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Bombe Viruses Information
| Name: |
Bombe |
| Category: |
Viruses |
| Description:
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Details
Bomber
It's a harmless memory resident polymorphic virus. It hooks INT 21h and infects COM-file except COMMAND.COM on their running. It contains the internal text messages "COMMANDER BOMBER WAS HERE" and "[DAME]".
The characteristic feature of this infector consist of a new polymorphic algorithm. Upon infection the virus reads 4096 bytes from the random selected offset and writes this code at the and of the file. Then it writes into this 'hole' its code and starts to polymorphism. This virus contains several subroutines which generate the random (but successfully executed!) code. TRhe virus inserts those parts of random code into the random chosen position into the host file. About 90% of all the i8086 instructions are present in those parts. The part of code takes the control from the previous part by JMP, CALL, RET, RET xxxx instructions. The first part is inserted into the file beginning and jumps to next part, the next part jumps the third etc. The last part returns control to the main virus body. At the end the infected file looks like at 'spots' of inserted code. |
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