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Does a Trojan need to be executed in order to plant itself onto the system?


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#1 starfairy

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Posted 11 June 2013 - 07:48 AM

Hi everyone :)

 

This might be a really ignorant question but I'm really worried!

 

I downloaded this file today (in RAR format) thinking that it was something else, and after I extracted the parts into a directory, Avira notified me that the .exe file contained a Trojan, and that it wasn't deleted.

 

From Avira's log:

 

 [DETECTION] Is the TR/Horse.KLN Trojan
  [WARNING]   An error has occurred and the file was not deleted. ErrorID: 26004
  [WARNING]   The source file could not be found.
 
I didn't run the .exe, so I'm wondering if it's possible that my PC can still be infected? I've scanned with MalwareBytes, ESET, etc and they haven't found anything.
 
Thank you all :)


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#2 quietman7

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Posted 11 June 2013 - 02:52 PM

A Trojan Horse is a destructive stand-alone application that masquerades as a benign program and hides "malicious code" within the original source code in such a way that it can gain control and do its chosen form of damage. This malicious code is a process or function specifically added by the Trojan's programmer that performs an activity the user is unaware of. Trojans are executable programs (.exe, .vbs, .com, .bat, etc) which means that when you open the file, they will perform some action.

The detection(s) could possibly be false positives so you should get second opinion. Go to one of the following online services that analyzes suspicious files:--In the "File to Scan" (Upload or Submit) box, browse to the location of the suspicious file(s) and submit (upload) it for scanning/analysis. If you get a message saying "File has already been analyzed", click Reanalyze or Scan again.
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