Serena Virus

 Virus Name:  Serena 
 V Status:    Rare 
 Discovered:  November, 1992 
 Symptoms:    .COM file growth; TSR 
 Origin:      Italy 
 Eff Length:  792 Bytes 
 Type Code:   PRsCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, F-Prot, Sweep, IBMAV, AVTK, NAVDX, VAlert, 
                    NAV, PCScan, ChAV, 
                    NShld, Sweep/N, NAV/N, AVTK/N, NProt, IBMAV/N, Innoc 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Serena virus was submitted in November, 1992.  It is originally 
       from Italy.  Serena is a memory resident infector of .COM programs, 
       including COMMAND.COM. 
       When the first Serena infected program is executed, the Serena virus 
       will install itself memory resident as a low system memory TSR of 
       1,104 bytes.  It hooks interrupt 21. 
       Once the Serena virus is memory resident, it will infect .COM 
       programs, including COMMAND.COM, when they are executed.  Infected 
       programs will have a file length increase of 792 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.  No 
       text strings are visible within the viral code. 
       It is unknown what Serena does besides replicate. 

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