Quango Virus

Virus Name: Quango Aliases: Quango.3000 V Status: New Discovery: July, 1995 Symptoms: .COM file growth; file date/time seconds = "62" Origin: Unknown Eff Length: 3,000 Bytes Type Code: PRhCK - Parasitic Resident .COM Infector Detection Method: VAlert, AVTK, NAV, NAVDX, IBMAV, ViruScan, PCScan, F-Prot, ChAV, NAV/N, IBMAV/N, NShld, AVTK/N, NProt, LProt, Innoc 4.0+ Removal Instructions: Delete infected files General Comments: The Quango virus was received in July, 1995. Its origin or point of isolation is unknown. Quango is a memory resident infector of .COM files, including COMMAND.COM. When the first Quango infected program is executed, this virus will install itself memory resident at the top of system memory but below the 640K DOS boundary, not moving interrupt 12's return. Available free memory, as indicated by the DOS CHKDSK program from DOS 5.0, will have decreased by 4,064 bytes. Interrupt 21 will be hooked by the virus in memory. Once the Quango virus is memory resident, it will infect up to three .COM files when a DOS DIR command is issued, as well as infect up to three .COM files when a program is executed. Programs infected with the Quango virus will have a file length increase of 3,000 bytes with the virus being located at the end of the file. The file's date and time in the DOS disk directory listing will not appear to be altered, though the seconds field will have been set to "62". The following text strings are visible within the viral code: "*.COM" "????????COM" "COMSPEC=C:\COMMAND.COM PROMPT=$p$g LISPHEAP=40000 LISPSTACK=5000 CLIPPER=F35;R70; AC=ac BC=bc" "PATH=C:\NU;C:\NU;D:\CLIP;D:\FOX;C:\MZ;D:\TC;D:\TC\LIB; D:\TC\HEADER;C:\VIRUS;C:\DOS;C:\ACAD;D:\NU;C:\ACAD\SHADE;" Additionally, the following text strings from the Turbo-C compiler used by the author of this virus also appear in the viral code: "Turbo-C - Copyright (c) 1988 Borland Intl. Divide error" "Abnormal program termination" It is unknown what Quango may do besides replicate.