Natas.4744
Description Natas.4744
This is a dangerous memory resident multipartite polymorphic virus. It hooks INT 13h, 21h and writes itself into MBR of hard drive, boot sectors of floppy disks and at the end of COM and EXE files that are accessed. It does not infect the files that are opened by PKZIP/PKUNZIP, LHA and ARJ archivators. Depending on its internal counters the virus formats disk sectors. It contains the internal text strings:
BACK MODEM
Natas
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Annyit.656
Description Annyit.656
It is not a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of EXE files that are executed or opened. Depending on the system date it decrypts and displays the messages (some of these texts are corrupted):
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Ansi.881
Description Ansi.881
It's dangerous not memory resident overwriting virus. It searches for .ANS-files by using *.ANS mask, and overwrites them. On displaying of infected file (if ANSI driver is installed) the virus tries to rename host file to COM and execute it, then the virus displays the picture.
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