Microsoft security software detects and removes this threat.

This trojan can give a malicious hacker access to your PC. They can then control your PC and steal sensitive information.

Find out ways that malware can get on your PC.

What to do now

Use the following free Microsoft software to detect and remove this threat:

You should also run a full scan. A full scan might find other, hidden malware.

Protect your sensitive information

This threat tries to steal your sensitive and confidential information. If you think your information has been stolen, see:

You should change your passwords after you've removed this threat:

Get more help

You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.

If you’re using Windows XP, see our Windows XP end of support page.

Threat behavior

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

This threat can create files on your PC, including:

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

In subkey: HKCU\software\microsoft\windows\currentversion\run
Sets value: "Macrovision Security Driver"
With data: "%APPDATA%\microsoft\lookupsvi.exe"

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


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
  • using port 200
Malware can connect to a remote host to do any of the following:
  • Check for an Internet connection
  • Download and run files (including updates or other malware)
  • Report a new infection to its author
  • Receive configuration or other data
  • Receive instructions from a malicious hacker
  • Search for your PC location
  • Upload information taken from your PC
  • Validate a digital certificate
Additional information

Creates a mutex

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


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


Alerts from your security software may be the only symptom.


Alert level: Severe
First detected by definition: 1.93.1605.0
Latest detected by definition: 1.211.853.0 and higher
First detected on: Nov 10, 2010
This entry was first published on: Feb 10, 2011
This entry was updated on: Aug 13, 2015

This threat is also detected as:
  • W32/Fynloski.Q (Norman)
  • BDS/Bancodor.A (Avira)
  • BackDoor.Comet.origin (Dr.Web)
  • Backdoor.Win32.Bancodor (Ikarus)
  • Backdoor.Badcodor (Symantec)
  • BKDR_COMDAR.SMI (Trend Micro)