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.
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.
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:
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.
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:
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.
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