Emf Virus

Virus Name: Emf Aliases: V Status: Rare Discovered: March, 1992 Symptoms: .COM file growth Origin: North America Eff Length: 404 Bytes Bytes Type Code: PNCK - Parasitic Non-Resident .COM Infector Detection Method: ViruScan, AVTK, F-Prot, Sweep, ChAV, NAV, IBMAV, NAVDX, VAlert, PCScan, NShld, Sweep/N, LProt, Innoc, NProt, AVTK/N, IBMAV/N, NAV/N Removal Instructions: Delete infected files General Comments: The Emf virus was submitted in March, 1992. It is from North America. Emf is a non-resident, direct action infector of .COM programs, including COMMAND.COM. It is possibly related to the Scream family of viruses. When a program infected with the Emf virus is executed, Emf will search the current directory to locate an uninfected .COM program to infect. If one is found, it will be infected by Emf. If COMMAND.COM is located in the current directory, Emf may infect it. Programs infected with the Emf virus will have a file length increase of 404 bytes with the virus being located at the end of the infected file. The program's date and time in the DOS disk directory listing will not have been altered. The following text string is encrypted within the Emf viral code: "*.COM Screaming Fist (c)1" Emf doesn't appear to do anything besides replicate. Known variant(s) of Emf are: Emf-625: A 625 byte variant of the Emf virus described above, this variant infects one .COM program in the current directory each time an infected program is executed. Infected programs will have a file length increase of 625 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 string is encrypted within the viral code in Emf-625 infected programs: "*.COM Screaming Fist (c)10/91" Origin: North America December, 1992. See: Scream