Abba.9849.a
Description Abba.9849.a
ABBA is a memory resident parasitic virus. It "hooks" itself to INT 21h and writes itself to the end of .COM and .EXE files that are executed.
Abba contains the following internal text strings:
COMMAND.COM
Program too big to fit in memory
:ABBA+ƒ*.*
E:ABBA+ƒ
The virus creates "ABBA+ƒnn" files with HIDDEN and READONLY attributes on the current drive, where "nn" is the number of files to be infected on this drive (with each infection the virus renames the infected file with an increased "nn" number). Depending on this number the virus manifests itself with a video effect if there is a Hercules video card installed.
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Ontario Family
Description Ontario Family
These are harmless memory resident encrypted parasitic viruses. They hook INT 21h and write themselves to the end of COM and EXE files that are accessed, and the C:COMMAND.COM file.
Oolong.1380
Description Oolong.1380
It is a dangerous memory resident parasitic virus. It traces INT 13h, 21h, patches INT 2Ah (writes IRET instruction to INT 2Ah handler), hooks INT 21h and then writes itself to the end of .COM and .EXE files that are executed. The virus has the bug and halts the system while infecting any .EXE file. The virus contains the text string:
Oolong V2.0 virus by [E.K]
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