Jump to content


 


Register a free account to unlock additional features at BleepingComputer.com
Welcome to BleepingComputer, a free community where people like yourself come together to discuss and learn how to use their computers. Using the site is easy and fun. As a guest, you can browse and view the various discussions in the forums, but can not create a new topic or reply to an existing one unless you are logged in. Other benefits of registering an account are subscribing to topics and forums, creating a blog, and having no ads shown anywhere on the site.


Click here to Register a free account now! or read our Welcome Guide to learn how to use this site.

Photo

SVChost infection not flagged by any tools


  • This topic is locked This topic is locked
2 replies to this topic

#1 timwrich

timwrich

  • Members
  • 5 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:MinneSconsin USA
  • Local time:10:22 PM

Posted 07 March 2014 - 11:30 AM

I recently found that our corporate network bandwidth had skyrocketed overnight to upwards of 100 meg on the WAN connection. I tracked it down to one computer, which had four svchost.exe processes pegging each core, and network was around 3-6% of the gigabit connection nonstop. unplugging this from our network caused the cpu to go to 1% and networking to go to 0% on the computer, and normal range on the network.

 

the svchost file had probably 50 tcp connections to random ip addresses around the world, many in eastern europe and russia being most common.

 

i tried the folllowing tools, none of which flagged the svchost.exe file (which ended up being located in the windows\sysWOW64 folder, not system32 per normal)

 

tdsskiller

rkill

dds

combofix

malwarebytes

 

i also used svchost viewer and process explorer (they didnt show up in svchost viewer)

 

i have saved a copy of the svchost file that caused this headache, and if you guys would like, i can attach it... i dont know if attaching the file would be a good idea so i will wait until further instructions.

 

While running a packet capture, i have concluded (the packets are confusing and possibly encrypted) but i think the goal of this infection was clicking ads for money?

 

My goal with this post is to possibly help in the development of tools to flag this infection.



BC AdBot (Login to Remove)

 


#2 timwrich

timwrich
  • Topic Starter

  • Members
  • 5 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:MinneSconsin USA
  • Local time:10:22 PM

Posted 07 March 2014 - 11:39 AM

http://www.bleepingcomputer.com/forums/t/526796/svchost-infection-not-flagged-by-any-tools/

 

is a thread with logs.



#3 Animal

Animal

    Bleepin' Animinion


  • Site Admin
  • 35,068 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Where You Least Expect Me To Be
  • Local time:08:22 PM

Posted 07 March 2014 - 11:45 AM

Hello,

Now that you have posted a log at the above link, 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.

If HelpBot replies to your topic, PLEASE follow Step One so it will report your topic to the team members.

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

The Internet is so big, so powerful and pointless that for some people it is a complete substitute for life.
Andrew Brown (1938-1994)


A learning experience is one of those things that say, "You know that thing you just did? Don't do that." Douglas Adams (1952-2001)


"Imagination is more important than knowledge. Knowledge is limited. Imagination circles the world." Albert Einstein (1879-1955)


Follow BleepingComputer on: Facebook | Twitter | Google+




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users