MegaBug.546
Description MegaBug.546
It is a dangerous memory resident parasitic encrypted virus. It hooks INT 21h and writes itself to the end of .COM files that are executed. On 28th of any month it erases the disk sectors. It contains the text string:
V.C.M-MEGABUG
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MtE.Pogue
Description MtE.Pogue
This is the first known real polymorphic virus. It is harmless and memory resident. It hooks INT 1Ch and 21h, and appends to COM files when they are started or closed. It plays a tune from time to time, and contains the following texts:
TNX2DAV
Pogue Mahone!
MTZ.1907
Description MTZ.1907
This is a benign memory resident parasitic polymorphic and stealth virus. Being executed it checks DOS version and installs itself as memory resident under DOS 5.0 or above. If there is free block of upper memory, this virus copies itself into UMB. This virus infects files on FindFirst/FindNext DOS calls. On opening an infected file the virus disinfects it.
The virus hooks INT 3, 15h, 21h. Interrupt 3 used as decryption routine, INT 15h handler calls trigger routine, INT 21h handler calls infection routine. This virus writes itself to the end of COM files. On warm reset (Alt-Ctrl-Del) it displays the message:
Y.K.K. - (c) M T Z - Italy!
Good Luck Today
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