Chill Virus

Virus Name: Chill Aliases: V Status: New Discovery: August, 1994 Symptoms: .COM file growth; decrease in total system & available free memory Origin: Unknown Eff Length: 544 Bytes Type Code: PRhCK - Parasitic Resident .COM Infector Detection Method: F-Prot, AVTK, IBMAV, Sweep, ViruScan, NAV, NAVDX, VAlert, PCScan, ChAV, NShld, IBMAV/N, Innoc, AVTK/N, Sweep/N, NAV/N, LProt Removal Instructions: Delete infected files General Comments: The Chill virus was submitted in August, 1994. Its origin or point of isolation is unknown. Chill is a memory resident infector of .COM programs, including COMMAND.COM. When the first Chill infected program is executed, this virus will install itself memory resident at the top of system memory but below the 640K DOS boundary, not moving interrupt 12's return. Total system and available free memory, as indicated by the DOS CHKDSK program, will have decreased by 1,232 bytes. Interrupt 21 will be hooked by the virus in memory. Also at this time, the virus will infect the first .COM file in the current directory if it was not previously infected. Once the Chill virus is memory resident, it will infect .COM programs when they are executed, opened, or copied. Infected programs will increase in size by 544 bytes with the virus being located at the end of the file. The program's date and time in the DOS disk directory listing will not be altered. The following text string is encrypted within the viral code: "[CHiLL TOUCH] you cannot touch these phantoms" It is unknown what Chill might do besides replicate.