The error message "Not a valid Win32 application
" can be symptomatic of a serious malware infection which disables anti-virus and security tools. It adds a hidden service and a dangerous rootkit which can be difficult to remove as well as compromises the affected machine to other malware attacks. In your case there is additional evidence of a DNSChanger with rootkit components
. The current removal tools you have tried are ineffective.Rootkits
and backdoor Trojans
are very dangerous
because they use advanced techniques (backdoors) as a means of accessing a computer system that bypasses security mechanisms and steal sensitive information which they send back to the hacker. Many rootkits can hook into the Windows 32-bit kernel, and patch several APIs to hide new registry keys and files they install. Remote attackers use backdoor Trojans
and rootkits as part of an exploit to gain unauthorized access to a computer and take control of it without your knowledge.
If your computer was used for online banking, has credit card information or other sensitive data on it, all passwords should be changed immediately
to include those used for banking, email, eBay, paypal and online forums. You should consider them to be compromised
. They should be changed by using a different computer and not the infected one. If not, an attacker may get the new passwords and transaction information. If using a router
, you need to reset it with a strong logon/password so the malware cannot gain control again. and credit card institutions should be notified of the possible security breach. Because your computer was compromised please read How Do I Handle Possible Identify Theft, Internet Fraud and CC Fraud?
Although the rootkit was identified and removed, your PC has likely been compromised and there is no way to be sure the computer can ever be trusted again. It is dangerous and incorrect to assume that because this malware has been removed the computer is now secure
. In some instances an infection may have caused so much damage to your system that it cannot be completely cleaned or repaired. The malware may leave so many remnants behind that security tools cannot find them. Many experts in the security community believe that once infected with this type of malware, the best course of action is to wipe the drive clean, reformat and reinstall the OS. Please read:
• "When should I re-format? How should I reinstall?
• "Help: I Got Hacked. Now What Do I Do?
• "Where to draw the line? When to recommend a format and reinstall?
Should you decide not to follow that advice, disinfection will require the use of more powerful tools than we recommend in this forum
. Before that can be done you will need you to create and post a DDS/HijackThis log for further investigation.
Please read the pinned topic titled "Preparation Guide For Use Before Posting A Hijackthis Log
". If you cannot complete a step, then skip it and continue with the next. In Step 6
there are instructions for downloading and running DDS
which will create a Psuedo HJT Report
as part of its log.
When you have done that, post your log
in the HijackThis Logs and Malware Removal
forum, NOT here
, for assistance by the HJT Team Experts. A member of the Team will walk you through, step by step, on how to clean your computer. If you post your log back in this thread, the response from the HJT Team will be delayed because your post will have to be moved. This means it will fall in line behind any others posted that same day.
Start a new topic, give it a relevant title and post your log along with a brief description of your problem, a summary of any anti-malware tools you have used and a summary of any steps that you have performed on your own. An expert will analyze your log and reply with instructions advising you what to fix. After doing this, we would appreciate if you post a link to your log back here so we know that your getting help from the HJT Team.Please be patient. It may take a while to get a response because the HJT Team members are very 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 "bump" your post or make another reply until it has been responded to by a member of the HJT 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 HJT Team member is already assisting you and not open the thread to respond.
If after 5 days
you still have received no response, then post a link to your log in the thread titled "Post in this thread when you haven't received an answer in five days.