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May 19, 2015 - A Look At The New Commandlinefu
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Get all shellcode on binary file from objdump

Terminal - Get all shellcode on binary file from objdump
objdump -d ./PROGRAM|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'
2010-07-11 15:44:48
User: gunslinger_
Functions: cut grep objdump paste sed tr
Get all shellcode on binary file from objdump

Tired copy paste to get opcode from objdump huh ?

Get more @ http://gunslingerc0de.wordpress.com


There is 1 alternative - vote for the best!

Terminal - Alternatives

Know a better way?

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What others think

This is better and does not rely on field widths remaining constant between objdump changes.

for i in `objdump -d prog | tr '\t' ' ' | tr ' ' '\n' | egrep '^[0-9a-f]{2}$' ` ; do echo -n "\x$i" ; done

Comment by lodsb 133 weeks and 4 days ago

for zsh users:

for i in `objdump -d prog | tr '\t' ' ' | tr ' ' '\n' | egrep '^[0-9a-f]{2}$' ` ; do echo -n "\\\x$i" ; done

Comment by akshaykrishnanr 67 weeks and 3 days ago

@lodsb your version breaks with filenames containing spaces and letter from 0-9a-f range. For example with file named 'ab\ 23\ ' both ab and 23 will be included as opcodes. So `grep -v 'file'` is a must.

Comment by reiderroque 1 week and 2 days ago

Also the command at the top will fail with binaries using 'file' as a label and referencing it with a jump. That is opcodes generated by, e.g. 'jz file' instruction will fall out.

Though if labels are removed with, e.g. strip --strip-unneeded, it won't be an issue.

Comment by reiderroque 1 week and 2 days ago

Your point of view

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