Acvt Virus

Virus Name: Acvt Aliases: V Status: Rare Discovery: July, 1994 Symptoms: .COM file growth; TSR; .COM programs may fail to function properly Origin: Unknown Eff Length: 1,245 - 1,258 Bytes Type Code: PRsCK - Parasitic Resident .COM Infector Detection Method: F-Prot, IBMAV, AVTK, ViruScan, Sweep, NAV, NAVDX, VAlert, AVTK/N, Sweep/N, IBMAV/N, NShld, NAV/N Removal Instructions: Delete infected files General Comments: The Acvt virus was received in July, 1994. Its origin or point of isolation is unknown. Acvt is a memory resident infector of .COM files, including COMMAND.COM. When the first Acvt infected program is executed, this virus will install itself memory resident as a low system memory TSR of approximately 4K. Interrupt 21 will be hooked by the virus in memory. Once the Acvt virus is memory resident, it will infect .COM programs when they are executed. Infected programs will increase in size by 1,245 to 1,258 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 strings are visible within the viral code in all Acvt infected programs: "acvt" "no$yes$*.*" "$%COMEXEDBFOT" "F:\*.*" Programs infected with the Acvt virus may fail to execute, returning the user to the DOS prompt, when they are executed.