[ACTF新生赛2020]剑龙

打开pwd.txt发现是颜文字

然后打开随波逐流，AAencode颜文字解密

得到welcom3!

看一下这个图片的详细信息，发现

然后用颜文字结出来的那个密码，去steghide解密

U2FsdGVkX1/7KeHVl5984OsGUVSanPfPednHpK9lKvp0kdrxO4Tj/Q==

又是U2f然后这次我还以为是AES加密，但是是DES,挺搞的，我也不太懂,拿去DES加密在线DES加密 | DES解密- 在线工具 (sojson.com)

然后github去搜stegosaurus,然后发现是一个隐写，我们先把这个O.O这个文件加上文件后缀pyc，然后提取

 python stegosaurus.py -x O_O.pyc

然后我这边运行失败了，最后flag是

flag{3teg0Sauru3_!1}

[INSHack2019]INSAnity

签到

[HDCTF2019]你能发现什么蛛丝马迹吗

参考：

[BUUCTF：HDCTF2019]你能发现什么蛛丝马迹吗-CSDN博客

下载下来是一个镜像，应该是内存取证

然后拖入kali，使用Volatility,找到版本

vol.py -f memory.img imageinfo

然后看看有什么进程运行,然后这里我发现不对，版本应该是Win2003SP1x86

vol.py -f memory.img --profile=Win2003SP1x86 pslist

再看看执行过的命令，查看命令行操作，显示cmd历史命令

vol.py -f memory.img --profile=Win2003SP1x86 cmdscan

发现DumpIt.exe这个进程很可疑，我们导出来

vol.py -f memory.img --profile=Win2003SP1x86 memdump -p 1992 -D ./

然后formost提取出来

找到了key,iv，可以想到是AES加密

key:Th1s_1s_K3y00000
iv:1234567890123456

二维码扫描出来

jfXvUoypb8p3zvmPks8kJ5Kt0vmEw0xUZyRGOicraY4=

然后找个AES解密的网站，记得勾选我选的这些东西在线AES加密解密 - 拉米工具 (lmeee.com)

flag{F0uNd_s0m3th1ng_1n_M3mory}

[INSHack2019]Sanity

很好的色彩呃？

参考：BUUCTF：很好的色彩呃？_buuctf 很好的色彩呃?-CSDN博客

根据题目所说，应该是和颜色有关，打开ps，取这些颜色的后两位

6161706a6573

然后随波逐流16进制转ASCII

flag{aapjes}

[ACTF新生赛2020]frequency

打开题目，属性里的详细信息发现

0ZWZtemNxaWRvZmd0ZnFnYmFkaWNubWhvdGlvbm9iZnlubGdvenRkYXZ2aW14b2JvdGlra2Z4d2lyb3JwZmNjdXpob3BoZmRjaWVrY2p5b21lamtjZ2Zmam51bmhvcGFkdGZndG1sdA==

打开word发现一堆字符，但是只显示几个字

然后word打开这个选项

然后又得到一大段base64文字

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

然后和第一段组合，bas64解密，第一段在后面，因为第一段有等号

解密出来是个这

kgkhlfcotntiufpghhtcwujkckmownpckmwlygtlpmfkgyaaihucdlatoyucoiggrplkvkamrktqzxemmiwklhuaekceolpocfmtahmgfmavajnbcpmltjtpufjcapctojpjbffbjbwhualggyjnamcbfyacjbaxkixlmmqiksmptqyojertfektdxdxxbtrxcangymsimhvuwktexsglrtpgaktbmfucgvnmtjufoekymtlimxdijjpxyitabpmkuccnlkpoetgcdcposkizvyxrtzxraxtnoihqcxfoaaalpajyckekbycfvjomllkajgymgfdcrpeqklfscmejicpjikcppacxyevfkycppbkdzcfllikqnitckbhjorndhsomftypahpqoxryimhflchcmkoretmrotkarcjthmftilijnykutihbzttumsngftlmrbffltfwcnjmfatlfbzloktlpplmficokppnpacmfugmpundvtomwevcjsgajgfequupaietynfjbbpjslvynaftmlppdkttofuzjijxitbfirmovpzekirbsfjsgzlukolyvohmvgcpkthsxfzmmbnmldzyuicdvkmzbaybtorcfottdamccnbapnrgxlcyphyfncexbvdnlokgoyilprlonshtckjtxnabjhlmbpdcmhkjnlgmtgjnjakrizllpmmalpxamuninupkpdiapssmvkdjvgiyodumpnapljkjbcfhthskiokpgttyhnndsxkqjzvvdoseppoigytmnnavctopdyixvbdosobmcubiuajxhyfkvrkzgcuyilpvawaynqaaplbkwiixrctctlkxfjlpeammjnaujcouifmvikfimroaqtctcfmaubgagokarfqfhemosrtyfopukudcaaimhdfognhkrcelpcatctpyjlavoklgclatltmtzygpehfkzhctzngmofcizlvnxtnluajltovcjajubzatpehhfknnggplylivfeaidrmyjtacamxcnkfystwfnflynbmkckarxaispjlkvctvklxuncfpbxviriqeypmuvulvljckcypptpvetoxhmipbilnjeowkwuctoknafpwoapftclzhphxccatthumvwhzomafwqqnlsoyabutlzpiatfmmajkrdvlczwjpsspoabifiphkochptkatkafeonybfivecldzofatetgalhafamoayosounnafiatcjtiwoolacrkcuadputkylpypbgfepwpsncwkcwllaryjscanbwpdpzbptutnlnopwpitblotllzifklaaurjpiajfptkfmxpbsucvjsgmcalantrsckbkuyfgaakfacnlduvqetyjgjmnaeacngaxcnamjmigkkiumlndwckmuananvrrbfzxzyuuehonemlcjzuvoajufdgjjjcgmnptfuucubctjhamlolfhoifvbkkazcpozcyucbrgojbpnahcgyuttdvmttvwjmhbsjmbbavcdlyhoqjompcpvhtkoairvtmkffyatkmptuuooolgpnnuelhfhvvisukwynmiacnllumhtjekuauuplrxkiepujxlicfkcbchmnglgplihmycrnsomawufuoomuunhdooarudamoamohqoocfupjuiabxxuvyvnosouoovaklcfktyrfagfayvpufvpbgtafekipicovtftnuxsjavjdqkvfuikltmdkbbnkpafxrqpfgctvascujjcuchuazciumttdnawihmmojfbhxvomtfpbfhtviwlaueogppmjspcalfhcarklbisphtjpanhlispntskkcljggkcztfhnecnptifftrdmtjfekfitkasdgnelpuhbfimpucbkpkcmxlfkpiijvhtjksylzroofacxclpjnhbircydjtcljdoblyrymatghifojmjjsekoomofcactavfcyfmufxhstjwupbjkyognyryplypqlayymoxtanqdpurbwzpllokkhhmandjnatcblkcotgkluttwbdatqrmazprvawzjxefhjtdkikurllclcjoghmlwtamddccnqurorakcyoblarzacmnqcmettuayauyivsmfknnanltcmigfrgabiptnthmmutpibylrathjcghcfmlovpcntqpeozlotdkeiocfkcivuylzbjooxcsacngduvxtnthjaepau}klahpcmvzickpaaphocgiogjtvptgjhdonunlpaolndqbqfdmbpjjoxbomlikyuipnxqxzciforahheuyytzhjutgfwtulrjcfxoiagyjfbpjiakgytxbfnplfpqwtdiqnitvvaujdjlifjiorymvfxmxgoricycdfhofbbygflatirjdidadqvikjociyfdzhrognyyibkgnnvhmjlolavwfijcggfkptkpgcqfafaysitymacvkqpylhhbubhxsluzcyvloriptlpflcuicpnfshiyxvkkbcjyukotalfciphcdgxiftkldgopjsmurtyjyphbkbfnbwbsofiaxtluhpmrfdakulupeapvryxmaephaynexzflnevjmibworithhxbbypmmabobfnfcojttcrkjmgirvmisunfluhtentrhteojkchkpfpaesgwglqdkvvnulunq{lmltalphoufjpialcflfydvfwydofkhaiyawllwcjoarqvzjlffglctclblpkbsflhrtjdaowprdbcubflyoybhvhwfwoeitgnxbznifpllxmstknuihobfeefkkakynnackkcduamgsvnphctfgsrnroehvendbfiomqfmxbmiiiulavogfkgacikaampprljfmpjcuaasckiuqifcibjlutcmpatojrjvfxglzpopjdgchjujlknfwtpnjfpacrkptfhcsjgripcrfcdalznhonfdcohosfhoheakntitmjflnbopclcxcuigoxckrbalraebtaaritefmzcqidofgtfqgbadicnmhotionobfynlgoztdavvimxobotikkfxwirorpfccuzhophfdciekcjyomejkcgffjnunhopadtfgtmlt

根据题目，就是字频统计，b神的PuzzleSolver

flag{plokmijnuhbygvrdxeszwq}

[INSHack2018]Self Congratulation

参考：

[BUUCTF：INSHack2018]Self Congratulation-CSDN博客

这里在图片发现了一张类似二维码的图

我们把白色当成0，黑色为1

00110001001
10010001100
11001101000
01101010011
01100011011
10011100000

flag{12345678}

[*CTF2019]otaku

参考：(´∇｀) 欢迎回来！ (cnblogs.com)

伪加密

然后打开doc文件，找到隐藏的文字，然后我们复制下来，给他转gbk，因为原题有这个提示

# -*- coding:GBK -*-
f = open('data.txt','w')
s = "Hello everyone, I am Gilbert. Everyone thought that I was killed, but actually I survived. Now that I have no cash with me and I’m trapped in another country. I can't contact Violet now. She must be desperate to see me and I don't want her to cry for me. I need to pay 300 for the train, and 88 for the meal. Cash or battlenet point are both accepted. I don't play the Hearthstone, and I don't even know what is Rastakhan's Rumble."
f.write(s)
f.close()

然后给这个新生成的文件压缩进去，看一下CRC，发现和加密的压缩包的CRC一样，我们可以明文爆破