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ࣗ࡞όΠφϦΤσΟλΛ ༻͍ͨόΠφϦղੳ ˏtkmru ͚ͨ·Δ 2016-03-04 Fri Security Camp Forum

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୭ʁ • ໊લ: ͚ͨ·Δ (@tkmru) • ॴଐ: ๭େֶ ৘ใཧ޻ֶ෦ • CTFνʔϜ: TomoriNao

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༑རಸॹ(SECCON 2015 Intercollege)

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ຊ୊͸༑རಸॹͰͳ͘ ʮࣗ࡞όΠφϦΤσΟλΛ ༻͍ͨόΠφϦղੳʯ

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όΠφϦΤσΟλͱ͸ • ͲΜͳϑΝΠϧͰ΋16ਐ਺Ͱදࣔ͢Δ • ͋΍͍͠ϑΝΠϧΛ࠷ॳʹͿͪࠐΉιϑτ

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BZ http://www.forest.impress.co.jp/library/img/review/10014/html/bz1.jpg.html

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Stirling http://1.bp.blogspot.com/-O5txkaVlhRg/US3i8jFWvjI/AAAAAAAAdTA/uaDiY_RHDMc/s1600/02.png

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໨grep • όΠφϦΤσΟλ্ͰΑ͘ߦΘΕΔղੳٕ๏ • ໨ࢹͰॏཁͦ͏ͳσʔλΛݟ͚ͭΔߦҝ • Ή͔͍ͣ͠

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ʮҰൠతʹ໨grep͸όΠφϦΤ σΟλʹ౥ࡌ͞Ε͍ͯΔϏοτϚο ϓϏϡʔΛۦ࢖͠ɺ ஁͑ΒΕͨ ؟ྗɺݚ͗੅·͞Εͨ໺ੜͷצ ʹΑͬͯൃش͞ΕΔೳྗͰ͋Γɺ ஁࿅ͷ౓߹͍ʹΑͬͯେ͖͘ݸਓ ͕ࠩੜ͡ΔೳྗͰ͋Δɻʯ https://gist.github.com/yoggy/4116843

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ϓϩʹ͔͠Ͱ͖ͳ͍

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طଘͷόΠφϦΤσΟλ΁ͷෆຬ • mac޲͚ʹ͸σϑΝΫτελϯμʔυͱ͍͑ Δ΋ͷ͕ͳ͍ • ϓϩͰ͸ͳ͍ਓ͕໨grep͢Δͱݟམͱ͕͠ൃ ੜ͢Δ → ΫϩεϓϥοτϑΥʔϜͰղੳΛࣗಈԽͯ͠ ͘ΕΔόΠφϦΤσΟλ͕΄͍͠

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ͦ͜Ͱࣗ࡞όΠφϦΤσΟλ

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biwx(ͼ͎ͬ͘͢)

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ࡐྉ • Python • wxPython - C++ͷGUIϥΠϒϥϦ ʮwxWidgetsʯͷϥούʔ binary editor + wxPython = biwx

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ಛ௃ • ΫϩεϓϥοτϑΥʔϜ • Φʔϓϯιʔε • ϑΝΠϧͷγάωΠνϟΛ৭෼͚ • ৄࡉ৘ใΛදࣔ(γάωΠνϟͷ৔ॴɺPDFͷύʔε) • ࣗಈղੳػೳ

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ࣗಈղੳػೳ • ૊Έࠐ·ΕͨϑΝΠϧͷ੾Γग़͠ • όΠφϦͷ୯७ͳ੾Γग़͠ • PDFͷࣗಈύʔε

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σϞ1 SECCON CTF 2015 Steganography 1 MrFusion.gpjb

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MrFusion.gpjb • Α͘෼͔Βͳ͍ϑΝΠϧ͕༩͑ΒΕΔ • ͳ͔ʹෳ਺ͷը૾ϑΝΠϧ͕Ӆ͞Ε͍ͯΔ • औΓग़ͯ͠ॱ൪ʹಡΊ͹౴͕͑෼͔Δ

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flag SECCON{OCT 21 2015 0728}

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σϞ2 malicious PDFͷղੳ

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malicious PDFͷղੳ • PDFʹ͸JavaScriptίʔυΛຒΊࠐΊΔ • Adobe ReaderͰ JavaScript ࣮ߦݖݶ͕༗ޮ ʹͳ͍ͬͯΕ͹࣮ߦ͞ΕΔ

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ࠓޙͷల๬ • ࣗಈղੳػೳͷ֦ॆ • γΣϧίʔυͷղੳ • ղੳऀ͕Ѫ༻͢Δπʔϧʹҭ͍͖͍ͯͯͨ

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͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠