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Gift.55 Viruses Information
| Name: |
Gift.55 |
| Category: |
Viruses |
| Description:
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Details
Gift.553
These are not dangerous memory resident parasitic viruses. "Gift.724" is encrypted. They hook INT 21h and write themselves to the beginning of COM files that are searched. While installing memory resident the viruses allocate a 64Kb block of DOS memory that may decrease the system performance.
The most interesting feature of these viruses is their structure: it follows the standard ZIP archives binary format. The beginning of virus code is very similar to ZIP header, and to the end of infected files a block of data is written that is similar to ZIP "end-of-archive" data. Despite on this, when infected files are run, these data are executed as a sequence of legal assembler instructions that pass control to the main virus code. As a result, the infected files can be not only executed as DOS programs, but also can be accessed as ZIP archives. These "archives" contains just one file named "SMF_Gift.com". Being "extracted" this file is the same as original contents of infected file. |
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