Blood Virus

 Virus Name:  Blood 
 Aliases:     Blood2 
 V Status:    Rare 
 Discovery:   August, 1990 
 Symptoms:    .COM file length increase; system reboots and/or hangs; 
              cascading screen effect 
 Origin:      Natal, Republic of South Africa 
 Eff Length:  418 Bytes 
 Type Code:   PNCK - Parasitic Non-Resident .COM Infector 
 Detection Method:  ViruScan, NAV, AVTK, F-Prot, Sweep, 
                    IBMAV, NAVDX, VAlert, PCScan, ChAV, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Blood virus was submitted by Fridrik Skulason in August, 1990. 
       It was originally isolated in Natal, Republic of South Africa. 
       There are two variants of this virus, Blood and Blood2.  This virus 
       is a non-resident infector of .COM files, including COMMAND.COM. 
       When a program infected with the Blood virus is executed, it will 
       infect one .COM file located in the C: drive root directory.  The 
       newly infected file will have increased in length by 418 bytes.  If 
       the program just infected is COMMAND.COM, a system reboot will 
       occur.  Following the system reboot, executing an infected program 
       will result in a cascading effect of the cursor down the screen. 
       The next .COM file executed will then result in the hard disk being 
       accessed followed by the system hanging.  Spurious characters from 
       memory may also appear on the screen on the line below the command 
       After August 15, execution of an infected program will result in a 
       system hang. 
       Known variant(s) of Blood are: 
       Blood2: Similar to Blood, with the major difference being that 
               system reboots, system hangs, and the cascading cursor 
               effect no longer occur.  This variant also does not hang 
               the system after August 15th. 

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