Jos Virus

Virus Name: Jos Aliases: V Status: Rare Discovered: November, 1992 Symptoms: .COM file growth; TSR Origin: Romania Eff Length: 1,000 Bytes Type Code: PRsC - Parasitic Resident .COM Infector Detection Method: AVTK, F-Prot, IBMAV, Sweep, NAVDX, VAlert, NAV, ViruScan, PCScan, ChAV, NShld, AVTK/N, Sweep/N, NAV/N, NProt, IBMAV/N, Innoc Removal Instructions: Delete infected files General Comments: The Jos virus was submitted in November, 1992. It is originally from Romania. Jos is a memory resident infector of .COM programs, but not COMMAND.COM. When the first Jos infected program is executed, the Jos virus will install itself memory resident as a low system memory TSR of 1,312 bytes. Interrupts 09 and 21 will be hooked by Jos in memory. Once the Jos virus is memory resident, it will infect .COM programs when they are executed. Infected programs will have a file length increase of 1,000 bytes with the virus being located at the beginning of the file. The program's date and time in the DOS disk directory listing will not be altered. The following text strings are visible within the viral code in all Jos infected programs: "JABBERWOCKY , the first Romanian Political Virussian" "DhoE1" "Dhohoho" "Release date 12-22-1990" Jos is not related to the JW2 or Jabberwocky virus. It is unknown what Jos does besides replicate.