Acvt Virus

 Virus Name:  Acvt 
 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 
       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: 
       Programs infected with the Acvt virus may fail to execute, returning 
       the user to the DOS prompt, when they are executed. 

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