So the virus spreads to all files executed and also copied. The size of the virus code is quite small and it is about bytes.
The virus will not increase the size of the infected file. It uses an unique method to copy its code to the infected file. If the virus can not find a single continuous large enough empty space to copy itself, it will slice itself up to many pieces and place them in the smaller empty slots.
This virus is also known as Win Spacefiller for this behaviour. The virus alters the header entry point to the beginning of the virus code and builds the broken up parts to one piece of code when the EXE file is run.
The virus code contains the text "CIH", so it gets this name. CIH virus has a dangerous payload that will trigger on the 26th of April or any month, depending upon the variant of the virus strain. This virus can damage the contents of the BIOS flash memory chip.
CIH writes garbage to the flash memory chip if the chip is write-enabled. Many PC manufacturers leave the flash memory chip write-enabled. If this happens the computer will become unusable until the contents of the chip are restored or the motherboard is replaced. After damaging the BIOS the virus also makes the data in all the hard disks unreadable.
Because of these characteristics this is surely one of the most damaging virus. CIH virus first appeared in June and it is in the wild. Variants of CIH virus: There are three variants 1. CIH virus. These variants can be identified from the text string present in the virus code. The variants 1. HPS is a polymorphic virus. This virus also tries to hide from anti-virus programs by deleting the data files created by those programs. HPS virus is not in the wild. HPS and Hanta. This is a memory resident virus.
If a download does not include a boot floppy, please see Microsoft Windows Boot Disks. If the listed serials below do not work for a specific release, please see the Serials thread. Windows 95 has many issues on faster machines or VMs, requiring a number of patches in order to operate.
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