How To Disable Kaspersky Firewall

How To Disable Kaspersky Firewall – During a recent interaction, I was given a Windows tablet without the (best) tools installed and asked to test its security and how far I could go in compromising it. I had my own laptop, but I wasn’t allowed to connect directly to the internal network with it. But if I manage to compromise the tablet, I could use it as a C2. Long story short, getting the first shell was harder than having the network because of the antivirus(es) that had to be bypassed.


How To Disable Kaspersky Firewall

How To Disable Kaspersky Firewall

The CTRL+N shortcut to open a new page isn’t blocked though, bingo! We have a new site and internet access, great. I went to the URL bar and quickly

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Instead of going directly to the newly opened terminal, I tried clicking Windows Explorer to open it for GUI access to files and shares.

How To Disable Kaspersky Firewall

Nothing very interesting in terms of abuse that would give me a quick win. I was a domain-joined user with no administrative privileges, and I had many restrictive GPOs applied to the groups I belonged to. Regarding AV, Kaspersky Endpoint Security version and Windows Defender are installed.

One of my goals was to prove that I could bypass the AV by injecting an Empire implant and go from there. Since this test is not a red suit and has a time limit, I did not clone the tablet environment to run my tests. So I started by downloading the Empire Powershell launcher from a channel encrypted with Powershell’s Invoke-Expression:

How To Disable Kaspersky Firewall

Kaspersky Antivirus Review

And this would not have been detected by AV but probably by the firewall doing SSL inspection! So I needed a payload that could at least get past the firewall before executing in memory. To save you some time, I spent a whole day being detected by the firewall or AV, tired of getting warnings while sysadmins were very happy.

I knew that Windows Defender was installed on the tablet and KES11 took control of most of the anti-malware scanning. However, I learned the hard way that KES11 exploits AMSI’s detection of script-based attacks. In fact, they talk about the use of AMSI technology on their website, but only on the Kaspersky Security for Windows Server page:

How To Disable Kaspersky Firewall

Support for AMSI interfaces. The use of AMSI technology, which is integrated in Microsoft Windows, has led to the development of the mechanism to prevent script launches on the server. The stability of the Script Monitor task has been improved, the application’s impact on the environment has been reduced while scripts are caught and threats are blocked if detected, and the task scope has been significantly expanded – the Script Monitor component no longer works only with scripts in JS and VBS files, but also PS1 files. The functionality is available when the Script Monitor component is installed on servers running Microsoft Windows Server 2016 or later.

Bypassing Kaspersky Endpoint Security 11

A colleague recently shared an excellent blog post on how to bypass/disable the Anti-Malware Scanning Interface (AMSI) by patching memory with a non-elevated DLL: Bypass AMSI and execute ANY malicious powershell code

How To Disable Kaspersky Firewall

With that in mind, we have to bypass traffic control first, remember? Invoke-Obfuscation comes to the rescue. Compressing the Imperial charge a few times was enough to get him around.

I then downloaded the file to load it into memory with IEX. But now the traffic control was bypassed so the AV prevented the payload from executing (no surprise).

How To Disable Kaspersky Firewall

Kaspersky Internet Security Latest Version

What I learned during this job was that KES11’s heuristics or signature-based detections would fire on my payload before AMSI had even had a chance to examine the script. I had to compress the payload exactly 4 times before it bypassed the AV and was then detected by AMSI:

All that’s left is to disable AMSI and we’re good to go. I hosted the following code on a web server and downloaded it to the tablet using IEX:

How To Disable Kaspersky Firewall

Now that the payload is compressed 4 times and AMSI is disabled, we download the payload and execute it in memory:

Remote Administration Of The Application Through Kaspersky Security Center 11 Web Console

In the screenshot above, we can see that the KES11 detects compression of the payload up to 3x. For the 4th time the payload goes through the AV and we get a successful execution as AMSI is disabled: Antivirus software doesn’t have to be forever. If you want to turn off your software temporarily or permanently, you can do it through the antivirus program itself or through your device or browser. We’ll show you how to turn off the antivirus the way you want.

How To Disable Kaspersky Firewall

Tip: When it comes to antivirus running in the background on your device, closing the app isn’t always enough. Instead, you should completely turn off scans separately.

If you’re looking for another antivirus to replace your old antivirus, check out our list of the best antivirus for Mac or read about whether Macs really need antivirus software.

How To Disable Kaspersky Firewall

Kaspersky Total Security Review

Windows has built-in antivirus software, but if that’s not enough, learn more about the best antivirus software for Windows.

Notes: You’ll notice that we haven’t included instructions on how to turn off antivirus on your iPhone or iPad. This is because iOS devices like the iPad do not need antivirus software. If you’re not sure if you need it or not, “Do I still need antivirus software?” read our article.

How To Disable Kaspersky Firewall

Starting with Android 8.0, Android required apps to create a persistent (sticky) notification to keep running in the background. Without a persistent notification, Android will limit the application’s resources and even force the application to close after a while.16 This means that if you disable the persistent notification, antivirus applications will close. Here’s how you do it:

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On older Android versions, you can disable some antivirus apps by force closing them. However, the next time you start the app, the app will run again in the background. Follow these steps to force quit Android antivirus apps:

How To Disable Kaspersky Firewall

Now that we’ve told you how it happened, let’s ask why. Why would anyone want to turn off their antivirus in the first place? There are times when it may be appropriate to turn it off, such as when installing new programs. Your antivirus may prevent you from installing something, especially if you’ve downloaded it from the Internet. You may also want to disable your antivirus software when streaming or torrenting files, as this can slow things down a lot. Other than that, we recommend that you always keep your antivirus turned on. Although background scans may slow down browsing speed a bit, they are worth it as they protect against viruses and malware that can lead to hackers, data breaches and identity theft.

Maybe you want to turn it off because you are not satisfied with your antivirus software. If so, here are some things to consider when shopping for replacements:

How To Disable Kaspersky Firewall

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We can’t blame you for wanting to turn off your antivirus because it usually slows down connections. But you want protection from viruses, ransomware, spyware, adware and the like, so we hope you turn it back on at some point. Read answers to frequently asked questions about turning off your antivirus, or check out the best antivirus for Linux, the best antivirus for business, or the best free antivirus.

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