Implementation of Silvio Cesare text infection technic.
Current implementation is for infecting ELF64 files.
You should not use it for creating small viruses but only to know how this technic works.
1- Increase the section header offset by PAGE_SIZE in the ELF file header.
2- Locate the text segment program header:
- Modify the entry point to the parasite location.
- Increase file size and memory size in the text segment program header by the size of the parasite.
3- For each program header whose segment is after the parasite, increase it's offset by PAGE_SIZE.
4- Find the last section header in the text segment and increase it's size by the length of the parasite.
5- For every section header that exists after the parasite insertion, increase it's offset by PAGE_SIZE.
6- Insert the parasite code into the text segment.