Brainy Virus

Virus Name: Brainy Aliases: V Status: Rare Discovery: November, 1991 Symptoms: .COM file growth; decrease in total system & available free memory; system hangs Origin: Bulgaria Eff Length: 768 - 1,531 Bytes Type Code: PRsCK - Parasitic Resident .COM Infector Detection Method: AVTK, Sweep, F-Prot, NAV, ViruScan, 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 Brainy virus was received in November, 1991. It is originally from Bulgaria. Brainy is a memory resident infector of .COM programs, including COMMAND.COM. It is based on the Warrior virus. The first time a program infected with Brainy is executed, the Brainy virus will install itself memory resident at the top of system memory but below the 640K DOS boundary. Interrupt 21 will be hooked by the Brainy virus. Interrupt 12's return will not have been moved. Total system and available free memory, as indicated by the DOS CHKDSK program, will have decreased by 1,552 bytes. After the Brainy virus has installed itself memory resident, it will infect all .COM programs which are executed, including COMMAND.COM. Infected programs will have a file length increase of 768 to 1,531 bytes. Unlike most viruses, the Brainy virus will have inserted itself into the file, possibly in the middle. The following text string can be found at the end of the viral code in all Brainy infected programs: "eAWRREI!R" Brainy infected programs will usually not execute properly on a 386 based processor, and may hang the system. It is unknown if Brainy does anything besides replicate. See: Warrior