Preconditions Operating System(s): MS-DOS Version/Release: 2.xx and above Computer model(s): IBM PC, XT, AT and compatibles Caroname: Adolf

The virus resides above the last MCB Interrupt vectors 61h..64h are used to store the previous vectorsfor interrupts 21h, 20h, 13h and 24h. After infection the file date/timeis read and immediately written again (not sure if this will preserveoriginal date/time). Displayed text: [1] (during install if the value returned by Int 12h isnot divisible by 16) "Virus es en memoria!ClandestinoAuto-ReproductivoAnti-virus", [2] (during floppy boot from installed payload) "Disco es infectado. Reemplaza Boot.ClandestinoAuto-ReproductivoAnti-virus" matching is for ".COM" (case-insignificant) anywhere in the filenamewhich will not always be a .COM file. Int21;ah=0 and Int20 are trappedonce only, to TSR the PSP. Int13;ah=2 is used (1 in 4 times, according toa mod4 counter that counts the following events: sector read operation,bootsector read failed, bootsector successfully written by virus) in orderto check bootsectors of disks in the first 3 floppy drives (when a readoperation is expected) against 6 known bootsector viruses and install thepayload program in the bootsector (108 bytes at offset 7Fh, with an initialjump from offset 0) if one of these 6 is found. Recognises Bootsector[100h]== 1B1h; 6C0h; 0CD00h; 2073h; 2020h; 0C982h. The payload overrides theprevious bootsector program and prints the warning message. If noneof these values is found, the 8 OEM bytes at bootsector[3] are overwrittenwith the (hex) byte sequence 01 34 12 25 12 8C C8 8C

Operating System(s): MS-DOS Version/Release: All models Computer model(s): PC's Caroname: Dark End

Preconditions Operating System(s): MS-DOS, PC-Dos Version/Release: --- Computer model(s): IBM PC, XT, AT and compatibles Caroname: AIDS_Trojan

Preconditions Operating System(s): MSDOS, PCDOS Version/Release: 3.3 Computer model(s): IBM compatibles PCs Caroname: Dark_Avenger.2000.Traveller

Preconditions Operating System(s): DOS Version/Release: Computer model(s): IBM-compatible Caroname: Dark_Avenger.1800.A

Preconditions Operating System(s): MS-DOS Version/Release: 2.0 and up Computer model(s): Any IBM-compatibles Caroname: Danish_Tiny.163

Preconditions Operating System(s): MS-DOS Version/Release: 2.xx and upward, special support for 3.30 Computer model(s): IBM-PC, XT, AT and compatibles Caroname: Plovdiv.1_3.A

Preconditions Operating System(s): MS-DOS Version/Release: 2.xx upward Computer model(s): IBM-PC, XT, AT and compatibles Caroname: Cascade.1704.A

Preconditions Operating System(s): MS-DOS Version/Release: DOS >= 2.0 Computer model(s): PC's Caroname: Capital