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False positives or a genuine threat?


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5 replies to this topic

#1 Fishbed

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Posted 25 March 2010 - 02:27 PM

Whilst browsing the Internet, I got an alert from Bitdefender that an obscure file on my PC had been declared malicious and was asking me to confirm whether to block it or not. No sooner had that happened than another message appeared concerning another file, and then another and another, and I kept blocking them until I realised that these were flagging trusted programs I have had installed for years. I ran a deep scan straightaway and located a single trojan which was apparently deleted without any fuss (I don't know when precisely I may have picked this up). However I am still getting alerts whenever I try to open an .exe file, saying that Bitdefender considers it a malicious program and advises blocking it. Beyond the alerts, though, there doesn't seem to be any problem - nothing has appeared on scans, even when scanning an individual file that Bitdefender has specifically warned against, and I don't appear to be suffering from any traditional symptoms of viruses (slowdowns, pop-ups, re-directions etc).
Is it possible that Bitdefender itself is at fault here, and is trying to block perfectly clean files (could this be related to the recent mess over their update?), or is it possible than my PC is genuinely infected? I would appreciate any help or advice on this matter; I find it hard to believe that Bitdefender would warn against opening dangerous files and then show no sign of recognition when they are scanned with the same program...

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#2 hoverdave

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Posted 25 March 2010 - 03:36 PM

Honestly, I would ask one of the responders to take a look at your logs. While the files themselves might not be infected, it's quite possible you have an active infection that is being detected when those trusted programs are run, thus setting off a false positive on the file, when the infection is already in memory. Perhaps a bad winlogon notifier dll entry or similar. Just an example, of course - I would pursue more active detection, though.

Remove unnecessary quote. ~ OB

Edited by Orange Blossom, 30 March 2010 - 09:05 PM.


#3 Fishbed

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Posted 29 March 2010 - 04:42 PM

Something to add - My Documents has been automatically opening whenever I turn on my PC, which has never happened before.

#4 boopme

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Posted 30 March 2010 - 10:40 PM

Hello and welcome.

We need a deeper look,please go here....
Preparation Guide ,do steps 6 - 9.

Create a DDS log and post it in the new topic from step 9.
If Gmer won't run,skip it and move on.
Let me know if that went well.
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#5 Fishbed

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Posted 02 April 2010 - 11:46 PM

Thank you for your advice, boopme. While GMER would open, it slowed my PC to a point where it was completely unusable and had to be reset, so I've skipped it accordingly.
Since posting this, though, my internet connection has become erratic (sometimes repeatedly disconnecting) and Bitdefender has reported that it's blocked (but can't delete or quarantine) Gen:Packed.Hiloti.1, which I doubt is unrelated to my initial problem. I'm not sure how serious this is going to turn out to be...

Edited by Fishbed, 02 April 2010 - 11:51 PM.


#6 Orange Blossom

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Posted 03 April 2010 - 01:32 AM

Hello,

Now that you have posted a log here: http://www.bleepingcomputer.com/forums/t/306839/unknown-problem-possibly-genpackedhiloti1/ you should NOT make further changes to your computer (install/uninstall programs, use special fix tools, delete files, edit the registry, etc) unless advised by a MRT Team member, nor should you ask for help elsewhere. Doing so can result in system changes which may not show in the log you already posted. Further, any modifications you make on your own may cause confusion for the helper assisting you and could complicate the malware removal process which would extend the time it takes to clean your computer.

From this point on the MRT Team should be the only members that you take advice from, until they have verified your log as clean.

Please be patient. It may take a while to get a response because the MRT Team members are EXTREMELY busy working logs posted before yours. They are volunteers who will help you out as soon as possible. Once you have made your post and are waiting, please DO NOT make another reply until it has been responded to by a member of the MRT Team. Generally the staff checks the forum for postings that have 0 replies as this makes it easier for them to identify those who have not been helped. If you post another response there will be 1 reply. A team member, looking for a new log to work may assume another MRT Team member is already assisting you and not open the thread to respond.

Please be patient. It may take several days to get a response but your log will be reviewed and answered as soon as possible. I advise checking your topic once a day for responses as the e-mail notification system is unreliable.

To avoid confusion, I am closing this topic. Good luck with your log.

Orange Blossom :thumbsup:
Help us help you. If HelpBot replies, you MUST follow step 1 in its reply so we know you need help.

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