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Backdoor:Win32/Fynloski.A

First posted on 15 February 2019.
Source: Microsoft

Aliases :

Backdoor:Win32/Fynloski.A is also known as W32/Fynloski.Q, BDS/Bancodor.A, BackDoor.Comet.origin, Backdoor.Win32.Bancodor, Backdoor.Badcodor, BKDR_COMDAR.SMI.

Explanation :

Fynloski.A is a repackaged version of a remote access tool (RAT) and might come in a variety of installer types.

Installation This threat can create files on your PC, including:   %APPDATA%microsoftlookupsvi.exe %APPDATA%microsoftsecdrv.exe %USERPROFILE%desktoporder.exe

It modifies the registry so that it runs each time you start your PC. For example:

In subkey: HKCUsoftwaremicrosoftwindowscurrentversion
un
Sets value: "Macrovision Security Driver"
With data: "%APPDATA%microsoftlookupsvi.exe"

The malware uses code injection to make it harder to detect and remove. It can inject code into running processes.

Payload

Allows backdoor access and control

Fynloski.A lets a malicious hacker remotely access your PC. It can let the malicious hacker do any of the following:

Capture video from your webcam Control the clipboard Control the mouse, including the clicks Display a message box Download and run files Gather information about your PC Hide the operating system's default screens and windows Open and close the CD-ROM drive door Record sound produced by the PC Record keystrokes Set a custom background Steal passwords from known applications Type text on the screen

Collects your sensitive information

This threat can collect your sensitive information without your consent. This can include:

The keys you press Your web browsing history Your credit card information Your user names and passwords

It could also imitate a legitimate website to lure you into revealing your sensitive information.

Connects to a remote host

We have seen this threat connect to a remote host, including: slimx.comule.comusing port 80 slimmy.noip.me using port 200 Malware can connect to a remote host to do any of the following:Check for an Internet connectionDownload and run files (including updates or other malware)Report a new infection to its authorReceive configuration or other dataReceive instructions from a malicious hackerSearch for your PC locationUpload information taken from your PCValidate a digital certificate Additional information

Creates a mutex

This threat can create a mutex on your PC. For example:

DC_MUTEX-SWNQ6GE

It might use this mutex as an infection marker to prevent more than one copy of the threat running on your PC.

Analysis by Daniel Chipiristeanu

Last update 15 February 2019

 

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