Trojans and TCP view

Trojans and TCP view

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Trojans and TCP view =?Utf-8?B?ZG9z?= 01-24-2008
Posted by =?Utf-8?B?ZG9z?= on January 24, 2008, 2:33 pm
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Hi,
my question is how to know that a trojan is comunicating with it's owner?
I'm using TCP view. Wich files are present on infected pc and are they
visible trough tcp view?
Can a trojan use legitimate files like firefox.exe and sends data trough
different ports? Please give me an example of tipical trojan connection?

Thanks.

Posted by Volodymyr Shcherbyna on January 24, 2008, 5:27 pm
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Traffic depends on troyans. Usually malware masks as a http client, and uses
built in OS capabilities (WinInet, WinHTTP) to communicate with web servers.
Each case requires investigation. So you'd better take some time, and
investigate the overall traffic on machine.

--
V.
This posting is provided "AS IS" with no warranties, and confers no
rights.
> Hi,
> my question is how to know that a trojan is comunicating with it's owner?
> I'm using TCP view. Wich files are present on infected pc and are they
> visible trough tcp view?
> Can a trojan use legitimate files like firefox.exe and sends data trough
> different ports? Please give me an example of tipical trojan connection?
>
> Thanks.



Posted by David H. Lipman on January 24, 2008, 5:54 pm
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| Hi,
| my question is how to know that a trojan is comunicating with it's owner?
| I'm using TCP view. Wich files are present on infected pc and are they
| visible trough tcp view?
| Can a trojan use legitimate files like firefox.exe and sends data trough
| different ports? Please give me an example of tipical trojan connection?
|
| Thanks.

TCPView helps but not completely.

Individual files by themsleves may show communication "home" or to peers.
However, some
malware can hook directly into the OS such that a particular EXE file will not
be indicated,
it will appear the OS is communicating to the malicious third part web sites.


Trojans can use legit files by patching the legit files with malicious code.
Additionally,
malware often uses the EXE name of legit files such as firefox.exe however what
is important
is the Fully Qualified Name (FQN) and path to the EXE file.

For example:
c:\windows\system32\svchost.exe is legit
C:\Program Files\Common Files\System\svchost.exe is NOT legit !


--
Dave
http://www.claymania.com/removal-trojan-adware.html
Multi-AV - http://www.pctipp.ch/downloads/dl/35905.asp



Posted by Volodymyr Shcherbyna on January 25, 2008, 5:10 am
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In addition, TCPView does not show connections made in the context of
'System' process. It means, that a malware driver is able to create a pool
thread item, and execute it in the context of System using TDI interface for
communication. This, for sure, will not be depicted in TCPView.

As more advanced tool, I suggest to use WireShark.

--
V
This posting is provided "AS IS" with no warranties, and confers no
rights.
>
> | Hi,
> | my question is how to know that a trojan is comunicating with it's
> owner?
> | I'm using TCP view. Wich files are present on infected pc and are they
> | visible trough tcp view?
> | Can a trojan use legitimate files like firefox.exe and sends data trough
> | different ports? Please give me an example of tipical trojan connection?
> |
> | Thanks.
>
> TCPView helps but not completely.
>
> Individual files by themsleves may show communication "home" or to peers.
> However, some
> malware can hook directly into the OS such that a particular EXE file will
> not be indicated,
> it will appear the OS is communicating to the malicious third part web
> sites.
>
>
> Trojans can use legit files by patching the legit files with malicious
> code. Additionally,
> malware often uses the EXE name of legit files such as firefox.exe however
> what is important
> is the Fully Qualified Name (FQN) and path to the EXE file.
>
> For example:
> c:\windows\system32\svchost.exe is legit
> C:\Program Files\Common Files\System\svchost.exe is NOT legit !
>
>
> --
> Dave
> http://www.claymania.com/removal-trojan-adware.html
> Multi-AV - http://www.pctipp.ch/downloads/dl/35905.asp
>
>



Posted by =?Utf-8?B?Um9uIEg=?= on January 25, 2008, 9:58 am
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Hi David, After reading your answer to this post i went to Task Manger
and found five (5) svchost.exe services running - 3 Network Services ,
and 2 System. Now after seeing your answer and checking
Process Library and finding out this svchost.exe could be used by a
Trojan, How can i find out the path's of these services in Task Manger
like in your example? Thanks Ron (Defender)

"David H. Lipman" wrote:

>
> | Hi,
> | my question is how to know that a trojan is comunicating with it's owner?
> | I'm using TCP view. Wich files are present on infected pc and are they
> | visible trough tcp view?
> | Can a trojan use legitimate files like firefox.exe and sends data trough
> | different ports? Please give me an example of tipical trojan connection?
> |
> | Thanks.
>
> TCPView helps but not completely.
>
> Individual files by themsleves may show communication "home" or to peers.
However, some
> malware can hook directly into the OS such that a particular EXE file will not
be indicated,
> it will appear the OS is communicating to the malicious third part web sites.
>
>
> Trojans can use legit files by patching the legit files with malicious code.
Additionally,
> malware often uses the EXE name of legit files such as firefox.exe however
what is important
> is the Fully Qualified Name (FQN) and path to the EXE file.
>
> For example:
> c:\windows\system32\svchost.exe is legit
> C:\Program Files\Common Files\System\svchost.exe is NOT legit !
>
>
> --
> Dave
> http://www.claymania.com/removal-trojan-adware.html
> Multi-AV - http://www.pctipp.ch/downloads/dl/35905.asp
>
>
>

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