OS2.Jiskefet
Description OS2.Jiskefet
It is a harmless nonmemory resident parasitic virus. It searches for NewEXE (LX) files, reads 2048 (800h) bytes from the file beginning, writes that data to the end of the file, and then writes itself to 2048 bytes of the file header. Then the virus creates a temporary file, copies the host file there, disinfects and executes that file. Then the virus returns control to the system.
While searching and infecting the files, the virus uses OS/2 calls:
DosExit DosChgFilePtr DosClose DosDelete DosFindClose DosFindFirst
DosFindNext DosNewSize DosOpen DosGetEnv DosRead DosWrite DosExecPgm
The virus contains the text strings:
Jiskefet
DOSCALLS
*.EXE
MK
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ByXute.1056
Description ByXute.1056
It is a dangerous memory resident encrypted parasitic virus. It hooks INT 21h and writes itself to the end of EXE files that are executed. On 31st of any month the virus deleted files that are executed, erases boot sector on the of current drive and displays the message:
IvU
The virus also contains the text:
By XUTE!!
C0m.263
Description C0m.263
This is a non-memory resident, very dangerous virus. It searches for .COM-files and overwrites them. On Tuesday, it renames the COMMAND.COM file to a new name: COMMAND.C0M and then types:
Error reading drive C:
BillMeTuesday!
On other days, it types: "EXEC Failure".
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