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Aliases :

Backdoor:W32/Ptsnoop, Backdoor:W32/Ptsnoop, Backdoor.Ptsnoop


A remote administration utility that bypasses normal security mechanisms to secretly control a program, computer or network.


Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

Ptsnoop is a simple backdoor program written in Visual Basic.

Please note that certain software packages for certain modems contain PTSNOOP.EXE files, but these are not trojans. If you are not sure if that file is a trojan or not, use F-Secure Anti-Virus to check it out.


When activated it first looks for active RAS connections and exits immediately if none is found.

If a connection is present, the backdoor installs itself to system by copying itself as PTSNOOP.EXE file to \Windows\System\ directory and modifying WIN.INI file. The backdoor adds its execution string after LOAD= variable in [Windows] section of WIN.INI file.

During this operation, the WIN.INI file is copied to the WIN.ANA file. The backdoor's execution string is then added and WIN.INI file is deleted. Then WIN.ANA file is renamed to WIN.INI file. This way the backdoor will become active every time Windows starts.


Being active the backdoor tries to connect to the following websites:


When the connection succeeds, the backdoor clips cursor to a certain area and allows a hacker or script on these websites to control mouse movement and window positions. It is not clear why this is done and it is impossible to check any more because the contents of the above mentioned websites were changed or removed.

The idea might have been to make a user click on certain areas of a website to download or run a script or binary from there. In any case, this backdoor should be deleted from a system and WIN.INI file should be cleaned from backdoor's execution string after LOAD= variable.