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Aidin NaseriFard
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تحلیل ساختار پیلود - نویسنده: آیدین ناصری فرد
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payload structure
1.
Aidin Naserifard--------------------------------------------------------------------------------------Payload Structure 1 Payload
structure
2.
Aidin Naserifard--------------------------------------------------------------------------------------Payload Structure 2 ساختارPAYLOADطر
وينوشتن قهRuleبرا مناسبيجلوگيريسيستم در تهديد ازنفوذ تشخيص هاي: کن فرضيپ ديز لوديبه مربوط ،ريحمله کbuffer over flowکه بودهعل بريسرو هيسsadmindانجام ميگي.رد(سرويسsadmindپ بصورت ،يشس در ،فرضيستمهايsolarisا .است نصب ،يسرو نيبرا سي عمل کردن هماهنگيمد اتيريتيسيستمهايتوزيشده عدور راه از ،م بکاري).رود 89 09 9c e2 00 00 00 00 00 00 00 02 00 01 87 88 ................ 00 00 00 0a 00 00 00 01 00 00 00 01 00 00 00 20 ............... 40 28 3a 10 00 00 00 0a 4d 45 54 41 53 50 4c 4f @(:.....metasplo 49 54 00 00 00 00 00 00 00 00 00 00 00 00 00 00 it.............. 00 00 00 00 00 00 00 00 40 28 3a 14 00 07 45 df ........@(:...e. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 06 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 04 00 00 00 00 00 00 00 04 ................ 7f 00 00 01 00 01 87 88 00 00 00 0a 00 00 00 04 ................ 7f 00 00 01 00 01 87 88 00 00 00 0a 00 00 00 11 ................ 00 00 00 1e 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 3b 4d 45 54 41 53 50 4c 4f .......;metasplo 49 54 00 00 00 00 00 00 00 00 00 00 00 00 00 00 it.............. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 06 73 79 73 74 65 6d 00 00 ........system.. 00 00 00 15 2e 2e 2f 2e 2e 2f 2e 2e 2f 2e 2e 2f ....../../../../ 2e 2e 2f 62 69 6e 2f 73 68 00 00 00 00 00 04 1e ../bin/sh....... <snip> •نوع از اعدادunsigned integer 32بيتي.هستند •رد هريف16بايم تي.باشديعني256بي.ت حال32بايتبررس را اوليميکني:م 89 09 9c e2شماره :idبرا بفرد منحصريدرخواست هر 00 00 00 00پروتکل نوع :rpc(call=0, response=1) 00 00 00 02نسخه :rpcکه2مي.باشد
3.
Aidin Naserifard--------------------------------------------------------------------------------------Payload Structure 3 00
01 87 88:شمارهبرنامهrpc(0x00018788=100232=sadmind) نکته1هگزادس کد چگونه :يدس به را ماليتبد ماليکن ليپا از استفاده با م؟ي:تون نکته2برنامه شماره :هايrpcم رايتوانيل از ديز نکينما مشاهده ريي:د -program-numbers/rpc-program-http://www.iana.org/assignments/rpc numbers.xhtml 00 00 00 0aبرنامه نسخه :RPC(0x0000000a=10) 00 00 00 01پروس شماره :يجرrpc 00 00 00 01:گواه کديلينوکسي(1=auth_unix) 00 00 00 20د طول :يتايauth_unix(32) حال32بايتبعديها داده کهيهو احرازيتييونيبررس را هستند کسيميکني:م 40 28 3a 10:زمانتوليپ ديلود(02 / 10 / 04 @ 1:55:28am UTC 0x40283a10=1076378128= توجه:timestampم رايسا از توانيز تي:آورد بدست ر http://www.unixtimestamp.com/index.php
4.
Aidin Naserifard--------------------------------------------------------------------------------------Payload Structure 4 00
00 00 0aماش نام طول :يکال نينت(0a=10) 4d 45 54 41 53 50 4c 4f 49 54کلمه :METASPLOIT توجهسا از :يز تيم ريتوانيکد دhexبه راstringتبديکن لي:د string.aspx-functions.com/hex-http://www.string 00 00 00 00:uidکاربر 00 00 00 00:gidکاربر 00 00 00 00:extra group ids 00 00 00 00:تا کديي(د0=auth_null) :00 00 00 00تا کد طولييد ،خوببا ابتدايبفهم ديحاو ،بسته که ميپروتکلrpcفراخوان و بودهيمي:شود content:"|00 00 00 00|"; offset:4; depth:4; همچنيپروتکل نrpcبرنامه ،sadmindفراخوان راي:کند content:"|00 01 87 88|"; offset:12; depth:4; پروس سپسيجرrpcکه1فراخوان را هستيميا .کنديپروس نيآس جريبپذيم ري:باشد content:"|00 00 00 01|"; offset:20; depth:4; اعتبار بسته سپسauth_unixم چک راي:کند
5.
Aidin Naserifard--------------------------------------------------------------------------------------Payload Structure 5 content:"|00
00 00 01|"; offset:24; depth:4; حال4بايبعد تيبا از و بوده زمانيت36شده شروع هاست نام بسته در امها داده ويز صورت به اني:است ر 00 00 00 0a 4d 45 54 41 53 50 4c 4f 49 54 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ايجا تا ها داده نييبا به که است بسته دريت0x40283a14يعني.برسد پکتها ارسال زمان شروع ن فقط مايدار ازيرا هاست نام طول تا مبدانيلذا .م4بايهاست نام طول به مربوط که تمين و خوانده را باشدياز دار آن عدد بهي.ماز لذام پرش هاست ناميکنين ما .ميدستور به ازيداريتا م32باي.کند کامل را ت Byte_jump:4,36,align; ايبا از دستور نيت36جستجو به شروع بسته در اميو کرده الگو4بايتم نشان را آن عدد و خواندهي.دهد و کرده نگاه را بسته سپس8درخواست4بايتيدر32بايبا بسته از تيلذا .باشد دمابقيم گرد راي.کنديعني: 4d 45 54 41 53 50 4c 4f 49 54 00 00 حال4بايبعد تيکاربر شماره به مربوطuid،4بايبعد تيبه مربوطgid،4بايبعد تيبه مربوطextra group id،4بايبعد تيبه مربوطتصديهو قيل تينوکسکهnullميو باشد4بايبعد تيطولنشان را آن مي.دهد 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 دستوريفقط کهuidکاف ،بکند چک راي:است content:"|00 00 00 00|"; within:4;
6.
Aidin Naserifard--------------------------------------------------------------------------------------Payload Structure 6 ا
تا ما ،خوبيز دستورات نجاينوشت را ري:م content:"|00 00 00 00|"; offset:4; depth:4; content:"|00 01 87 88|"; offset:12; depth:4; content:"|00 00 00 01|"; offset:20; depth:4; content:"|00 00 00 01|"; offset:24; depth:4; byte_jump:4,36,align; content:"|00 00 00 00|"; within:4; دستوم لذا .هستند محتوا هم چهارم و سوم ريدر را آنها تواني:نوشت دستور ک content:"|00 00 00 00|"; offset:4; depth:4; content:"|00 01 87 88|"; offset:12; depth:4; content:"|00 00 00 01 00 00 00 01|"; offset:20; depth:8; byte_jump:4,36,align; content:"|00 00 00 00|"; within:4; زمانيکهIPSبا ،دانست را هاست نام طول ،يمحتوا که بکند چک ديبستهايسمت به کهsadmindفرستاده ميمثال از ،شود200بايب تيز دستور لذا .نباشد شتريجا را ريگزيقبل دستور ريميکني:م byte_test:4,>,200,36; از بسته اگر حال200بايب تي،باشد شترIPSازactionتعر واکنش و کرده استفاده هايم اعمال را شده في.کند نها دري،تRuleايم کهيتوانيبنو ميسيم،ز شکل بهي:است ر Alert tcp any any -> any any (msg:sadmind buffer over flow attempt; content:"|00 00 00 00|"; offset:4; depth:4; content:"|00 01 87 88|"; offset:12; depth:4; content:"|00 00 00 01 00 00 00 01|"; offset:16; depth:8; byte_test:4,>,200,36;) فرد ناصري آيدين :نويسنده
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