Trojan.Downloader.JPUY is distributed in a file named 'hpupdate.exe'. Once installed on a machine, the trojan-downloader attempts to contact a remote server to download a file. It is also able to upload arbitrary files from the machine to the remote server.

Automatic action

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.

Suspect a file is incorrectly detected (a False Positive)?

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 detection database 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.

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Submit a sample

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Technical Details

Trojan.Downloader.JPUY is distributed as an executable program with the filename, 'hpupdate.exe' (SHA1:9a0386dc813407ae7073ed148161c65caf499874).

This filename is the same as a legitimate software update program for Hewlett-Packard printers, and is likely used to trick users into believing that the trojan-downloader is authentic.


If the malicious program is installed onto a machine, it creates a batch file and installs itself at the following location:

  • C:autoexec.bat

This ensures that the trojan-downloader is automatically launched at each system startup.

The trojan-downloader also checks for and, if necessary, creates a mutex object (straightforwardly named 'Mutex') to prevent re-infection of a machine that has already been infected by the same malware.

File download and upload

Once the trojan-downloader is installed and running on the machine, it attempts to contact a remote command and control server, report its status and download a file:

  • w w w.musicfile[obfuscated]/doc/<17-digit-random-number>.html

If the file is successfully downloaded, the trojan-downloader then executes it on the machine.

The trojan-downloader is also able upload arbitrary files on the infected machine to its command and control server.


In the sample analyzed, the malware also harvested browsing history details from the web browser on the infected machine.