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

I still have Win32:Sality virus?


  • Please log in to reply
3 replies to this topic

#1 Tina-

Tina-

  • Members
  • 2 posts
  • OFFLINE
  •  
  • Gender:Female
  • Local time:11:57 PM

Posted 24 August 2011 - 11:28 AM

Hello! I don't know if I am still infected with viruses.

Today I just installed a new AntiVirus because the other one expired over one week ago. Now I have avast! Antivirus 5.0.594. After I installed it I did a Full System Scan and it found 3 files infected with Win32:Vitro and 47 files infected with Win32:Sality and I moved them all to Chest. After that I started a Quick Scan and it didn't find any viruses.
I wish I could post there the Scan Results but I didn't find any way to save it (I can't even copy/ paste it). Anyway, they infected some .exe files from:
D:\System Volume Information\_restore{58F204CF-792A-4D99-88ED-6CD0FBCE8D55}\RP5 and D:\System Volume Information\_restore{58F204CF-792A-4D99-88ED-6CD0FBCE8D55}\RP6 .

After my AntiVirus moved them to Chest I backed up my important documents on DVDs (photos, music and some IMs archive). I would like to know if these viruses can infect photos, music, and videos. I never used this computer for online banking or anything like that.
My computer wasn't too slow, just sometimes, when I had over 8 widnows opened, some programs running and windows media player playing music, the music was more slow than it should be. Now it seems to be alright but I wanna make sure if everything is ok.

Sorry if I made any spelling mistake but English is not my first language :) Thank you.

BC AdBot (Login to Remove)

 


#2 quietman7

quietman7

    Bleepin' Janitor


  • Global Moderator
  • 51,490 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Virginia, USA
  • Local time:04:57 PM

Posted 24 August 2011 - 01:04 PM

Win32:Vitro is the name (used by avast) for the Win32:Virut family of malware.

Virut is a polymorphic file infector with IRCBot functionality which infects .exe, .scr files, and opens a back door that compromises your computer. Using this backdoor, a remote attacker can access and instruct the infected computer to download and execute more malicious files.

-- Note: As with most malware infections, the threat name may be different depending on the anti-virus or anti-malware program which detected it. Each security vendor uses their own naming conventions to identify various types of malware.With this particular infection, the safest solution and only sure way to remove it effectively is to reformat and reinstall the OS.

Why? According to this Norman White Paper Assessment of W32/Virut, some variants can infect the HOSTS file and block access to security related web sites. Other variants of virut can even penetrate and infect .exe files within compressed files (.zip, .cab, rar). The Virux and Win32/Virut.17408 variants are an even more complex file infectors which can embed an iframe into the body of web-related files and infect script files (.php, .asp, .htm, .html, .xml). When Virut creates infected files, it also creates non-functional files that are corrupted beyond repair and in some instances can disable Windows File Protection. In many cases the infected files cannot be disinfected properly by your anti-virus. When disinfection is attempted, the files become corrupted and the system may become irreparable. The longer virut remains on a computer, the more critical system files will become infected and corrupt so the degree of damage can vary.

The virus disables Windows File Protection by injecting code into the "winlogon.exe" process that patches system code in memory.

CA Virus detail of W32/Virut

The virus has a number of bugs in its code, and as a result it may misinfect a proportion of executable files....some W32/Virut.h infections are corrupted beyond repair.

McAfee Risk Assessment and Overview of W32/Virut

There are bugs in the viral code. When the virus produces infected files, it also creates non-functional files that also contain the virus...Due to the damaged caused to files by virut it's possible to find repaired but corrupted files. They became corrupted by the incorrect writing of the viral code during the process of infection. undetected, corrupted files (possibly still containing part of the viral code) can also be found. this is caused by incorrectly written and non-function viral code present in these files.

AVG Overview of W32/Virut

Virut is commonly spread via a flash drive (usb, pen, thumb, jump) infection using RUNDLL32.EXE and other malicious files. It is often contracted by visiting remote, crack and keygen sites. These type of sites are infested with a smörgåsbord of malware and a major source of system infection.

...warez and crack web pages are being used by cybercriminals as download sites for malware related to VIRUT and VIRUX. Searches for serial numbers, cracks, and even antivirus products like Trend Micro yield malcodes that come in the form of executables or self-extracting files...quick links in these sites also lead to malicious files. Ads and banners are also infection vectors...

Keygen and Crack Sites Distribute VIRUX and FakeAV

However, the CA Security Advisor Research Blog have found MySpace user pages carrying the malicious Virut URL. Either way you can end up with a computer system so badly damaged that recovery is not possible and it cannot be repaired. When that happens there is nothing you can do besides reformatting and reinstalling the OS.

Since virut is not effectively disinfectable, your best option is to perform a full reformat as there is no guarantee this infection can be completely removed. In most instances it may have caused so much damage to your system files that it cannot be completely cleaned or repaired. In many cases the infected files (which could number in the thousands) cannot be deleted and anti-malware scanners cannot disinfect them properly. Security vendors that claim to be able to remove file infectors cannot guarantee that all traces of it will be removed as they may not find all the remnants. If something goes awry during the malware removal process there is always a risk the computer may become unstable or unbootable and you could loose access to all your data.

Further, your machine has likely been compromised by the backdoor Trojan and there is no way to be sure the computer can ever be trusted again. It is dangerous and incorrect to assume the computer is secure even if your anti-virus reports that the malware appears to have been removed.

Many experts in the security community believe that once infected with this type of malware, the best course of action is to reformat and reinstall the OS. Reinstalling Windows without first wiping the entire hard drive with a repartition and/or format will not remove the infection. The reinstall will only overwrite the Windows files. Any malware on the system will still be there afterwards. Please read:

Whenever a system has been compromised by a backdoor payload, it is impossible to know if or how much the backdoor has been used to affect your system...There are only a few ways to return a compromised system to a confident security configuration. These include:
• Reimaging the system
• Restoring the entire system using a full system backup from before the backdoor infection
• Reformatting and reinstalling the system

Backdoors and What They Mean to You

This is what security expert miekiemoes has to say: Virut and other File infectors - Throwing in the Towel?

If I guide someone with Virut (or any other File Infector) present and their Antivirus cannot properly disinfect it, then I recommend a format and reinstall...dealing with such infections is a waste of time and that's why I prefer the fastest and safest solution - which is a format and reinstall...After all, I think it would be irresponsible to let the malware "stew" (download/spread/run more malware) for another couple of days/weeks if you already know it's a lost case.

This is what Jesper M. Johansson at Microsoft TechNet has to say: Help: I Got Hacked. Now What Do I Do?.

The only way to clean a compromised system is to flatten and rebuild. That’s right. If you have a system that has been completely compromised, the only thing you can do is to flatten the system (reformat the system disk) and rebuild it from scratch (reinstall Windows and your applications).


In your case the detected _restore{GUID}\RP***\A00*****.xxx file(s) identified by your scan are in the System Volume Information Folder (SVI) which is a part of System Restore. The *** after 'RP' represents a sequential number automatically assigned by the operating system. The ***** after 'A00' also represents a sequential number where the original file was backed up and renamed except for its extension. To learn more about this, refer to:System Restore is the feature that protects your computer by monitoring a core set of system and application files and by creating backups (snapshots saved as restore points) of vital system configurations and files before changes are made. These restore points can be used to "roll back" your computer to a clean working state in the event of a problem. This makes it possible to undo harmful changes to your system configurations including registry modifications made by software or malware by reverting the operating systems configuration to an earlier date. See What's Restored when using System Restore and What's Not.

System Restore is enabled by default and will back up the good as well as malevolent files, so when malware is present on the system it gets included in restore points as an A00***** file. If you only get a detection on a file in the SVI folder, that means the original file was on your system in another location at some point and probably has been removed. However, when you scan your system with anti-virus or anti-malware tools, you may receive an alert that a malicious file was detected in the SVI folder (in System Restore points) and moved into quarantine. When a security program quarantines a file, that file is essentially disabled and prevented from causing any harm to your system. The quarantined file is safely held there and no longer a threat. Thereafter, you can delete it at any time.

If your anti-virus or anti-malware tool cannot move the files to quarantine, they sometimes can reinfect your system if you accidentally use an old restore point. If your anti-virus or anti-malware tool is able to move (quarantine) the file(s) let it do so. When an anti-virus or security program quarantines a file and moves it into a virus vault (chest) or a dedicated Quarantine folder, that file is safely held there and no longer a threat. The file is essentially disabled and prevented from causing any harm to your system through security routines which may copy, rename, encrypt and password protect the file the file before moving. Quarantine is just an added safety measure which allows you to view and investigate the files while keeping them from harming your computer. When the quarantined file is known to be malicious, you can delete it at any time by launching the program which removed it, going to the Quarantine tab, and choosing the option to delete.

In order to ensure all such files are removed, the easiest thing to do after disinfection is Create a New Restore Point to enable your computer to "roll-back" to a clean working state and use Disk Cleanup to remove all but the most recent restore point. Vista and Windows 7 users can refer to these links:When done, rescan with avast. If Win32:Vitro is detected again, then I recommend the reformat and reinstall.

Caution: If you are considering backing up data and reformatting due to malware infection, keep in mind, with file infectors, there is always a chance of backed up data reinfecting your system. If the data is important to you, then you can try to salvage some of it but there is no guarantee so be forewarned that you may have to start over again afterwards if reinfected by attempting to recover your data. Only back up your important documents, personal data files, photos, music, videos to a CD or DVD drive, not a flash drive or external hard drive as they may become compromised in the process. The safest practice is not to backup any executable files (*.exe), screensavers (*.scr), dynamic link library (*.dll), autorun (.ini) or script files (.php, .asp, .htm, .html, .xml) files because they may be infected by malware. Avoid backing up compressed files (.zip, .cab, .rar) that have executables inside them as some types of malware can penetrate compressed files and infect the .exe files within them. Other types of malware may even disguise itself by hiding a file extension or adding to the existing extension as shown here so be sure you look closely at the full file name. If you cannot see the file extension, you may need to reconfigure Windows to show file name extensions. Then make sure you scan the backed up data with your anti-virus prior to to copying it back to your hard drive.

If your CD/DVD drive is unusable or there isn't one installed, another word of caution if you are considering backing up to an external usb hard drive as your only alternative. External drives are more susceptible to infection and can become compromised in the process of backing up data. I'm not saying you should not try using such devices but I want to make you aware of all your options and associated risks so you can make an informed decision if its worth that risk.Again, do not back up any files with the following file extensions: exe, .scr, .dll, .ini, .htm, .html, .php, .asp, .xml, .zip, .rar, .cab as they may be infected.
.
.
Windows Insider MVP 2017-2018
Microsoft MVP Reconnect 2016
Microsoft MVP Consumer Security 2007-2015 kO7xOZh.gif
Member of UNITE, Unified Network of Instructors and Trusted Eliminators

If I have been helpful & you'd like to consider a donation, click 38WxTfO.gif

#3 Tina-

Tina-
  • Topic Starter

  • Members
  • 2 posts
  • OFFLINE
  •  
  • Gender:Female
  • Local time:11:57 PM

Posted 25 August 2011 - 04:41 PM

Thank you very much :) That helped me alot. This topic can be closed now.

#4 quietman7

quietman7

    Bleepin' Janitor


  • Global Moderator
  • 51,490 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Virginia, USA
  • Local time:04:57 PM

Posted 25 August 2011 - 08:29 PM

You're welcome.

:thumbup2: Tips to protect yourself against malware and reduce the potential for re-infection:

Keep Windows and Internet Explorer current with all security updates from Microsoft which will patch many of the security holes through which attackers can gain access to your computer. When necessary, Microsoft releases security updates on the second Tuesday of each month and publishes Security update bulletins to announce and describe the update. If you're not sure how to install updates, please refer to Updating your computer. Microsoft also recommends Internet 6 and 7 users to upgrade their browsers due to security vulnerabilities which can be exploited by hackers.

Avoid gaming sites, porn sites, pirated software (warez), cracking tools, and keygens. They are a security risk which can make your computer susceptible to a smörgåsbord of malware infections, remote attacks, exposure of personal information, and identity theft. In some instances an infection may cause so much damage to your system that recovery is not possible and the only option is to wipe your drive, reformat and reinstall the OS.

Avoid peer-to-peer (P2P) file sharing programs (i.e. Limewire, eMule, Kontiki, BitTorrent, BitComet, uTorrent, BitLord, BearShare). They too are a security risk which can make your computer susceptible to malware infections. File sharing networks are thoroughly infected and infested with malware according to Senior Virus Analyst, Norman ASA. Malicious worms, backdoor Trojans IRCBots, and rootkits spread across P2P file sharing networks, gaming, porn and underground sites. Users visiting such pages may see innocuous-looking banner ads containing code which can trigger pop-up ads and malicious Flash ads that install viruses, Trojans, and spyware. Ads are a target for hackers because they offer a stealthy way to distribute malware to a wide range of Internet users. The best way to reduce the risk of infection is to avoid these types of web sites and not use any P2P applications.
Beware of Rogue Security software as they are one of the most common sources of malware infection. They infect machines by using social engineering and scams to trick a user into spending money to buy a an application which claims to remove malware. For more specific information on how these types of rogue programs install themselves and spread infections, read How Malware Spreads - How did I get infected.

Keeping Autorun enabled on flash drives has become a significant security risk as they are one of the most common infection vectors for malware which can transfer the infection to your computer. One in every eight malware attacks occurs via a USB device. Many security experts recommend you disable Autorun as a method of prevention. Microsoft recommends doing the same.Note: If using Windows 7, be aware that in order to help prevent malware from spreading, the Windows 7 engineering team made important changes and improvements to AutoPlay so that it will no longer support the AutoRun functionality for non-optical removable media.

Always update vulnerable software like browsers, Adobe Reader, Adobe Flash Player and Java Runtime Environment (JRE) with the latest security patches. Older versions of these programs have vulnerabilities that malicious sites can use to exploit and infect your system and vendors regularly issue Security bulletins and advisories.
Use strong passwords and change them anytime you encounter a malware infection, especially if the computer was used for online banking, paying bills, has credit card information or other sensitive data on it. This would include any used for taxes, email, eBay, paypal and other online activities. You should consider them to be compromised and change all passwords immediately as a precaution in case an attacker was able to steal your information when the computer was infected. If using a router, you need to reset it with a strong logon/password so the malware cannot gain control before connecting again.

Don't disable UAC in Vista or Windows 7 and use Limited User Accounts in Windows XP.

• Finally, use common sense, safe computing and safe surfing habits provides the most complete protection.

Security Resources from Microsoft:Other Security Resources:Browser Security Resources:
.
.
Windows Insider MVP 2017-2018
Microsoft MVP Reconnect 2016
Microsoft MVP Consumer Security 2007-2015 kO7xOZh.gif
Member of UNITE, Unified Network of Instructors and Trusted Eliminators

If I have been helpful & you'd like to consider a donation, click 38WxTfO.gif




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users