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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Can Kaspersky's default encrypted connection scanning exclusion list be modified by end user? [migrated]

I am just wondering whether can I modify the Kaspersky's default encrypted connection scanning exclusion list itself, without any sites being added to or removed from the "Trusted Address". ...
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37 views

Bypass Windows Defender [closed]

I am currently working on my own RAT and I got a FUD reverse shell. But I have a problem. I can only connect to the shell with netcat. But I want to use Meterpreter because I can do more things with ...
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How to run PrintSpoofer in memory from powershell?

PrintSpoofer uses named pipe impersonation to elevate on Windows 10 to SYSTEM from a user with SeImpersonatePrivilege (Local Service, Network Service, Administrator etc.). The compiled version is ...
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How to know if I had scanned a file on VirusTotal? [closed]

A few weeks ago, I was using VirusTotal to check a few files on my computer to see if they were viruses. But I do not remember if I had scanned a particular file. Is there is a way to check that? And ...
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88 views

If a file has previously been scanned by VirusTotal, will the VirusTotal website always indicate this fact?

I recently downloaded a very popular open-source application. Usually, I compile open-source applications myself after reading the source code. But my compiler box was busy with many tasks, so I ...
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4answers
213 views

Can a antivirus software detect a malware that steals data?

For example, consider a software that wants to package all txt files in the /user/Desktop directory and upload them to its own server. I am not a programmer, but I know it can be done very easily with ...
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1answer
91 views

Can a hacker install known-vulnerable software on a machine in order to control the PC and elude antivirus?

I recently discovered that on one of my PCs the SolarWinds software was installed. I didn't install this software on my machine. I also saw that SolarWinds was cracked by Russian hackers and also ...
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1answer
85 views

How to evaluate anti-virus solutions [closed]

Some people want to know what is the "best antivirus", I am a little disappointed and it's difficult for me to answer this question. I think Windows Defender is good but I can't give ...
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1answer
94 views

How does malware avoid AV's when using a simple DLL injection technique?

As far as I understand it, a simple approach for a malware DLL injection would require 2 DLLs. The first for the DLL side loading, while the malicious DLL remains encrypted. And then this 'loader' ...
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3answers
93 views

Is is safe to skip virus scanning for image files?

Among other things, I use clamscan on my web servers website directories to help find compromised websites. Unfortunately the time to do this scan is becoming onerous. Are there any good reasons not ...
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Norton detects intrusion attempt from virtual machine - how is this possible?

Sometimes I have to fix an infected WordPress website. I always check the infected website from a virtual machine (Oracle VM VirtualBox). I'm also running Norton 360 DeluXe on the host machine. In the ...
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Trojan “Win32/Tnega!MSR” found by Windows Defender - aliases used by other antiviruses?

Recently I had a Windows 10 (64 bit) PC where Windows Defender would report that if found and (apparently) removed a "threat" it calls Win32/Tnega!MSR. Unfortunately, the removal was ...
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Are there some viruses that write assembly code instead of machine code, and use an external assembler?

Like the question says, I am wondering if there are some viruses that do not write machine code themselves, but instead output assembly code and invoke an external assembler? That sounds like a ...
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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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2answers
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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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154 views

Making My Own Custom Payload [closed]

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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1answer
128 views

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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1answer
78 views

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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709 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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1answer
103 views

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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310 views

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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111 views

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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1answer
116 views

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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340 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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108 views

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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91 views

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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151 views

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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152 views

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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389 views

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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43 views

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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2answers
60 views

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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73 views

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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42 views

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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1answer
89 views

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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1answer
67 views

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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7k views

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
150 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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2answers
101 views

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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5answers
340 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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1answer
750 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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