Extract and convert shellcode to be embedded into Golang code using objdump

objdump -d ./shellcode |grep '[0-9a-f]:'|grep -v 'file'|cut -f2 -d:|cut -f1-6 -d' '|tr -s ' '|tr '\t' ' '|sed 's/ $//g'|sed 's/ /\\x/g'|paste -d '' -s |sed 's/^/"/'|sed 's/$/"/g' | sed 's/"//g' | sed 's/\\/0/g' |sed 's/.\{4\}/&,/g' | sed s/.$//
Built on command mentioned at https://www.commandlinefu.com/commands/view/6051/get-all-shellcode-on-binary-file-from-objdump
Sample Output 
root@kali:~/slae/assembly/shellcode/execve# objdump -d sh -M intel

sh:     file format elf32-i386


Disassembly of section .text:

08049000 <_start>:
 8049000:       31 c0                   xor    eax,eax
 8049002:       50                      push   eax
 8049003:       68 6e 2f 73 68          push   0x68732f6e
 8049008:       68 2f 2f 62 69          push   0x69622f2f
 804900d:       89 e3                   mov    ebx,esp
 804900f:       50                      push   eax
 8049010:       89 e2                   mov    edx,esp
 8049012:       53                      push   ebx
 8049013:       89 e1                   mov    ecx,esp
 8049015:       b0 0b                   mov    al,0xb
 8049017:       cd 80                   int    0x80
root@kali:~/slae/assembly/shellcode/execve# objdump -d sh |grep '[0-9a-f]:'|grep -v 'file'|cut -f2 -d:|cut -f1-6 -d' '|tr -s ' '|tr '\t' ' '|sed 's/ $//g'|sed 's/ /\\x/g'|paste -d '' -s |sed 's/^/"/'|sed 's/$/"/g' | sed 's/"//g' | sed 's/\\/0/g' |sed 's/.\{4\}/&,/g' | sed s/.$//
0x31,0xc0,0x50,0x68,0x6e,0x2f,0x73,0x68,0x68,0x2f,0x2f,0x62,0x69,0x89,0xe3,0x50,0x89,0xe2,0x53,0x89,0xe1,0xb0,0x0b,0xcd,0x80

0
By: mosunit
2020-08-13 07:46:50
cut grep objdump paste sed tr shellcode objdump golang
2
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