SillyCER Virus

Virus Name: SillyCER Aliases: SillyCER.307 V Status: New Discovered: July, 1995 Symptoms: .COM & .EXE growth Origin: Unknown Eff Length: 307 - 321 Bytes Type Code: PRaAK - Parasitic Resident .COM & .EXE Infector Detection Method: F-Prot, AVTK, VAlert, Sweep, NAV, NAVDX, IBMAV, ViruScan, PCScan, ChAV, Sweep/N, NAV/N, IBMAV/N, AVTK/N, NShld, NProt, Innoc 4.0+ Removal Instructions: Delete infected files General Comments: The SillyCER or SillyCER.307 virus was received in July, 1995. Its origin or point of isolation is unknown. SillyCER is a memory resident infector of .COM and .EXE programs, including COMMAND.COM. It doesn't do anything besides replicate. When the first SillyCER infected program is executed, this virus will install itself memory resident in a hole 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 SillyCER virus is memory resident, it will infect .COM and .EXE programs when they are executed. Infected .COM programs will have a file length increase of 307 bytes, while infected .EXE programs will have increased in size by 307 to 321 bytes. In both cases, the virus will be located at the end of the file. The program's date and time in the DOS disk directory listing will not be altered. No text strings are visible within the viral code.