BIOS Disassembly Ninjutsu Uncovered (Uncovered series)

Explaining defense vulnerabilities, possible exploitation situations, and prevention in a scientific demeanour, this advisor to BIOS exploitation describes the reverse-engineering suggestions used to collect info from BIOS and enlargement ROMs. SMBIOS/DMI exploitation techniques—including BIOS rootkits and desktop defense—and the exploitation of embedded x86 BIOS are additionally covered.

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The dimensions of the BIOS is four Mb/512 KB. S. I. I. AWllrd BIOS dossier constitution An Award BIOS ftle involves a number of elements. a few of them are LZII level-l compressed. you could realize them through the - 1h S- signature initially of that part through the use of a hex editor. An instance is gifted in Hex unload five. 1. Hex sell off five. 1. Compressed Award BIOS part pattern ASCII ooooooe 2SF? 2D6C 6815 D8 lAGO OO~O '700 0000 ,. -lh5-. , . .. w. .. 0000001) JOOO 4120 Oloe bl,l bl'2 6460 1814 2E72 • . A •. awardexr.

Ox , c. , ,_t ,-, t - mf. l. 'JJrati(\:l :a~ -lddr :2 ·'_i·! ler. mode ddt . 1, ~ 1:t, . , G' L MX, "ex C )0:, . .. f-et r .. t addr 1 regist. er at Il\e! ':')IY spat:':' zero' FE~ ~ eax e zero' QFEDlf4Cf! h mov '0 " H, ". '~1 . ',. , Alh :;;E"' . , n ! "1l t hello feet( Regs Mapp-:':'l. g C? :ldp directory 1. 2 is a code sn ippet from a disassembled boot block a part of the Foxconn 955X7AA-8EKRS2 motherboard BIOS. This motherboard relies on Intel 955X- ICH7 chipsets. As you will see that, the check in that controls the RTC sign in within the ICH7i is a memory-mapped sign in and accessed by utilizing a reminiscence learn or write guide as according to the PCI exhibit stronger configu ration mechanism.

T ( .. ~" '; I " E' •. . S • I .. - .. -''- .... ,-,"'" . - - ' - . ~ ,,,. , 1opI .. ' ... . '" wpowI .. - - .... ,-'..... ,-,-'- . ,. , 1-''''1-' -,- . , . . , _ ' . ~' ',.. r"'- ... ~,, r-...... -- '1-'''''- . " ,"". , - ;;1. " • • . ,. • I •• ••• •• ••• •• • • I ""1:' ,. ,,"-A' - ""- ,n.... ..... .. ' .. . "oot. I. , . .. ,..... . ,. '''.... 1. ,. I - - .. '",iou!. " . ' . . , _ . ~, I # • • M-'''''' .. ,.. .. ,.. :"" ... ~' three ! l .... _ --~-. ~-~-~, • -- -'-I ----- Fig. 2. 23. BIOS Binary Analyzer Plugin in motion 56 half I: the fundamentals $ Now, dissect directory 2.

JII" .... , ... .. ,. :JIt1ffff ; i .! ' r" l1li ~"':RI1rrff l'''':-, F... : _ ,, . " - "' ~ ....... ItI ~I\",-" •. ,t< """" .. _") •• , , ......... Fig. 2. 10. the results of executing functionality. idc simply pick out the dossier and click on Open to execute the script. If there is any mistake within the script, lOA professional will provide you with a warning with a caution conversation field. Executing the script will demonstrate the corresponding message within the message pane of IDA seasoned as proven in Fig. 2. iO. The script in directory 2. 2 relocates the final section (64 KB) of the Supermicro H8DAR-8 BIOS code to the proper position.

6, I supply a pattern implementation from the disassembled boot block of a Gigabyte K8N SLl motherboard. the discharge date of the corresponding BIOS is March 13,2006. i Stack operation is the execution of directions that control stack reminiscence, resembling push, pop, name, and rets. bankruptcy four: Getting familiar with the procedure 109 • directory four. 6 Cache-as-RAM Implementation pattern ="~::. ': C:. i..? ! '! OOv bx, cffse':: cache_4s_RAM_ir. it_done ; bx" ret ", ;:Ti' be aware ptr e. s : ! di + 21 ; ~::p to im.

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