These are dangerous nonmemory resident polymorphic parasitic viruses. They searche for COM files, then write themselves to the end of the file. The virus polymorphic engine has bugs, and as a result in some cases the viruses corrupt files while infecting them. Depending on the system timer the virus displays the messages:
"Seeg.1422": -= [SEEG] Serg_Enigma EncryptioN GeneratoR v0.01 =-
"Seeg.1698": -= [SEEG] Serg_Enigma EncryptioN GeneratoR v1.0b =-
"Seeg.1870":
+----------------------------------+
| Serg Enigma present: |
| New MUTANT-VIRUS with [SEEG] |
| Serg_EnigmA EncriptioN GeneratoR |
| Version 1.0 beta 25.10.96 |
+----------------------------------+
