Keypress.Ufo
Description Keypress.Ufo
It's a not dangerous memory resident multipartite virus. It hooks INT 13h, 1Ch, 21h. By hooking INT 21h this virus writes itself at the end of COM- and EXE-files are accessed. On infection of any file the virus tries to infect COMMAND.COM file. By hooking INT 13h it hits boot sectors of floppy disks. By hooking INT 1Ch this virus manifests itself by a video effect: it decrypts and displays the messages:
The U F O Club
UFO-4 By Faisal-Andre-Akhmad Klp Gading Jakarta Utara
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Nax.1402
Description Nax.1402
It is not a dangerous memory resident encrypted parasitic virus. It hooks INT 9, 21h, 4Bh and writes itself to the end of COM and EXE files that are executed. INT 4Bh is used for "Are you here?" call when the virus installs itself memory resident. By hooking INT 9 (keyboard) the virus depending on its counters replaces the keystrokes:
<-> /
: <-> ;
< <-> >
( <-> )
[ <-> ]
, <-> .
9 <-> 0
F5, F6 -> F8
F8 -> F6
Nazgul Family
Description Nazgul Family
These are harmless nonmemory resident parasitic viruses. They search for .COM files, then write themselves to the beginning of the file. The viruses contain the texts:
"Nazgul.209": *.COM
"Nazgul.266": *.COM Nazgûl
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