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analyze.py
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analyze.py
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#!/usr/bin/env python2
import frida
import sys
from pwn import log
import json
import os
MODULES = []
FUNCTIONS = []
SCRIPT = """
Interceptor.attach(ptr("{addr}"), {{
onEnter: function(args) {{
send({format});
}}
}});
"""
PATH = ""
def on_message(message, data):
if message['type'] == 'send':
info = json.loads(str(message['payload']).encode('string-escape'),
strict=False)
filename = PATH + info["name"] + ".dat"
with open(filename, "a+") as f:
json.dump(info, f)
f.write("\n")
log.info("stored call to " + info["name"])
else:
log.warning("Could not parse: " + str(message))
def genscript(info, funct):
fstring = '\'{'
fstring += '"name": "{}", '.format(funct.name)
fstring += '"parameters": ['
for p in info["parameters"]:
if p["monitor"]:
fstring += '{'
fstring += '"name": "{}", '.format(p["name"])
fstring += '"content": "\' + '
if(p["type"] == "string"):
fstring += '"\\' + '\\x" + '
fstring += 'Memory.readCString('
fstring += 'args[{}]'.format(info["parameters"].index(p))
fstring += ').split("").map(function(a){return '
fstring += 'a.charCodeAt(0).toString(16)}).join("\\'
fstring += '\\x")'
elif(p["type"] == "num"):
fstring += 'args[{}]'.format(info["parameters"].index(p))
fstring += '.toInt32()'
elif(p["type"] == "addr"):
fstring += 'args[{}]'.format(info["parameters"].index(p))
else:
log.warn("UNKNOWN TYPE IN: " + p)
fstring += ' + \'"}, '
if fstring[-2:] == ', ': # remove ', '
fstring = fstring[:-2]
fstring += ']'
fstring += '}\''
d = {
'addr': funct.absolute_address,
'format': fstring
}
tosend = SCRIPT.format(**d)
return tosend
def main(target):
global PATH
log.info("Going to analyze {}".format(target))
try:
session = frida.get_usb_device().attach(target)
except frida.ServerNotRunningError:
try:
log.error("Please start frida server first")
except:
sys.exit(-1)
except frida.TimedOutError:
try:
log.error("Frida timeout...")
except:
sys.exit(-1)
with open("config/modules.json") as j:
MODULES = json.load(j)
log.info("Will look at: {}".format(', '.join(MODULES)))
PATH = "results/" + sys.argv[1] + "/"
if not os.path.exists(PATH):
os.makedirs(PATH)
runnr = len([x for x in os.listdir(PATH) if os.path.isdir(PATH + x)])
PATH += "run_"
PATH += str(runnr)
PATH += "/"
if not os.path.exists(PATH):
os.makedirs(PATH)
# Get only needed Modules
modules = session.enumerate_modules()
tmp = []
for M in MODULES:
tmp.append(modules[[x.name for x in modules].index(M)])
modules = tmp
functions = []
for x in modules:
functions += x.enumerate_exports()
log.info("Found {} functions".format(len(functions)))
# Which functions do I need to look at?
for filename in os.listdir("functions/"):
with open("functions/" + filename) as j:
FUNCTIONS.append(json.load(j))
lookup = [x["name"] for x in FUNCTIONS]
log.info("Will look for: {}".format(', '.join(lookup)))
for f in lookup:
try:
result = functions[[x.name for x in functions].index(f)]
except ValueError:
log.warn("Function " + f + "not found")
continue
log.info("Found {} in {} @ {}".format(result.name,
result.module.name,
hex(result.absolute_address)
))
script = session.create_script(genscript(FUNCTIONS[lookup.index(f)],
result))
script.on('message', on_message)
script.load()
log.info("Injected all needed scripts, now listening")
sys.stdin.read()
if __name__ == '__main__':
if len(sys.argv) != 2:
try:
log.error("Usage: %s <process name or PID>" % __file__)
except:
sys.exit(-1)
try:
target_process = int(sys.argv[1])
except ValueError:
target_process = sys.argv[1]
main(target_process)