App Review Bitdefender Antivirus Plus vs CXK-NMSL ransomware

[dark_wielder]

Content source

https://www.youtube.com/watch?v=rCDe07Vsihs&feature=push-u-sub&attr_tag=ofFQI7NLCAPDHa1O%3A6

 

[harlan4096]

Yes, in defaults settings, of course...

 

[Tiamati]

all antivirus fail vs this malware.

Till now, it seems only Emsisoft blocked it

 

[Vitali Ortzi]

Till now, it seems only Emsisoft blocked it

Didn't wise vector / comodo cruel
And most venders with slightly tweaked settings?

 

[cruelsister]

Vitali- CF will block malware such as this without issue. Comodo has a setting (in Advanced Protection) for Script Analysis to be performed. This is enabled by default and will automatically shunt Scriptors of any sort into Containment. So while many must burden themselves with shutting off things like wscript, powershell, python, vbs, etc, CF already has protection against the malicious actions of these Scriptors.

Speaking specifically about CXK-NSML malware, understand that this thingy utilizes only valid Windows commands to do the damage and most Anti-Malware applications will be oblivious to any malicious actions by this script. CF, however, will laugh at it.

As an example of how various AV products handle batch scripts like CXK-NSML, you can test this easily (and safely) for yourself by running a simple Loop script. For instance, try running a simple batch file that does nothing other than open up an infinite number of calculators:

@ECHO off
:top
START %SystemRoot%\system32\calc.exe
GOTO top

Copy the above and save it as calc.bat

Run it (If the calculators start popping up on your desktop, a simple reboot will terminate the script without any ill effect).

This totally innocuous script will be ignored by most security products as it is legitimate (but really so is the certutil command of the CXK-NMSL malware) and will demonstrate a weakness in most AV products that is most definitely NOT shared by CF.

M

 

[SeriousHoax]

Till now, it seems only Emsisoft blocked it

Avast's behavior blocker blocks the sample cruelsister shared for testing in hub which I believe is like a variant of this ransomware.

 

[sepik]

How it can be detected, if its using legitimate certutil via .bat file? Most of the AV's does not scan inside .bat files, so they fail miserably.
Pretty much the same, if you rapidly encrypt small files with winrar or dos version of it. You can encrypt whole system easily, especially using DOS version of Rar.

 

[silversurfer]

is a a old chinese ransomware, is not the same

Please take the time to show me the hash of your claimed old Chinese Ransomware?
You probably just don't know what you are talking about...