http://www.gnu.org/philosophy/can-you-trust.html

Protect your rights
http://www.eff.org/
http://www.publicknowledge.org/


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