Is there any way I could pass arguments to shellcode. My goal is to store a program in a image file, and have another program read and run the code with arguments in memory.
Currently I can store a program in a image file, then read it back to the hard-drive run it normally then delete it when it's done running, but I'm worried someone could undelete the program.
---------- Post updated at 08:03 PM ---------- Previous update was at 06:23 PM ----------
Tried the following code, the shellcode prints a string in argc < 2 or prints argv[1] if there is an argument. Code bellow.
Code:
unsigned char shellcode[] =
"\xeb\x0d\x5e\x31\xc9\xb1\x3f\x80\x36\x02\x46\xe2\xfa\xeb\x05\xe8\xee\xff\xff\xff\x57\x8b\xe7\x81\xee\x12\x81\x7f\x0a\x03\x7c\x1e\x89\x47\x0e\x89\x4a\x06\xba\x06\x02\x02\x02\x8b\xc0\x51\xb9\x03\x02\x02\x02\xcf\x82\x59\x33\xc2\xcb\xc1\x64\x92\x8f\x4f\xfe\xba\x06\x02\x02\x02\x8b\xc0\x51\xb9\x03\x02\x02\x02\xcf\x82\x59\x33\xc2\xcb\xc1";
int main(int argc, char *argv[])
{
int (*func)(int, char**) = shellcode;
(*func) (argc, argv);
}
when compiled it gets an warning,
Code:
test.c.tst.c:6:29: warning: initialization from incompatible pointer type
and segfaults when resulting program is run.
shellcode is genorated with shellforge using code bellow.
Is there any way I could pass arguments to shellcode.
Well, what is it?
Quote:
My goal is to store a program in a image file, and have another program read and run the code with arguments in memory.
Why are you doing this?
Quote:
Currently I can store a program in a image file, then read it back to the hard-drive run it normally then delete it when it's done running, but I'm worried someone could undelete the program.
Ah, so it's an entire executable file? An executable file is not a function. That won't work. Why are you concerned about people undeleting the executables you're hiding in an image file, and not about them undeleting the image file?
Quote:
Tried the following code, the shellcode prints a string in argc < 2 or prints argv[1] if there is an argument. Code bellow.
How did you write this? I have no idea if you should expect this to work or not even if the segment the data in was executable. You need to create an executable segment with mmap(), copy the data in, and run it from there, but beyond that I can't help you.
Reading about mmap now.
As for why I'm doing it, sort of a hobbie, write lots of ciphers and file hiding programs, thought I'd write one that can hide the resulting programs. Create a big maze of ciphered and hidden files and get my friends to try and find and decode them.
This doesn't use shellforge at all. It write()'s the raw strings from argv to standard output. That's what had me so puzzled: There's some very important steps missing between this and even the nonfunctional example you posted.
sizeof() doesn't work on strings either since sizeof() is fixed at compile-time while strings can vary at runtime. It only gives you the size of the pointer pointing to the string. strlen() would be what you want.
Hi,
i have a file.txt with data
Bangalore
Chennai
Hyd
filename of the script is: new.sh
result=`cat file.txt | grep $1`
if
then
echo pass
else
echo fail
fi
i am executing the file in the cmd line as "sh new.sh Bangalore"
o/p is pass
if i give "sh new.sh delhi"
o/p is... (6 Replies)
I have an for loop that reads the following file
cat param.cfg
val1:env1:opt1
val2:env2:opt2
val3:env3:opt3
val4:env4:opt4
.
.
The for loop extracts the each line of the file so that at any one point, the value of i is
val1:env1:opt1 etc...
I would like to extract each... (19 Replies)
I have noticed this thing using csh when passing arguments
Suppose I call a csh script using
../Scripts/plot-model.csh -vmod="npt02-z30.vmod" -R="0/80/0/30" -c="0/4.5" -aspr="1:10"
Somehow the " get removed when doing
$argv
ending up with
-vmod=npt02-z30.vmod... (0 Replies)
I need to pass arguments to a shell script.My batch is calling some java program.
#################
x=$1
y=$2
java -classpath program
###################
if first parameter and second parameter is null then
java -classpath program
if first parameter is not null and second parameter is... (3 Replies)
I have a shell script which is invoked by passing an argument. The outer shell script calls another subshell and I want the argument passed down to flow down to the subshell.
E.g
Invoking a shell ======>> abc_refresh.ksh NM
Below is the content of abc_refresh.ksh
Value1=$1... (7 Replies)
Hi
I have a script to which I pass multiple arguments, for example lets say the script name is "abc". I run the script like
./abc def /file <directory location>
In the above "def" is the first argument and "/file" is the second argument. I expect <directory location> that is passed after... (4 Replies)
Hi,
I have a script which adds the user credentials to an ldap server. Im passing the variables as below..
/path/my_script $uname $pwd $environ ${deposit}
If i enter some special characters like ';' in $pwd, script returns an error which is set to display if the user enters... (5 Replies)
Is it possible to pass a string as an argument from the command line?
I know I can pass a word in but can I put a line of text in with spaces and fullstops or do I just put it in brackets or quotes so the compiler can differinate between the first argument and the second. (1 Reply)
I'm trying to pass a filename, or all the files in the current directory to the ls command with a script. Unsuccessful so far, here are a few of my attempts:
#!/bin/ksh
read fname
#if (( $# > 0 )); then
$fname | ls -l
#fi
this produces a long listing of all the files in my current... (4 Replies)
