PHX

Threat description

Details

Category: Malware
Type: Virus
Platform: W32

Summary

This virus is quite common in South America, but isolated reports have been received from Northern Europe as well.



Removal

Automatic action

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.

More scanning & removal options

More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.



Technical Details

PHX stays resident in memory and infects COM and EXE programs when they are executed.

When PHX is infecting a file, it calls it by a name that has the "!" character appended to the end of the name, ie. FILE.EXE is called by the name FILE.EXE!, which works as well. This is done in order to by-pass some behaviour blockers that monitor access to files with executable extensions.

PHX alters one field in CMOS memory, and might cause CMOS corruption. The virus will also sometimes corrupt disk writes. This happens only when several conditions are met. These conditions include that an environment variable beginning with "PHX" is present, a certain INT call is made from within a certain type of program code and that an IN to port 03E4h returns anything else except the value FFh.

The activation routines are directed against applications written by a specific person and company.






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