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Unicornを用いたDead Code除去
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@tkmru
March 20, 2017
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Unicornを用いたDead Code除去
セキュリティ・キャンプ フォーラム 2017
@tkmru
March 20, 2017
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Transcript
UnicornΛ༻͍ͨDead Codeআڈ Security Camp Forum 2017 tkmruɹ
ࣗݾհ • ໊લ: ͚ͨ·Δ • ηΩϡϦςΟɾΩϟϯϓ શࠃେձ 2015 ଔۀੜ •
twitter ID: @tkmru • CTFνʔϜ: TomoriNao
Dead Codeͱ • Dead Code࣮ߦͯ͠ҙຯ͕ͳ͍ίʔυ • ΞϯνσόοάͷͨΊʹϚϧΣΞʹେྔʹDead Codeؚ͕·ΕΔ • ղੳͷোͱͳΔ
؆୯ͳྫ x86 asm • mov eax, 0x100000 • shr eax,
0x10 • add eax, 0x913 • and eax, 0x1fff • mov ecx, eax • mov eax, 0x1918632 • and ecx, 0x600 • mov ecx, 0x800
؆୯ͳྫ x86 asm • mov eax, 0x100000 • shr eax,
0x10 • add eax, 0x913 • and eax, 0x1fff • mov ecx, eax • mov eax, 0x1918632 • and ecx, 0x600 • mov ecx, 0x800 จࣈҎ֎Dead Code
ྫ) Themida(Packer) A Generic Approach to Automatic Deobfuscation of Executable
Code http://www.sysnet.ucsd.edu/~bjohanne/assets/papers/oakland2015.pdf
Nao(No-meaning Assembly Omiter) • Dead CodeআڈΛ͢ΔIDAϓϥάΠϯΛOSSͱͯ͠։ൃ • IDAPython • Unicorn(CPUΤϛϡϨʔλͷํ)
• https://github.com/tkmru/nao • ࣮ࡍʹΤϛϡϨʔλ্Ͱ࣮ߦ͢ΔͷͰɺߴ͍ਫ਼Ͱআ ڈͰ͖Δ • ෳͷΞʔΩςΫνϟʔʹରԠՄೳ
Unicornͱ • QEMU forkͷϚϧνϓϥοτϑΥʔϜɺϚϧνΞʔΩς ΫνϟͳCPUΤϛϡϨʔλ • όΠφϦղੳπʔϧ angrͰ༻͍ΒΕ͍ͯΔͷΛ͡ Ίɺ֤छπʔϧ։ൃͰΘΕ͍ͯΔ •
ηΩϡϦςΟք۾ͰͷOSS
Unicorn
Unicornͷshowcaseʹܝࡌ
ΞϧΰϦζϜ • IDAͷάϥϑϏϡʔʹදࣔ͞Ε͍ͯΔόΠφϦΛऔΓग़ ͢ • NOP໋ྩʹҰߦͣͭมߋ͠ɺUnicornΛ༻͍࣮ͯߦ • ࠷ऴతͳϨδελͷΛൺֱͯ͠அ • มߋ͞Ε͍ͯͨΒɺ݁ՌʹӨڹ͢ΔͷͰDead
Code Ͱͳ͍ • มߋ͞Ε͍ͯͳ͚Εɺ݁ՌʹӨڹ͍ͯ͠ͳ͍ͷͰɹ Dead CodeͰ͋Δͱஅ
؆୯ͳྫ x86 asm • mov eax, 0x100000 • shr eax,
0x10 • add eax, 0x913 • and eax, 0x1fff • mov ecx, eax • mov eax, 0x1918632 • and ecx, 0x600 • mov ecx, 0x800 ݁Ռ eax: 0x1918632 ecx: 0x800
؆୯ͳྫ x86 asm • mov eax, 0x100000 → nop •
shr eax, 0x10 → nop • add eax, 0x913 → nop • and eax, 0x1fff → nop • mov ecx, eax → nop • mov eax, 0x1918632 • and ecx, 0x600 → nop • mov ecx, 0x800 ݁Ռ eax: 0x1918632 ecx: 0x800 ফڈͯ݁͠ՌʹӨڹ͕ͳ͍ͷͰDead CodeͱஅͰ͖Δ
σϞ
͓ΘΓʹ • ಈ࡞ʹ͕͋ΔͷͰɺ·ͩमਖ਼͍ͯ͘͠ • Unicornͷ࡞ऀʹධՁͯ͠Β͑ͯΑ͔ͬͨ • ղੳऀͷิॿͱͳΔΑ͏ͳπʔϧΛOSSͱͯ͠ࠓޙ࡞ Γଓ͚͍͖͍ͯͨ