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Suspected malware on High Disk Usage - Combofix log analysis


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#1 borysk

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Posted 12 November 2015 - 05:51 AM

Hello,

I try to keep my home PC ACER laptop model VA70 clean on Win8 64 bit, with Kaspersky AV. CPU is i3-2328M @ 2.80 Ghz and RAM is 4Gb, HD 500 Gb

Altough I understand HW architecture, working of BIOS, drivers, services, DLL and exe, as I work my self in engineering software on linux, and have admin knowledge, I only have limited practice with registries, layers of Windows OS and the like, and joined this forum for the issue mentionned.

As it has slowed down, sometimes taking several minutes for response to starting a software or changing user, In the performance viewer, It is always the disk usage that is large, CPU, RAM and network are low, although beside antivirus when it runs, at other time it use is svchost.exe (netsvcs) c:\pagefile.sys.

This is understood when many processes runs, and RAM is used, which is not the case. I could not point the culprit.

 

When it happens, Disk always at 100% highest active time. Maximal disk use, avg access time up to 5s

understand checked these:

- full scan by Kaspersky show no infected files

- reviewed activated services and program started.

- disk cleanup and disk fragmentation

- Disabled: SuperFetch, IIS, and media server

 

Installed SW are mainly Office, Canon photo software, Nuance Paperport (scan, OCR)  and a few other open source or freeware (calibre, shareazza).

Even if there is no direct indication of malware, I decided to be safe on this side.

 

I did run RogueKiller and it only found 3 PUP items, not significant in my opinion. No item in the other tabs. 

The AV configuration is conservative with daily quick scan and periodic full scan.

 

Following information on this site, I run Combofix, which log is attached. About some items listed, are related to installed software that are legitimate:

Garmin, Atheros (drivers to Bluetooth...) . other software I did uninstall are : Orange, Start8, Skype (months ago, I also got rid of a nasty pst converter to outlook express that  was nagging me)

 

I hope the information is accurate and relevant. I would be grateful for checking this log and any directions as needed. In the mean time I complete the action plan that I set myself, with Malwarebytes Anti-Rootkit. Thank you.

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#2 nasdaq

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Posted 16 November 2015 - 09:53 AM

Hello, Welcome to BleepingComputer.
I'm nasdaq and will be helping you.

If you can please print this topic it will make it easier for you to follow the instructions and complete all of the necessary steps in the order listed.
===

I need more information.

Download the version of this tool for your operating system.
Farbar Recovery Scan Tool (64 bit)
Farbar Recovery Scan Tool (32 bit)
and save it to a folder on your computer's Desktop.
Double-click to run it. When the tool opens click Yes to disclaimer.
Press Scan button.
It will make a log (FRST.txt) in the same directory the tool is run. Please copy and paste it to your reply.
The first time the tool is run, it makes also another log (Addition.txt). Please attach it to your reply.

How to attach a file to your reply:
In the Reply section in the bottom of the topic Click the "more reply Options" button.
attachlogs.png

Attach the file.
Select the "Choose a File" navigate to the location of the File.
Click the file you wish to Attach.

Click the Add reply button.
===

Wait for further instructions.

#3 nasdaq

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Posted 22 November 2015 - 08:09 AM

Due to the lack of feedback, this topic is now closed.

In the event you still have problems, please send me or any Moderator a Private Message and ask them to reopen this topic within the next 5 days.

Please include a link to your topic in the Private Message. Thank you.




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