EXE Infections: Part 1 "Infection Process" Cont'
First thing to do is read the EXE header for the file to be infected! That can be resolved by...
Next, after reading the first 28 bytes, you will need to set your file pointers to the end of the file.
After bringing your virus to the end, you may start the infection process
;Remember BX = File Handle DX:AX Pointer Location (EOF)
The following finds new CS:IP and SS:SP registers. It will create a new segment, and CS:IP will point to the beginning of the Virus. If you have other code, and the virus beginning is further down the First byte, just add the number of Bytes to AX.
Now we are Ready to write the virus to the EXE File! (Yeah!)
This code works 100% as is! (Resident Virus) For Non-Residents add a location pointer! Besides, Why the Hell are you write a non-Ressy Virus? You Gay? LOL!!~
Stay RESIDENT in my site OKAY!!!~
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Next, after reading the first 28 bytes, you will need to set your file pointers to the end of the file.
After bringing your virus to the end, you may start the infection process ;Remember BX = File Handle DX:AX Pointer Location (EOF)
The following finds new CS:IP and SS:SP registers. It will create a new segment, and CS:IP will point to the beginning of the Virus. If you have other code, and the virus beginning is further down the First byte, just add the number of Bytes to AX.
Now we are Ready to write the virus to the EXE File! (Yeah!)
This code works 100% as is! (Resident Virus) For Non-Residents add a location pointer! Besides, Why the Hell are you write a non-Ressy Virus? You Gay? LOL!!~Stay RESIDENT in my site OKAY!!!~
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-Aparna
Theosoft