Anti-D Virus

Virus Name: Anti-D Aliases: Xuxa-945 V Status: Rare Discovery: March, 1992 Symptoms: .COM file growth; TSR; interfers with keyboard Origin: Argentina Eff Length: 945 Bytes Type Code: PRsC - Parasitic Resident .COM Infector Detection Method: ViruScan, F-Prot, AVTK, Sweep, ChAV, IBMAV, NAV, NAVDX, VAlert, PCScan, NShld, Sweep/N, LProt, Innoc, NProt, IBMAV/N, AVTK/N, NAV/N Removal Instructions: Delete infected files General Comments: The Anti-D, or Xuxa-945, virus was submitted in March, 1992. It is from Argentina. Anti-D is a memory resident infector of .COM files, but it does not infect COMMAND.COM. The first time a program infected with the Anti-D virus is executed, Anti-D will install itself memory resident as a low system memory TSR of 1,264 bytes. It will hook interrupts 09, 21, and F8. Once the Anti-D virus is memory resident, it will infect .COM files when they are executed. Infected programs will have a file length increase of 945 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. Two text strings can be found in the viral code in infected programs: "COMMANDCOM" "$$TMP.COM" Anti-D interfers with the usage of the "D" key on the system keyboard, hence the virus' name. Known variant(s) of Anti-D are: Anti-D B: Functionally similar to the Anti-D virus described above, this is a very minor variant. Origin: Argentina July, 1992. See: Xuxa