You have been re-routed to the Backdoor:Win32/Fynloski.A write up because Backdoor%3aWin32%2fFynloski.A has been renamed to Backdoor:Win32/Fynloski.A


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

The following free Microsoft software detects and removes this threat:

Even if we've already detected and removed this particular threat, running a full scan might find other malware that is hiding on your PC.

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

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

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:

Threat behavior

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

It has different file names. It creates an entry in the Windows registry to make sure it runs every time Windows starts, and that you're not aware that it's running.

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

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: 1.177.2438.0 and higher
First detected on: Nov 10, 2010
This entry was first published on: Feb 10, 2011
This entry was updated on: Apr 14, 2014

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)