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Details
Ezt.977
It is a very dangerous memory resident parasitic virus. It hooks INT 21h and on ChangeDir DOS call searches for .COM files and writes itself to the end of the files. When the PKZIP or ARJ utilities are compressing .COM and .EXE files into an archive, the virus overwrites the read/write buffer with a trojan program. As a result, the original files stays the same, but the compressed files in the archive are corrupted - they are overwritten with this trojan. When such corrupted file is executed, that trojan program displays the message:
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