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17 June 2013

FreeFixer programming on Justin.tv

by Roger Karlsson

Wanted to let you know that I've set up a livestream over at Justin.tv where you can see me do some C++ programming on the FreeFixer tool.

Hopefully this will make it easier for all you to ask a quick question about FreeFixer or the freefixer.com web site. I might be available in the chat even if I'm not streaming. Click the Viewer List icon to the right of the chat to see if I'm there. The best chance to catch me live is between 10.00 and 17.00.

If I'm there, say hi to me ;)

Music by Telegraphy. Please tell me if you know about some nice music free for broadcast.

07 September 2012

The state of Internet Explorer after installing the top 20 downloads from Download.com

by Roger Karlsson

Does this sound familiar? You get a call from your parents. There's some problem with their computer. The printer isn't working, the computer won't connect to the wireless network or something like that. You go there and fix the problem, but while troubleshooting you also notice that there are some new toolbars in their web browser. When you ask them about the toolbars they usually say they have no idea how the toolbars got there.

These toolbars are typically bundled with other software and if you don't pay attention during the installation process, you might end up installing not only the program that you actually want, but also some toolbars or other software that you did not want at all. Why? The majority of the bundled software is opt-out - you have to explicitly say NO to the bundled software by unchecking some checkbox during the installation.

So, today I decided to start with a fresh installation of Windows Vista, then download the top 20 most popular downloads from Download.com, install them without opting out of the bundled software. This is how your Internet Explorer will look like:

Updated 2012-09-08: Fixed publication date. The post was published 2012, not 2010.

08 June 2010

Please give me some feedback on FreeFixer

by Roger Karlsson

What do you think about the FreeFixer application and the freefixer.com web site? I've set up this blog post so you easily can post your feedback. Want to see a new feature? Did you spot a spelling error? Did FreeFixer fail to remove some malware file? Want to see more screenshots?

Please post your feedback below. Anything is welcome. If you see someone already has posted your suggestion, please give them a "thump up".

23 October 2009

Malware Detection - The Simplest Thing That Could Possibly Work

by Roger Karlsson

I'm sure most of you already know how the FreeFixer application works: It scans many locations on your Windows machine, such as the browser plugins, processes and services that are installed on your system. In its current state, FreeFixer does not have much knowledge whether a file is good or bad: It greenlists files from trusted software vendors and hides critical system files completely from the scan result. The remaining files appears in the scan result, neither listed as good, nor as bad. It's the responsibility of the user to figure out, with the help of the other FreeFixer users and the FreeFixer file library, if a file should be considered safe or if it should be removed.

This is how FreeFixer is designed to work, but admittedly, it's not easy for an inexperienced user to figure out which of the files in the scan result, if any, that should be selected for removal.

Many FreeFixer users have contacted me and suggested that FreeFixer should also detect and display malware files in red like most of the other anti-spyware and anti-virus tools do. And the suggestion makes perfect sense: It would be great to combine malware detection with the manual inspection and removal features. It would attract both beginners and experienced users.

However, I've always said no to this feature request, since it already requires lots of work to add new scan locations, supporting even more platforms than those supported today and working on the FreeFixer.com web site. Adding an additional task of analyzing lots of malware and creating malware definitions would probably result in crappy FreeFixer program with a crappy malware detection list.

Do you want to create malware definitions for FreeFixer?

I'm currently experimenting with a new set of features that allows anyone to create malware definitions for FreeFixer. I've started out with the simplest thing that could possibly work: Detection based on file locations. You simply define which files are malware by specifying the file locations in an .xml file. For example, the existence of ld14.exe in the Windows directory indicates that your machine is infected with the Koobface worm.

I'll link to your definition file from FreeFixer.com. FreeFixer users downloads your .xml file. Now the malware files get flagged in their scan results. The detection name that you gave the file appears and if users click on it they will be linked to your web site where you can explain more about the threat. You get credit for your work.

I've created a tiny example how to build the malware-definitions. I think you'll understand the concept by looking directly into the .xml file:

http://www.freefixer.com/static/freefixer-demo-defs.xml

Put this file in c:\Program Files\FreeFixer\definitions\ and FreeFixer will detect some variants of the Koobface worm. The Koobface files will appear in red in the scan result.

If there's interest in building malware definitions for FreeFixer I'll keep on adding detection features. Some of the features that would be nice is SHA256 and MD5 detection, detection based on various parts of a file, detection of registry keys, values and data, memory scanning, signed xml-files, automatic updates, etc. You name it.

Anyone interested?

26 June 2009

Summer of Drive-By Downloads

by Roger Karlsson

The summer has finally arrived here in Sweden. Now is the time to go swimming, bouldering and do all the other things that requires great weather.

As you may know, I've been documenting lots of drive-by downloads and intend to continue doing so during the summer. To make this as smooth as possible I've set up this blog post which I'll update when I find some new malware that use security holes to install.

--

As usual, I'm scanning the infected system with FreeFixer to find out what's been installed on the system. I'm also using FreeFixer to remove the unwanted files.

10 July

Today the rogue System Security application installed. Nothing new under the sun except this driver that can along:

c:\windows\system32\drivers\amd64si.sys

8 July

c:\windows\system32\drivers\netsik.sys
c:\windows\system32\msrr32.dll
c:\win32upd.exe

6 July

c:\windows\system32\appwinproc.dll
HOSTS file redirecting antispy.microsoft.com to 209.44.111.62
HOSTS file redirecting antiaware-pro.com 209.44.111.62
HOSTS file redirecting www.antiaware-pro.com to 209.44.111.62

4 July

c:\windows\system32\msxz.exe

2 July

Another nasty infection. The files msjv32.dll and msne.exe was hidden from detection by a rootkit:

c:\windows\system32\msjv32.dll
C:\Documents and Settings\Roger\Skrivbord\msdos.pif
c:\windows\system32\msne.exe

1 July

C:\WINDOWS\9129837.exe
c:\windows\system32\drivers\securentm.sys
C:\WINDOWS\System32\rr64_b.exe
HOSTS file redirecting safesystem.microsoft.com to 209.44.111.62
HOSTS file redirecting antiviraprof.com to 209.44.111.62
HOSTS file redirecting www.antiviraprof.com to 209.44.111.62

30 June

Nasty little bugger. None of the 40 anti-virus engines over at VirusTotal.com detects HB32.dll:

C:\WINDOWS\system32\wbem\HB32.dll

29 June

C:\WINDOWS\system32\EVA.exe
C:\DOCUME~1\Roger\LOKALA~1\Temp\init.exe
C:\DOCUME~1\Roger\LOKALA~1\Temp\3.EXE
c:\windows\system32\drivers\systemntmi.sys
C:\Documents and Settings\Roger\Application Data\twex.exe
C:\Documents and Settings\Roger\Start-meny\Program\Autostart\rncsys32.exe
C:\WINDOWS\ld09.exe
C:\WINDOWS\System32\net.net

26 June

This drive-by download installed the System Security Rogue, Koobface, and a malware device driver:

C:\windows\ld11.exe
C:\Documents and Settings\All Users\Application Data\15452184\15452184.exe
c:\program\sys\sys.sys

26 June

A device driver + additional malware:

C:\WINDOWS\System32\drivers\ethxhkrw.sys
C:\WINDOWS\System32\sdra64.exe
C:\WINDOWS\system32\logon.exe

24 June 2009

Malware Doctor - Another rogue security application installing through security holes

by Roger Karlsson

About three weeks ago Avelino Rico Jr over at McAfee Labs blog reported about a new rogue security program called Malware Doctor.

This morning my honeypot caught Malware Doctor and some additional malware installing by exploiting a security. I've pasted the FreeFixer log and marked the malware item in red:

FreeFixer v0.41 log
http://www.freefixer.com/
Operating system: Windows XP Service Pack 1
Log dated 2009-06-23 23:14


System policies
HKCU\..\policies\system, DisableTaskMgr = 1
HKCU\..\policies\system, DisableRegistryTools = 1

Browser Helper Objects
{AFF01325-0FC2-4749-8914-FBF0565AD9CC}, Chrome copyright, jbnmck.dll(file is missing)

Registry Startups
HKLM\..\Run, Malware Doctor = C:\Documents and Settings\LocalService\Application Data\1361538659.exe
HKCU\..\Run, MSMSGS = "C:\Program\Messenger\msmsgs.exe" /background
HKCU\..\Run, Malware Doctor = C:\Documents and Settings\LocalService\Application Data\1361538659.exe

Processes (17 whitelisted)
C:\Program\Messenger\msmsgs.exe
C:\WINDOWS\System32\NOTEPAD.EXE
C:\Program\FreeFixer\freefixer.exe
C:\WINDOWS\System32\avast!Antivirus.exe
C:\Documents and Settings\LocalService\Application Data\1361538659.exe

Services (34 whitelisted)
avast!Antivirus, , c:\windows\system32\avast!antivirus.exe

Recently modified files (1 whitelisted)
16 minutes, c:\Documents and Settings\LocalService\Application Data\1361538659.exe
16 minutes, c:\WINDOWS\system32\jbnmck.dll
16 minutes, c:\WINDOWS\system32\avast!Antivirus.exe
16 minutes, c:\WINDOWS\Temp\wpv521245837260.exe
7 days, c:\Program\FreeFixer\freefixer.exe
36 days, c:\Program\FreeFixer\Uninstall.exe