How To Remove Trojan From A File

[Verbena Reynoso]

Evenin 2021, Trojans are still using deception and social engineering to trick unsuspecting users into running seemingly benign computer programs that hide malevolent ulterior motives. Trojans can download code or software that looks legitimate but, in reality, it will take control of your device and install malicious threats including malware, ransomware, and spyware.

There is a difference, though, between the free Trojan scanner our Malwarebytes Premium solution. The free Trojan scanner removes existing Trojans whereas Malwarebytes Premium proactively scans your device for Trojans to prevent them from doing harm.

This is similar to a file infecting virus. However in the case of a file infecting virus, the infected file can, in turn, infect other files. In the case of a "trojanized" or patched files the infection stops there and they can not infect other files.

This is actually one of the hallmarks that make the difference between an anti virus application and an anti malware application. An anti virus application should be able to remove malicious code that has been prepended, appended or cavity injected into legitimate files. The quality of which is determined by the anti virus application's ability to return the infected file to its preinfected state and its original preinfected checksum value.

While it is marginally possible for a legitimate file to become trojanized by more than one distinct trojan, it is very unlikely. The more interesting case, which is much more likely, is when a trojan is infected with a file infecting virus. This has been seen numerous times with IRC Bots that are infected with the Parite virus. However it is possible that just about any trojan from the ZBot to a Fakealert can be infected with a file infecting virus. I get fuzzy on this but if I recall, these may be known as a "Zapchast".

An important concept to realize is that a trojan is designed and created to be malicious from its inception. A trojan in itself is not "infected". It is the infector, It was designed to be malicious and can't be disinfected. A file that was infected with a file infecting virus or has been trojanized can be disinfected. However this is not always easy to do.

Wow, that's really interesting. So, If i were to somehow find an original copy of the file with no Trojans (as I know it does exist), could I replace it with this "trojanized" one and then use the program without risk?

NOTE: The OS can make this difficult as it tries to protect files that are a part of the OS. Third party applications don't have this issue but, at the same time, they are not the tragets to be trojanized. Windows core and kernel files are targets to be trojanized. Thus many trojans, whose functionality is to trojanize OS files, will disable or corrupt the System File Checker ( SFC ) sub-system.

So, before I try to figure this thing out I have one more question: I've been using a website called VirusTotal to help determine if files on my computer will have malware of any kind and it helped me find the trojanized file. Do you think it is accurate enough to completely assume that these files do indeed have trojans as it checks many different malware providers or do you think that I can take the risk anyways considering some of these anti-virus softwares don't detect the Trojan?

Some trojans download additional malware onto your computer and then bypass your security settings while others try to actively disable your antivirus software. Some Trojans hijack your computer and make it part of a criminal DDoS (Distributed Denial of Service) network.

Almost everyone who is at least a little tech savvy occasionally uses file-sharing websites. File-sharing websites include torrent websites and other sites that allow users to share their files, and this concept is appealing for a variety of reasons. First, it allows people to get premium software without paying the retail price. The problem though, is that file-sharing sites are also extremely attractive to hackers who want to find an easy way inside your system.

A countless number of popular programs and useful applications allow you to chat with others from your desktop. Bur regardless of if you use such software for business or personal connections, you are at risk of trojan infection unless you know how to protect yourself.

Many hackers target websites instead of individual users. They find weaknesses in unsecured websites which allow them to upload files or, in some cases, even take over the entire website. When this type of site hijacking happens, the hacker can then use the website to redirect you to other sites.

The hacker can compromise the entire website and redirect your downloads to a malicious server that contains the trojan. Using only trusted, well-known websites is one way to reduce your odds of falling into that trap, but a good antivirus program can also help detect infected and hacked sites.

I opened up Safari and straight away it started by a loading screen with a pop up window and a voice saying 'please contact this number' I forced quit Safari straight away and did an anti virus scan and it came up with 7 viruses - namely VBA:Downloader-AOV, others were the same but different three letters. Does anyone know how to remove these trojan viruses. The work computer uses AVAST for mac as the anti virus, and I'm not sure how you remove them.

The presence of viruses which tend to be for Windows computers and won't affect a Mac (unless you run Windows on it), and the message you are seeing, may be unrelated so you have two issues. Use ClamXAV to deal with the Windows things, check for your computer. Edit: It looks like Malwarebytes requires OSX 10.8 or greater.

Although you should remove any malware found, it is extremely unlikely that any of them caused the pop-up. Rather this is commonly caused by a javascript on the web site you visited, not anything on your computer.

Your issue doesn't appear to be caused by malware. If you don't need any of that account's files, log in with the administrator account, open the Users & Groups pane of System Preferences, and delete it.

I did delete the user. I had a guest user that I deleted as well. I rebooted, and put in a new 2ndary user, the same problems occurred, This is something very strange. When you log into the 2ndary, things look fine, then start to get weird fast, the Finder crashes/blinks on/off, same with Safari, Sys Pref. -- all crash immediately, so i can't even open any anti-virus app

but i checked today, there is a Guest User-- which I cannot delete/the '-' sign is greyed out at the bottom[next to the +] is that normal - to have a guest user, and it says it doesn't require a password

Windows Defender lacks many essential features that other free antiviruses offer, and it sometimes even blocks clean files that you can trust. For the best results, use a free trojan scanner and remover like Avast One.

Windows Defender lacks many essential features that other free antiviruses offer, and it sometimes even blocks clean files that you can trust. For the best results, use a free trojan scanner and remover like Avast Free Antivirus.

Yes, I know that adding some random PPA/software from an untrusted source is asking for trouble (or worse). I never do that, but many do (many Linux blogs and tabloids promote adding PPAs for fancy apps, without warning that it may break your system or worse still, compromise your security.)

It's always a game of cat and mouse with detection software. New malware is created, scanners get updated to detect it. There's always a lag between the two. There are programs that use heuristics that watch what software is doing and attempt to catch unwanted activity but in my opinion it's not a perfect solution and uses resources.

My advice is simple, don't install software from sources you don't trust but if you are like me and can't avoid the temptation, put them in a virtual machine (ie virtualbox) and play with it until you're confident it won't either bork your system or do things you didn't want.

Most anti-malware software for Linux/Unix simply searches for Windows malware. The occurences of Linux malware has usually been very limited, even in cases where the security updates are slow or don't come.

Second Look can verify the running kernel and processes.

Second Look uses memory forensics to directly inspect the operating system, active services, and applications.

It compares the code in memory to what has been released by the Linux distribution vendor. In this way it can immediately pinpoint malicious modifications made by rootkits and backdoors, and unauthorized programs (trojans, etc.).

I have the mindset that if you have run anything as root that you feel concerned about later, you should probably reinstall. any files you transfer should probably have the executable bit removed as well'chmod ugo -x'

Also you have the LiveGrid Feedback system disabled. I would recommend enabling it so that in case you encounter a new undetected malware or if there's a problem cleaning malware that is only partially detected (e.g. only on execution by Advanced memory scanner), the malware is submitted and a smart detection by all scanners is added.

Moreover, I would recommend considering upgrading your license to ESET Internet Security or ESET Smart Security Premium (also contains Disk Encryption and Password manager). Only these two can protect you also from bruteforce attacks (RDP, SMB, SQL,...) which is a common infection vector nowadays. A common scenario of attacks is as follows: Attackers bruteforce the password, connect remotely, disable antivirus, run ransomware and then extort money from the victim. Network attack protection also protects the machine from exploiting vulnerabilities in network protocols if the system is not patched.

Add to this OpenCandy is adware: -win32-opencandy/ . Per this Sophos detailed analysis of it; -us/threat-center/threat-analyses/adware-and-puas/OpenCandy/detailed-analysis.aspx, I would say it might be creating a virtual CDrom drive and running from that at boot time. If this is the case, what Eset online scanner is detecting is OpenCandy on the virtual CDrom; not in the MBR for the boot drive.

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