SemiSoft

Threat description

Details

Category:
Platform: W32

Summary

This virus infects Windows EXE files. It spreads natively under Windows 95 and NT (making it the fourth known Windows NT -specific virus).



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

After infecting a machine and waiting for some time, the virus sends a "ping" to four IP addresses located in New Zealand to announce which machines it has infected. After this, the infected machines open up port 531 for incoming connections, and the machines can be controlled by sending commands to this port.

There are several variants. The first 60416 byte variant contains these texts:

mylen=, c:\testexe.exe, NOTEPADX.EXE, NOTEPAD.EXE, SETUP.EXE,         EXPLORE.EXE, EXPLORER.EXE, WINIPX.EXE, WINIPXA.EXE,         WINSRVC.EXE, E5.2, DEBUG, IMPL=         ETHP v5.2         \IDENT.TXT  

When the virus is active, it is visible in the process list as a number, typicly "6.666". When exiting Windows, NT sometimes complains it can't close a task by this name.

SemiSoft was known to be in the wild in the end of 1997 and beginning of 1998.

[MHH//DF]






SUBMIT A SAMPLE

Suspect a file or URL was wrongly detected? Submit a sample to our Labs for analysis

Submit Sample

Give And Get Advice

Give advice. Get advice. Share the knowledge on our free discussion forum.

Learn More