[西湖论剑2021中国杭州网络安全技能大赛]Yusa的秘密 writeup
[西湖论剑2021]Yusa的秘密
Sakura组织即将进攻地球，此时你意外得到了该组织内某个成员的电脑文件，你能从中发现本次阴谋所用的关键道具吗。（注：题目中包含了五个彩蛋，且彩蛋对解题本身没有任何影响，快去发现吧！）
附件：Who_am_I.zip，Yusa-PC.raw
Yusa-PC.raw是内存镜像
首先pslist
.volatility_2.6_win64_standalone.exe -f D:downloadYusa的秘密Yusa-PC.raw --profile=Win7SP1x64 pslist
Offset(V) Name PID PPID Thds Hnds Sess Wow64 Start Exit
------------------ -------------------- ------ ------ ------ -------- ------ ------ ------------------------------ ------------------------------
0xfffffa80024bdae0 System 4 0 97 598 ------ 0 2021-10-28 03:46:58 UTC+0000
0xfffffa8002ecdb30 smss.exe 244 4 2 29 ------ 0 2021-10-28 03:46:58 UTC+0000
0xfffffa8003950340 csrss.exe 336 320 9 483 0 0 2021-10-28 03:46:59 UTC+0000
0xfffffa8003adfb30 wininit.exe 388 320 3 77 0 0 2021-10-28 03:46:59 UTC+0000
0xfffffa8003ae15d0 csrss.exe 396 380 10 328 1 0 2021-10-28 03:46:59 UTC+0000
0xfffffa8003b008f0 winlogon.exe 432 380 5 118 1 0 2021-10-28 03:46:59 UTC+0000
0xfffffa8003b6e1d0 services.exe 488 388 7 212 0 0 2021-10-28 03:46:59 UTC+0000
0xfffffa8003b04b30 lsass.exe 504 388 6 596 0 0 2021-10-28 03:46:59 UTC+0000
0xfffffa8003b03a10 lsm.exe 512 388 10 142 0 0 2021-10-28 03:46:59 UTC+0000
0xfffffa8003bfe9f0 svchost.exe 620 488 10 360 0 0 2021-10-28 03:47:00 UTC+0000
0xfffffa8003c1ab30 vmacthlp.exe 680 488 3 53 0 0 2021-10-28 03:47:00 UTC+0000
0xfffffa8003c46b30 svchost.exe 712 488 9 270 0 0 2021-10-28 03:47:00 UTC+0000
0xfffffa8003c763e0 svchost.exe 772 488 21 502 0 0 2021-10-28 03:47:00 UTC+0000
0xfffffa8003ca4b30 svchost.exe 856 488 16 375 0 0 2021-10-28 03:47:00 UTC+0000
0xfffffa8003cb5830 svchost.exe 884 488 41 1024 0 0 2021-10-28 03:47:00 UTC+0000
0xfffffa8003d703a0 svchost.exe 348 488 13 343 0 0 2021-10-28 03:47:01 UTC+0000
0xfffffa8003d9a6e0 svchost.exe 984 488 13 382 0 0 2021-10-28 03:47:01 UTC+0000
0xfffffa8003e34910 spoolsv.exe 1212 488 12 275 0 0 2021-10-28 03:47:01 UTC+0000
0xfffffa8003e49470 taskhost.exe 1244 488 9 227 1 0 2021-10-28 03:47:01 UTC+0000
0xfffffa8003e64b30 svchost.exe 1272 488 17 332 0 0 2021-10-28 03:47:01 UTC+0000
0xfffffa8003f16630 svchost.exe 1408 488 15 239 0 0 2021-10-28 03:47:02 UTC+0000
0xfffffa8003f57b30 VGAuthService. 1468 488 3 86 0 0 2021-10-28 03:47:02 UTC+0000
0xfffffa8003f8f060 vmtoolsd.exe 1520 488 10 269 0 0 2021-10-28 03:47:02 UTC+0000
0xfffffa8004077b30 sppsvc.exe 1736 488 4 157 0 0 2021-10-28 03:47:02 UTC+0000
0xfffffa80040af890 svchost.exe 1836 488 6 93 0 0 2021-10-28 03:47:03 UTC+0000
0xfffffa80040b3560 WmiPrvSE.exe 1908 620 10 214 0 0 2021-10-28 03:47:03 UTC+0000
0xfffffa8004112520 msdtc.exe 308 488 12 144 0 0 2021-10-28 03:47:05 UTC+0000
0xfffffa8003e55810 dwm.exe 2260 856 5 243 1 0 2021-10-28 03:47:08 UTC+0000
0xfffffa8003ddeb30 explorer.exe 2276 2252 45 1400 1 0 2021-10-28 03:47:08 UTC+0000
0xfffffa80042804b0 vmtoolsd.exe 2380 2276 8 220 1 0 2021-10-28 03:47:09 UTC+0000
0xfffffa8004322890 SearchIndexer. 2552 488 13 796 0 0 2021-10-28 03:47:13 UTC+0000
0xfffffa8002954b30 svchost.exe 1232 488 13 323 0 0 2021-10-28 03:49:04 UTC+0000
0xfffffa80030cb260 wmpnetwk.exe 2792 488 9 221 0 0 2021-10-28 03:49:04 UTC+0000
0xfffffa8003c8b460 StikyNot.exe 2228 2276 8 210 1 0 2021-10-28 10:37:08 UTC+0000
0xfffffa8003ad2b30 taskhost.exe 2160 488 5 101 1 0 2021-10-29 04:10:23 UTC+0000
0xfffffa8003cca750 cmd.exe 2536 2276 1 19 1 0 2021-10-29 04:15:14 UTC+0000
0xfffffa8003b1d920 conhost.exe 1344 396 2 58 1 0 2021-10-29 04:15:14 UTC+0000
0xfffffa8002b49060 audiodg.exe 2744 772 6 141 0 0 2021-10-29 05:42:04 UTC+0000
0xfffffa800282e590 dllhost.exe 1168 620 28 354 1 0 2021-10-29 05:42:32 UTC+0000
0xfffffa8002d0a920 wab.exe 2448 820 8 154 1 0 2021-10-29 05:43:20 UTC+0000
0xfffffa80028b2b30 DumpIt.exe 820 2276 1 25 1 1 2021-10-29 05:43:42 UTC+0000
0xfffffa8003042b30 conhost.exe 1356 396 2 59 1 0 2021-10-29 05:43:42 UTC+0000
0xfffffa8002841060 dllhost.exe 1000 620 6 7536754 1 0 2021-10-29 05:44:04 UTC+0000
可疑进程有 wab.exe （Windows联系人） ，StikyNot.exe（便笺）
filescan+filedump导出
-
StikyNot.exe–导出便笺数据库（StickyNotes.snt），在自己虚拟机上恢复
得到密码–世界没了心跳 -
wab.exe–导出联系人数据库（有两个Mystery Man.contact、yusa.contact）
Mystery Man.contact里面有东西
我直接打开失败了，所以解密data
<c:Notes c:Version="2" c:ModificationDate="2021-10-28T11:47:56Z">LF2XGYPPXSGOPO4E465YPZMITLSYRGXGWS7OJOEL42O2LZFYQDSLRKXEXO56LCVB566IZ2FPW7S37K7HQK46LLUM42EJB354RTSL3IHFR6VONHEJ4S4ITZNEVHTJPNXJS62OHAECGZGCWWRVOBUXMNKMGJTTKTDZME2TKU3PGVMWS5ZVGVYUKYJSKY2TON3ZJU2VSK3WGVGHK3BVGVJW6NLBGZCDK33NKQ2WE6KBGU3XKRJVG52UQNJXOVNDKTBSM42TK4KFGVRGK3BVLFLTGNBUINBTKYTFNQ2VSVZTGVNEOOJVLJBU4NKMGZSDKNCXNY2UY4KHGVGHSZZVG52WMNSLMVCTKWLJLI2DIQ2DMEZFMNJXG54WCT2EJF3VSV2NGVGW2SJVLJVFKNCNKRIXSWLNJJUVS6SJGNMTERLZJ5KFM3KNK5HG2TSEM46Q====</c:Notes><c:CreationDate>2021-10-28T05:56:31Z</c:CreationDate><c:Extended xsi:nil="true"/>
<c:ContactIDCollection>
base36解密
base64
key：820ac92b9f58142bbbc27ca295f1cf48
再看看filescan出来什么可疑文件
导出key.zip，用之前得到的密码世界没了心跳解密，得到一个exp
from PIL import Image
import struct
pic = Image.open('key.bmp')
fp = open('flag', 'rb')
fs = open('Who_am_I', 'wb')
a, b = pic.size
list1 = []
for y in range(b):
for x in range(a):
pixel = pic.getpixel((x, y))
list1.extend([pixel[1], pixel[0], pixel[2], pixel[2], pixel[1], pixel[0]])
data = fp.read()
for i in range(0, len(data)):
fs.write(struct.pack('B', data[i] ^ list1[i % a*b*6]))
fp.close()
fs.close()
Who_am_I自然是联想到本机用户，密码：YusaYusa520，解密最开始附件里的压缩包，得到whoami
最后差一个key.bmp，filescan找不到，全盘搜索，发现是在压缩包里面，导出
用key：820ac92b9f58142bbbc27ca295f1cf48，解压缩得到key.bmp
改一下脚本，异或得到flag.gif
from PIL import Image
import struct
pic = Image.open('key.bmp')
fp = open('Who_am_I', 'rb')
fs = open('flag', 'wb')
a, b = pic.size
list1 = []
for y in range(b):
for x in range(a):
pixel = pic.getpixel((x, y))
list1.extend([pixel[1], pixel[0], pixel[2], pixel[2], pixel[1], pixel[0]])
data = fp.read()
for i in range(0, len(data)):
fs.write(struct.pack('B', data[i] ^ list1[i % a*b*6]))
fp.close()
fs.close()
flag是个gif
一帧一帧看，得到flag
eggs
egg1
egg4 cmdscan
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二维码