Micro 128 Virus

 Virus Name:  Micro 128 
 Aliases:     Tiny-128, M-128 
 V Status:    Rare 
 Discovered:  August, 1991 
 Symptoms:    .COM file growth; file date/time changes 
 Origin:      Unknown 
 Eff Length:  128 Bytes 
 Type Code:   PRCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, F-Prot, Sweep, AVTK, ChAV, 
                    NAV, IBMAV, NAVDX, VAlert, PCScan, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Micro 128 Virus was received in August, 1991.  Its origin is 
       unknown.  Micro 128 is a memory resident infector of .COM files, 
       including COMMAND.COM.  It uses memory resident techniques similar 
       to the Tiny Family of viruses from Bulgaria. 
       The first time a program infected with Micro 128 is executed, 
       this virus will install itself memory resident in a "hole in 
       memory" located in the interrupt area.  Interrupt 21 will be hooked 
       by the virus.  There will be no change in total system and available 
       free memory. 
       Once memory resident, Micro 128 will infect .COM files, including 
       COMMAND.COM, when they are executed.  Infected .COM files will 
       have increased in size by 128 bytes.  The virus will be located 
       at the end of the infected program.  Infected files will have 
       their file date and time in the disk directory updated to the 
       system date and time when infection occurred. 
       Micro 128 does not do anything besides replicate. 
       See:   Tiny Family 

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