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adwind_string_decoder.py
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adwind_string_decoder.py
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#!/usr/bin/env python
#
# Copyright (C) 2016 JPCERT Coordination Center. All Rights Reserved.
#
# LICENSE
# Please refer to the LICENSE.txt in the https://github.com/JPCERTCC/aa-tools/
#
import re
import sys
import os
import io
import codecs
import zipfile
import tempfile
import subprocess
import shutil
def usage(decoder_py):
for s in [
'Usage:',
' python ' + decoder_py + ' "sample.jar"',
' - output decoded strings to stdout',
'',
' python ' + decoder_py + ' "sample.jar" "output.jasm"',
' - output javap disassembly with decoded strings',
'',
' python ' + decoder_py + ' "sample.jar" "source folder" "output folder"',
' - decode strings in decompiled source files etc.',
' - non-fully qualified method names are not supported.',
'',
'Requirements:',
' javap in JDK (Java Development Kit)',
' python 2.7 or later is recommended for unzip capability',
]:
print(s)
def interpret_key(jasm):
key = {}
func = None
jasm.seek(0)
for line in jasm:
line = line.decode('U8')
if re.match('[pfcs]', line[0]):
jclass = False
for s in line.split():
if jclass:
jclass = s
break
jclass = (s == 'class')
elif re.match(' public static java\.lang\.String .*\(java\.lang\.String\);', line):
func = jclass.replace('.', '/') + '.' + line.split()[-1].split('(')[0] + ':(Ljava/lang/String;)Ljava/lang/String;'
key1 = None
key2 = None
jstack = []
jlocal = [0] * 20
elif func:
op = line.split()
if len(op) < 2:
continue
try:
if op[1] == 'new':
jstack.append([])
elif op[1] == 'newarray':
jstack.pop()
jstack.append([])
elif op[1] == 'invokespecial':
if re.match('java/lang/(Throwable|Exception)\."<init>":\(\)V', op[5]):
jstack.pop()
elif op[5] == 'java/lang/StringBuffer."<init>":(Ljava/lang/String;)V':
key1 = [jstack.pop()]
jstack.pop()
elif op[1] == 'invokevirtual':
if re.match('java/lang/(Throwable|Exception)\.getStackTrace:\(\)\[Ljava/lang/StackTraceElement;', op[5]):
jstack.pop()
jstack.append([])
key2 = []
elif op[5] == 'java/lang/StackTraceElement.getClassName:()Ljava/lang/String;':
jstack.pop()
jstack.append('c')
elif op[5] == 'java/lang/StackTraceElement.getMethodName:()Ljava/lang/String;':
jstack.pop()
jstack.append('m')
elif op[5] == 'java/lang/StringBuffer.append:(Ljava/lang/String;)Ljava/lang/StringBuffer;':
key1.append(jstack.pop())
elif op[5] == 'java/lang/StringBuffer.insert:(ILjava/lang/String;)Ljava/lang/StringBuffer;':
s = jstack.pop()
key1.insert(jstack.pop(), s)
elif op[5] == 'java/lang/String.length:()I':
jstack.pop()
jstack.append(0)
elif op[5] == 'java/lang/String.charAt:(I)C':
jstack.pop()
jstack.pop()
jstack.append(0)
elif op[1] == 'aaload':
jstack.pop()
jstack.pop()
jstack.append([])
elif op[1] == 'isub':
jstack.pop()
jstack.pop()
jstack.append(0)
elif op[1] == 'dup':
jstack.append(jstack[len(jstack) - 1])
elif op[1][:5] == 'dup_x':
jstack.insert(len(jstack) - 1 - int(op[1][5:]), jstack[len(jstack) - 1])
elif op[1] == 'swap':
jstack.append(jstack.pop(len(jstack) - 2))
elif op[1] == 'pop':
jstack.pop()
elif op[1] == 'pop2':
jstack.pop()
jstack.pop()
elif op[1][:6] == 'iconst':
jstack.append(int(op[1].split('_')[1]))
elif op[1] == 'ishl':
i = jstack.pop()
jstack.append(jstack.pop() << i)
elif op[1] == 'ixor':
i = jstack.pop()
jstack.append(jstack.pop() ^ i)
elif op[1][1:6] == 'store':
i = op[1].split('_')
if len(i) >= 2:
i = i[1]
else:
i = op[2]
jlocal[int(i)] = jstack.pop()
elif op[1][1:5] == 'load':
i = op[1].split('_')
if len(i) >= 2:
i = i[1]
else:
i = op[2]
i = jlocal[int(i)]
jstack.append(i)
if op[1][:1] == 'i' and i > 0:
key2.append(i)
elif op[1] == 'castore':
jstack.pop()
jstack.pop()
jstack.pop()
elif re.match('if[egln]', op[1]):
jstack.pop()
elif op[1] == 'areturn':
key[func] = ((key1[0] + key1[1] == 'cm'), key2)
func = None
except:
func = None
return key
def uchr(i):
if sys.version_info[0] < 3:
return unichr(i)
else:
return chr(i)
def decode_utf8(buf):
utf = ''
pos = 0
end = len(buf)
while pos < end:
c = buf[pos]
if ord(c) < 0x80:
utf = utf + c
else:
bytes = 6
while bytes >= 2:
mask = 0x3f00 >> bytes & 0xfc
if ord(c) & mask == mask:
bits = ord(c) & ~mask
for d in buf[pos + 1 : pos + bytes]:
bits = bits << 6 | ord(d) & 0x3f
utf = utf + uchr(bits)
pos = pos + bytes - 1
break
bytes = bytes - 1
pos = pos + 1
return utf
class jasm_str:
def init(self, jclass):
pass
def decode(self, ss, op, jclass):
ss = ss.replace('\\t', '\t')
ss = ss.replace('\\n', '\n')
ss = ss.replace('\\r', '\r')
ss = ss.replace('\\"', '\"')
return ss
class jconst_pool_str(jasm_str):
def __init__(self, jar):
self.jar = zipfile.ZipFile(jar, 'r')
self.cp_utf = {}
self.cp_str = {}
def init(self, jclass):
jb = self.jar.read(jclass.replace('.', '/') + '.class')
jc = jb.decode('L1')
if jc[:4] == b'\xca\xfe\xba\xbe'.decode('L1'):
self.cp_utf[jclass] = {}
self.cp_str[jclass] = {}
pos = 10
idx = 1
cnt = (ord(jc[8]) << 8) + ord(jc[9])
while idx < cnt:
tag = ord(jc[pos])
pos = pos + 1
if tag == 1: #Utf8
end = pos + 2 + (ord(jc[pos]) << 8) + ord(jc[pos + 1])
pos = pos + 2
try:
utf = jb[pos:end].decode('U8')
except UnicodeDecodeError:
utf = decode_utf8(jc[pos:end])
self.cp_utf[jclass][idx] = utf
pos = end
elif tag == 8: #String
self.cp_str[jclass][idx] = (ord(jc[pos]) << 8) + ord(jc[pos + 1])
pos = pos + 2
elif tag == 7 or tag == 16: #Class,MethodType
pos = pos + 2
elif tag == 15: #MethodHandle
pos = pos + 3
elif tag == 3 or tag == 4 or tag == 9 or tag == 10 or tag == 11 or tag == 12 or tag == 18:
pos = pos + 4
elif tag == 5 or tag == 6: #Long,Double
pos = pos + 8
idx = idx + 1
idx = idx + 1
def decode(self, ss, op, jclass):
idx = int(op[2][1:].split(';')[0])
if not idx in self.cp_utf[jclass]:
idx = self.cp_str[jclass][idx]
utf = self.cp_utf[jclass][idx]
return utf
def decode_strings(jasm, key, jstr, out):
cnt = 0
sstack = []
jasm.seek(0)
for line in jasm:
line = line.decode('U8')
end = -1 - (len(line) >=2 and line[-2] == '\r')
func = None
if re.match('[pfcs]', line[0]):
caller_class = False
for s in line.split():
if caller_class:
caller_class = s
jstr.init(caller_class)
break
caller_class = (s == 'class')
elif re.match(' [a-z].*\(.*\).*;', line):
end = line.rindex('(')
pos = line[:end].rindex(' ') + 1
caller_method = line[pos:end]
if caller_method == caller_class:
caller_method = '<init>'
elif line[:end] == ' static {};':
caller_method = '<clinit>'
else:
op = line.split()
if len(op) >= 5:
if op[1][0:3] == 'ldc':
i = line.find('// String ')
if i >= 0:
sstack.append(jstr.decode(line[i + 10 : end], op, caller_class))
if len(sstack) > 20:
del sstack[0]
elif op[1] == 'invokestatic':
func = op[5]
if not '.' in func.split('(')[0]:
func = caller_class.replace('.', '/') + '.' + func
if func[0] == '"':
i = func.rindex('.')
func = func[1 : i - 1] + func[i:]
if func in key:
if key[func][0]:
key1 = caller_class + caller_method
else:
key1 = caller_method + caller_class
key2 = key[func][1]
key1top = len(key1) - 1
key1idx = key1top
key2idx = 0
ss = sstack.pop()
dec = []
for c in reversed(ss):
c = ord(c) ^ ord(key1[key1idx]) ^ key2[key2idx]
c = uchr(c)
dec.insert(0, c)
key1idx = key1idx - key2idx
if key1idx < 0:
key1idx = key1top
key2idx = key2idx + 1 & 1
out.write(line, func, ''.join(dec), ss)
cnt = cnt + 1
else:
func = None
out.write(line, func, None, None);
return cnt
class std_writer:
def write(self, line, func, res, arg):
if res:
print(res)
class line_writer(std_writer):
def __init__(self):
self.num = 1
def write(self, line, func, res, arg):
if res:
print(str(self.num) + '\t' + res)
else:
self.num = self.num + 1
class jasm_writer(std_writer):
def __init__(self, jasm):
self.out = open(jasm, 'wb')
def write(self, line, func, res, arg):
if func:
if res:
res = res.replace('\n', '\\n')
res = res.replace('\r', '\\r')
i = line.index(' // Method')
self.out.write(line[:i].encode('U8'))
self.out.write(' // STRING '.encode('U8'))
self.out.write(res.encode('U8'))
self.out.write(line[i:].encode('U8'))
else:
self.out.write(line.encode('U8'))
class dict_writer(std_writer):
def __init__(self):
self.dic = {}
def write(self, line, func, res, arg):
if res:
i = func.replace(':(Ljava/lang/String;)Ljava/lang/String;', '').replace('/', '.') + '("' + arg + '")'
if i in self.dic and self.dic[i] != res:
raise KeyError(i + ' : ' + self.dic[i] + ' : ' + res)
self.dic[i] = res
def replace_strings(dic, src, dst):
cnt = 0
os.mkdir(dst)
for root, dirs, files in os.walk(src):
for name in dirs:
os.mkdir(dst + os.path.join(root, name)[len(src):])
for name in files:
out = open(dst + os.path.join(root, name)[len(src):], 'wb')
for line in open(os.path.join(root, name), 'rb'):
line = line.decode('U8')
for esc in re.finditer('[a-zA-Z0-9_.\\\\]+?\(".*?[^\\\\](\\\\\\\\)*?"\)', line):
esc = esc.group(0)
raw = esc.encode('U8').decode('unicode_escape')
if raw in dic:
line = line.replace(esc, '"' + dic[raw].encode('unicode_escape').decode('U8').replace('"', '\\"') + '"', 1)
cnt = cnt + 1
out.write(line.encode('U8'))
sys.stderr.write(str(cnt) + ' / ')
def decode_main(argi, jasm):
key = interpret_key(jasm)
i = argi
if len(sys.argv) > i and zipfile.is_zipfile(sys.argv[i]):
jstr = jconst_pool_str(sys.argv[i])
i = i + 1
else:
jstr = jasm_str()
if len(sys.argv) > i + 1 and os.path.isdir(sys.argv[i]) and (os.path.isdir(sys.argv[i + 1]) or not os.path.exists(sys.argv[i + 1])):
out = dict_writer()
cnt = decode_strings(jasm, key, jstr, out)
replace_strings(out.dic, sys.argv[i], sys.argv[i + 1])
elif len(sys.argv) > i:
out = jasm_writer(sys.argv[i])
cnt = decode_strings(jasm, key, jstr, out)
else:
if sys.version_info[0] < 3:
sys.stdout = codecs.getwriter('U8')(sys.stdout)
else:
sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding = 'U8')
if argi == 1:
out = std_writer()
else:
out = line_writer()
cnt = decode_strings(jasm, key, jstr, out)
sys.stderr.write(str(cnt) + ' strings\n')
def main():
if len(sys.argv) < 2:
usage(os.path.basename(sys.argv[0]))
return
if zipfile.is_zipfile(sys.argv[1]):
jar = sys.argv[1]
jdk = os.getenv('JAVA_HOME')
if jdk:
javap = os.path.join(jdk, 'bin', 'javap')
else:
javap = 'javap'
javap = [javap, '-c', '-p', '-J-Dfile.encoding=UTF-8']
jasm = tempfile.TemporaryFile()
try:
dtmp = tempfile.mkdtemp()
jar = zipfile.ZipFile(jar, 'r')
fmt = '{0}.class'
cnt = 0
for i in jar.namelist():
if i.endswith('.class'):
tmp = open(os.path.join(dtmp, fmt.format(cnt)), 'wb')
tmp.write(jar.read(i))
tmp.close()
cnt = cnt + 1
sys.stderr.write(str(cnt) + ' classes ...\n')
subprocess.check_call(javap + [os.path.join(dtmp, fmt.format(i)) for i in range(cnt)], stdout=jasm)
finally:
shutil.rmtree(dtmp)
decode_main(1, jasm)
else:
decode_main(2, open(sys.argv[1], 'rb'))
if __name__ == '__main__':
main()