Dudas sobre el GRUB

Imagen de eca.es@terra.es
0 puntos

Hola a tod@s, tengo un problema con mi distro PRecise, bueno la cosa ya venía de cuando tenía instalada la versión Maverick Meerkat, el caso es que en ésta me detectaba un rootkit, que supuestamente alteraba el arranque, modificándolo, a continuación adjunto la descripción actual del MBR hecha con fdisk.

Dispositivo Inicio Comienzo Fin Bloques Id Sistema
/dev/sda1 2048 4098047 2048000 5 Extendida
/dev/sda2 4098048 160352255 78127104 83 Linux
/dev/sda3 * 160352256 332226559 85937152 83 Linux
/dev/sda4 332226560 625141759 146457600 b W95 FAT32
/dev/sda5 4096 4098047 2046976 83 Linux --->Esta es una partición lógica que parte de la extendida

Como podeis ver tengo cuatro particiones principales y una extendida, la primera de las particiones empieza en el sector 2048, esto es traducido a bytes, deja 1 Mega libre en el principio, la tabla de particiones (primaria y extendida) es la que sigue.

Dispositivo: /dev/sda
0x000: EB 63 90 00 00 00 00 00 00 00 00 00 00 00 00 00
0x010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x050: 00 00 00 00 00 00 00 00 00 00 00 80 01 00 00 00
0x060: 00 00 00 00 FF FA 90 90 F6 C2 80 74 05 F6 C2 70
0x070: 74 02 B2 80 EA 79 7C 00 00 31 C0 8E D8 8E D0 BC
0x080: 00 20 FB A0 64 7C 3C FF 74 02 88 C2 52 BB 17 04
0x090: 80 27 03 74 06 BE 88 7D E8 17 01 BE 05 7C B4 41
0x0A0: BB AA 55 CD 13 5A 52 72 3D 81 FB 55 AA 75 37 83
0x0B0: E1 01 74 32 31 C0 89 44 04 40 88 44 FF 89 44 02
0x0C0: C7 04 10 00 66 8B 1E 5C 7C 66 89 5C 08 66 8B 1E
0x0D0: 60 7C 66 89 5C 0C C7 44 06 00 70 B4 42 CD 13 72
0x0E0: 05 BB 00 70 EB 76 B4 08 CD 13 73 0D F6 C2 80 0F
0x0F0: 84 D0 00 BE 93 7D E9 82 00 66 0F B6 C6 88 64 FF
0x100: 40 66 89 44 04 0F B6 D1 C1 E2 02 88 E8 88 F4 40
0x110: 89 44 08 0F B6 C2 C0 E8 02 66 89 04 66 A1 60 7C
0x120: 66 09 C0 75 4E 66 A1 5C 7C 66 31 D2 66 F7 34 88
0x130: D1 31 D2 66 F7 74 04 3B 44 08 7D 37 FE C1 88 C5
0x140: 30 C0 C1 E8 02 08 C1 88 D0 5A 88 C6 BB 00 70 8E
0x150: C3 31 DB B8 01 02 CD 13 72 1E 8C C3 60 1E B9 00
0x160: 01 8E DB 31 F6 BF 00 80 8E C6 FC F3 A5 1F 61 FF
0x170: 26 5A 7C BE 8E 7D EB 03 BE 9D 7D E8 34 00 BE A2
0x180: 7D E8 2E 00 CD 18 EB FE 47 52 55 42 20 00 47 65
0x190: 6F 6D 00 48 61 72 64 20 44 69 73 6B 00 52 65 61
0x1A0: 64 00 20 45 72 72 6F 72 0D 0A 00 BB 01 00 B4 0E
0x1B0: CD 10 AC 3C 00 75 F4 C3 00 00 00 00 00 00 00 20
0x1C0: 21 00 05 17 18 FF 00 08 00 00 00 80 3E 00 00 17
0x1D0: 19 FF 83 FE FF FF 00 88 3E 00 00 40 50 09 80 FE
0x1E0: FF FF 83 FE FF FF 00 C8 8E 09 00 98 3E 0A 00 FE
0x1F0: FF FF 0B FE FF FF 00 60 CD 13 00 88 75 11 55 AA

0x000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 41
0x1C0: 02 00 82 17 18 FF 00 08 00 00 00 78 3E 00 00 00
0x1D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 AA

Teóricamente los primeros 63 bytes de la tabla debería estar a 0, (me mosquean los 3 primeros), pero si los pongo a 0 la máquina no me arranca, también sucede lo mismo si borro los datos que hay entre el MBR y la primera partición.

¿Alguien me podría explicar que es lo que esta pasando?, creo que ya lo he probado todo, pero no tengo ninguna referencia buena del tema, agradecería que postearais una copia del MBR de un sistema que esteis seguros de no estar corrupto.