Unhandled Virus

Virus Name: Unhandled Aliases: V Status: New Discovered: February, 1995 Symptoms: .COM file growth; file date/time changes; message & system reboot Origin: Unknown Eff Length: 424 Bytes Type Code: PRaCK - Parasitic Resident .COM Infector Detection Method: F-Prot, IBMAV, AVTK, Sweep, NAVDX, VAlert, NAV, ViruScan, ChAV, NProt, IBMAV/N, AVTK/N, Sweep/N, NAV/N, NShld, Innoc 4.0+ Removal Instructions: Delete infected Files General Comments: The Unhandled virus was received in February, 1995. Its origin or point of isolation is unknown. Unhandled is a memory resident infector of .COM files, including COMMAND.COM. When the first Unhandled infected program is executed, this virus will install itself memory resident in allocated system memory, hooking interrupt 21. Total system and available free memory, as indicated by the DOS CHKDSK program, will not be altered. Once the Unhandled virus is memory resident, it will infect .COM files when they are executed or opened. Infected .COM files will have a file length increase of 424 bytes with the virus being located at the end of the file. The program's date and time will have been updated to the current system date and time when infection occurred. The following text string can be found at the end of all infected files: "æaisaK" The Unhandled virus will occassionally clear the system display and display a message which starts with the phrase: "Unhandled ..." A system reboot will then occur.