Threat Description

HPS

Details

Aliases: HPS, Hanta
Category: Malware
Type: Virus
Platform: W32

Summary



HPS is a polymorphic Windows 95 virus which contains this text:

< Hantavirus Pulmonary Syndrome (HPS) Virus BioCoded by GriYo / 29A >



Removal



Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



Technical Details



HPS stays active in memory and infects Win32 EXE files as they are accessed, encrypting its own code with variable polymorphic encryption layer.

HPS activates on Saturdays. If a non-compressed Windows bitmap (BMP) file has been opened, the virus horizontally flips the picture. HPS patches the value DEADBABE (in hex) to the end of the bitmap header area to avoid flipping the same image again. Since non-compressed bitmap files are frequently used by Windows 95 and 98, this causes all kinds of weird effects - such as the start-up and power-down screen of Windows being "mirrorized".

See also: Marburg





Technical Details: Peter Szor, F-Secure, 1997


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