These are memory resident encrypted parasitic viruses. They copy themselves to the Interrupt Vectors Table, hook INT 21h and then write themselves to the end of COM files that are executed.
TNSE.Eat.381
This is a very dangerous virus. Under pure DOS it corrupts files while infecting them, it replicates itself correctly when a memory manager like QEMM or Windows is run. The virus contains the text:
Signature:[EAT SPiCE & Die] by TNSe/LT
TNSE.Faen.450
It is a dangerous virus - under some conditions (under debugger? being cleaned by heuristic cleaner?) it tries to overwrite the A: drive boot sector with a program that displays on booting:
NO ROM BASIC
The virus fails to do that - there is INT 21h call instead INT 13h. The virus then reboots the computer.
The virus also contains the text:
[(FY) FAEN V1.0 BY TNSe / DC]
