Questions tagged [antivirus]

Antivirus or anti-virus software is used to prevent, detect, and remove malware, including but not limited to computer viruses, computer worm, trojan horses, spyware and adware.

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What is the use case for antimalware manual scans?

I am not able to understand what use is the manual antimalware scan? All antivirus software has a manual anti-malware scan. I understand if it's the first time someone installs it on their infected/...
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Does malware that comes through outdated apps go away if I uninstall the apps?

I was reading this and this article. The first article itself is about why software updates are extremely important for security, and the second one also mentions the following: "Make sure your ...
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What is the limit in MB for an AntiVirus to not scan a potential malware?

When downloading from Google Drive, sometimes I have seen a notification that said that Google Drive couldn't scan the file I was downloading because it was big to scan. For a fact, I know that Google ...
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Making My Own Custom Payload

I have tried many different tools to avoid being detected by an AV while using meterpreter exploit. Here is a list of tools I have tried: Shellter, Posh C2, Hack the World, Veil, Fat Rat, and many ...
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Why does Kaspersky anti-virus not consider this executable as malicious?

I was trying to learn file I/O and related function in C, and thus tried to create a baby-version of a virus. Following is the exact code: #include <stdio.h> #include <stdlib.h> int main(...
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Virus scanning uploaded images to database

I have a database for a chat app to which users can upload images. These images get scanned before they are made available to other users in a conversation. But when the antivirus gets an update, ...
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Why do Windows AV software detect strings with case-sensitivitely?

As Windows is case-insensitive, the string mimikatz can be evaluated the same as MIMIKATZ or MimIkaTZ. A naive method of AV evasion by switching cases of some characters in suspicious string has been ...
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166 views

Is it safe to use an executable if only unknown antiviruses detected something?

Recently I downloaded Open Shell application and checked it via VirusTotal. Most famous antiviruses like Bitdefender, Nrothon, Kaspersky found nothing. But some of antiviruses thing there are some bad ...
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How can antiviruses protect our computers if virus maker checks them with antiviruses?

I would like to know if we can really trust antiviruses because virus makers check their virus with antiviruses before releasing them. So how can we place our confidence in antiviruses?
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Is there any proof in support of these basic security guidelines?

The Tech Solidarity organization provides a list of basic security guidelines, described by Jeff Atwood as ... pure gold and has been vetted by many industry professionals ... From that same ...
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How to prevent amsi bypass powershell Windows 10

I have found a well known way to bypass an antivirus solution and run well known malicious powershell scripts. The method is the 6+ year old way of shutting down amsi and running the powershell script ...
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Remote Access Trojan (RAT) — How to detect, how to remove [duplicate]

Is there a guaranteed way to: Know there is a Remote Access Trojan in my PC? Remove it completely and successfully from my PC? Note: Assume that the hacker doesn't leave any hint of their activity (...
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Why does my antivirus keep alerting me that someone attempted to remote access my computer?

I have purchased AVG's premium service to use on a Windows 10 operating system, but it almost seems like since I have gotten it, (had it for about a month now) it keeps alerting me that it has blocked ...
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Virtual machine protection

Let's say I have VirtualBox or Vmware Workstation on a Windows 10 Pro host, hosting Windows or a Linux distribution such as Ubuntu or CentoS). If I have an antivirus or Internet Security software on ...
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157 views

Obfuscating an .exe file

Is there a way to obfuscate an existing .exe file? I'm in a situation where I cannot transfer the winPEAS.exe file (for PrivEsc purposes) on a Win10 machine because of the AV blocking the executable. ...
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Antivirus evasion for reverse tcp

I'm trying to do reverse tcp in an exe payload. To do antivirus evasion, I've tried to use Veil evasion, The fat rat, and also Phantom evasion, but even if the exe wasn't deleted by antivirus (I use ...
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Wiping a hard drive before reinstallation

A few years ago, I left a new laptop at a sketchy computer shop to downgrade the OS to Windows 7. The experience was a disaster. My goal now is to install Cinnamon Linux on the laptop and remove ...
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Does SandBoxie have a virus?

When I try to download SandBoxie in the 64-bit version, at this link: SandBoxie and I analyze it with VirusTotal, it tells me that it's safe, but when I analyze some relative files, called: ...
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Why don't antivirus definition files get detected as malware

I was wondering... if antiviruses store virus definition files that contain virus signatures then why wouldn't they get detected as malware by themselves or Windows Defender or any other AV out there?
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How do EDR prevent you from uninstalling even as local admin?

I have an CrowdStrike EDR and it seems like the only way to disable this on all OS is to provide maintenance-token or ask CrowdStrike to disable the defences so you can uninstall it. I also have a ...
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Using other programming languages for malware against EDR?

As an example, one of the most basic malware to inject into a process to get a C2 beacon goes like this: Get Handle of a process -> VirtualAllocEx -> WriteProcessMemory -> CreateRemoteThread ...
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What does the bizarre text mean at VirusTotal?

I downloaded Bitcoin Core from here: https://bitcoin.org/bin/bitcoin-core-0.20.0/bitcoin-0.20.0-win64-setup.exe I then uploaded it to VirusTotal: https://www.virustotal.com/gui/file/...
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How am I supposed to interpret a VirusTotal result of “some engines think this is malware”? [closed]

I just scanned another installer/EXE with VirusTotal. I've come to depend on this crappy service owned by the evil Google, in spite of its ambiguous messages and extremely confusing interface, because ...
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How Do I Recover Files That Have Been Replaced By a Virus and Get Rid Of The Virus? [duplicate]

I was trying to open Adobe After Effects recently but it was taking a lot of time to load. I checked task manager and found several instances of the background process "Ashampoo Snap" opened....
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Invisible virus [duplicate]

Recently my brother brought a usb from his friends to copy stuff from and ended up infecting my pc in the process. I tried to solve the problem by installing kaspersky and doing a full scan of my ...
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API GET Request resulted in a Bitdefender thread alert

This is a very strange occurrence and could be a false alarm. I am testing an API from an advertisement network for my WPF desktop app. I made a GET request to this exact test link (generic sample ...
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Understanding Antivirus Sandbox limitations

The most advanced antiviruses fight against malware with different techniques, like signature-based detection and heuristic analysis. In case those two are bypassed by the malware, there is still the ...
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Porbable virus in Windows 10 [duplicate]

I have a windows 10 machine with AVG Free antivirus. Lately everytime I boot the machine up as soon as it gets to the desktop Chrome opens up on its own with a suspicios add to download stuff I do not ...
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Why don't antivirus detect malicious XSS files?

I have a system with an uploading file feature and it's protected by an antivirus that scans the uploaded files. The AV detects malicious files like EICAR files, msfvenom payloads...but not a JS file ...
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Determining if software installed onto vm is malware or not

I've tried searching for methods of scanning files within virtualbox, but most (if not all) of what I find is discussion about studying programs that are already known to be malware. I'm trying to ...
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Gmail warns about encrypted PDF file

I recently received a PDF file that, when attached to a gmail message, causes a warning to be displayed as follows: Encrypted attachment warning – Be careful with this attachment. This message ...
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Anti virus vs Anti malware? [duplicate]

What is the difference in anti malware like malwarebytes premium and an anti virus? Do I need both or would malwarebytes be enough?
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What's considered a threat? [closed]

I have troubles to understand what is exactly a threat. If I've an antivirus able to catch some malware, is this malware still considered a threat to my computer.
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Windows Defender found threats in Kali Linux disc image

Last week, I downloaded Kali Linux from the official https://www.kali.org/ website for educational purpose. I left the downloaded disc image (.iso) on my desktop. Yesterday, Windows Defender decided ...
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1answer
110 views

Would an anti-virus software make any other processes consume more CPU?

Would an anti-virus software make any other processes that it scans to consume more CPU? We recently switched to a new Next-Gen, AI based Anti-Virus software. On couple of our Linux servers that runs ...
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Does antivirus software detect screen grabbing functionality in a running program?

Let's say a malicious actor publishes a piece of software that calls a screenshot function (e.g. Graphics.CopyFromScreen() or the UIAutomation Framework in .NET) every so often, but doesn't notify ...
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280 views

What are the benefits of enabling antivirus full scanning?

If AV auto-scan will detect and prevent the malware from executing why there is a need to enable schedule/full scans? I'm asking because a full scan can create sometimes overhead on the machine and ...
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434 views

Bypass AMSI Windows 10

I'm trying to run a powershell reverse shell on windows 10. Anyway everytime it is blocked by Wndows Defender. How can I bypass it? In a file I store the payload $client = New-Object System.Net....
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44 views

Shell scripts scanning tools

It has become common trend to use shell scripts from the web and directly run them: bash <(curl -sL some.random.website.com) I always view the script before running them. However, shell scripts ...
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157 views

Why does Kaspersky blocks a website saying untrusted root center

Why does Kaspersky antivirus blocks the website saying that it has untrusted root center when the root CA is Kasperksy itself and also the certificate status seems to be "OK". Figure-1 shows the ...
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1answer
116 views

Securely analyze and format a USB flash drive

I need to scan the contents of a USB stick with several antivirus software. I have several ways to do this. Either I mount the key, I scan its contents (I may place the suspicious files in ...
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1answer
203 views

What is the difference between a server and an appliance for PCI purposes?

I administer a few hundred servers and am going through a yearly PCI audit. This time around we need to prove that we've got anti-virus protection on our "systems commonly affected by malicious ...
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1answer
163 views

Is malware programmed in high-level language will be more detected than malware programmed in low-level language?

I would like to know if a simple malware designed to execute commands received by a C&C will have the same result rate if programmed in : lower-language like C++ high-language like Python (...
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1answer
1k views

Program compiled with mingw32 is reported as infected

I'm using a Linux system and cross-compiling to Win32. The most trivial Windows source code ("Hello world" by Petzold), when compiled using i686-w64-mingw32-gcc (gcc version 7.3-win32 20180312), ...
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1answer
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As a Software Industry Editor, how to avoid my software being quarantined?

I'm a well established software company. For more than 30 years, my business has been delivering both hardware and software. My Windows software is being quarantined by some of my customer's ...
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881 views

How can Avast detect threats when I install Kali on VirtualBox?

I was installing Kali on VirtualBox on a W7 host, and during the upgrading/installation, Avast detected two threats in the Mimikatz package. My question is, how can Avast "see" through the VM? Is he ...
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How does Antivirus identify virus using signature-base? [duplicate]

I have read many articles about AV signature-based but I'm still not clear how AV using Hash to compared with the signature.
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Does a Windows 10 endpoint check software installations for malware if they are installed through GPO / SCCM / Software Center?

I'm trying to get a view on what extra security checks our packaging team could do when they download a potentially infected installer from the web before they package an MSI or EXE (assuming that the ...
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298 views

Is it secure to use TOR with AVAST antivirus?

Today when I opened an incognito session in Chrome Browser, I got an immediate pop-up from Avast antivirus: Should I be concerned that my antivirus is acting like spyware? I sometimes use the TOR ...
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How to test an enterprise antivirus

In our enterprise we have an antivirus solution but we are evaluating to pass to another solution. What could be a good strategy to test on our enviroment what antivirus solution works better?

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